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Java Standard Edition (SE)

BufferedImage


java.awt.image

Class BufferedImage

  • All Implemented Interfaces:
    RenderedImage, WritableRenderedImage, Transparency


    public class BufferedImage
    extends Image
    implements WritableRenderedImage, Transparency
    The BufferedImage subclass describes an Image with an accessible buffer of image data. A BufferedImage is comprised of a ColorModel and a Raster of image data. The number and types of bands in the SampleModel of the Raster must match the number and types required by the ColorModel to represent its color and alpha components. All BufferedImage objects have an upper left corner coordinate of (0, 0). Any Raster used to construct a BufferedImage must therefore have minX=0 and minY=0.

    This class relies on the data fetching and setting methods of Raster, and on the color characterization methods of ColorModel.

    See Also:
    ColorModel, Raster, WritableRaster
    • Field Detail

      • TYPE_CUSTOM

        public static final int TYPE_CUSTOM
        Image type is not recognized so it must be a customized image. This type is only used as a return value for the getType() method.
        See Also:
        Constant Field Values
      • TYPE_INT_RGB

        public static final int TYPE_INT_RGB
        Represents an image with 8-bit RGB color components packed into integer pixels. The image has a DirectColorModel without alpha. When data with non-opaque alpha is stored in an image of this type, the color data must be adjusted to a non-premultiplied form and the alpha discarded, as described in the AlphaComposite documentation.
        See Also:
        Constant Field Values
      • TYPE_INT_ARGB

        public static final int TYPE_INT_ARGB
        Represents an image with 8-bit RGBA color components packed into integer pixels. The image has a DirectColorModel with alpha. The color data in this image is considered not to be premultiplied with alpha. When this type is used as the imageType argument to a BufferedImage constructor, the created image is consistent with images created in the JDK1.1 and earlier releases.
        See Also:
        Constant Field Values
      • TYPE_INT_ARGB_PRE

        public static final int TYPE_INT_ARGB_PRE
        Represents an image with 8-bit RGBA color components packed into integer pixels. The image has a DirectColorModel with alpha. The color data in this image is considered to be premultiplied with alpha.
        See Also:
        Constant Field Values
      • TYPE_INT_BGR

        public static final int TYPE_INT_BGR
        Represents an image with 8-bit RGB color components, corresponding to a Windows- or Solaris- style BGR color model, with the colors Blue, Green, and Red packed into integer pixels. There is no alpha. The image has a DirectColorModel. When data with non-opaque alpha is stored in an image of this type, the color data must be adjusted to a non-premultiplied form and the alpha discarded, as described in the AlphaComposite documentation.
        See Also:
        Constant Field Values
      • TYPE_3BYTE_BGR

        public static final int TYPE_3BYTE_BGR
        Represents an image with 8-bit RGB color components, corresponding to a Windows-style BGR color model) with the colors Blue, Green, and Red stored in 3 bytes. There is no alpha. The image has a ComponentColorModel. When data with non-opaque alpha is stored in an image of this type, the color data must be adjusted to a non-premultiplied form and the alpha discarded, as described in the AlphaComposite documentation.
        See Also:
        Constant Field Values
      • TYPE_4BYTE_ABGR

        public static final int TYPE_4BYTE_ABGR
        Represents an image with 8-bit RGBA color components with the colors Blue, Green, and Red stored in 3 bytes and 1 byte of alpha. The image has a ComponentColorModel with alpha. The color data in this image is considered not to be premultiplied with alpha. The byte data is interleaved in a single byte array in the order A, B, G, R from lower to higher byte addresses within each pixel.
        See Also:
        Constant Field Values
      • TYPE_4BYTE_ABGR_PRE

        public static final int TYPE_4BYTE_ABGR_PRE
        Represents an image with 8-bit RGBA color components with the colors Blue, Green, and Red stored in 3 bytes and 1 byte of alpha. The image has a ComponentColorModel with alpha. The color data in this image is considered to be premultiplied with alpha. The byte data is interleaved in a single byte array in the order A, B, G, R from lower to higher byte addresses within each pixel.
        See Also:
        Constant Field Values
      • TYPE_USHORT_565_RGB

        public static final int TYPE_USHORT_565_RGB
        Represents an image with 5-6-5 RGB color components (5-bits red, 6-bits green, 5-bits blue) with no alpha. This image has a DirectColorModel. When data with non-opaque alpha is stored in an image of this type, the color data must be adjusted to a non-premultiplied form and the alpha discarded, as described in the AlphaComposite documentation.
        See Also:
        Constant Field Values
      • TYPE_USHORT_555_RGB

        public static final int TYPE_USHORT_555_RGB
        Represents an image with 5-5-5 RGB color components (5-bits red, 5-bits green, 5-bits blue) with no alpha. This image has a DirectColorModel. When data with non-opaque alpha is stored in an image of this type, the color data must be adjusted to a non-premultiplied form and the alpha discarded, as described in the AlphaComposite documentation.
        See Also:
        Constant Field Values
      • TYPE_BYTE_GRAY

        public static final int TYPE_BYTE_GRAY
        Represents a unsigned byte grayscale image, non-indexed. This image has a ComponentColorModel with a CS_GRAY ColorSpace. When data with non-opaque alpha is stored in an image of this type, the color data must be adjusted to a non-premultiplied form and the alpha discarded, as described in the AlphaComposite documentation.
        See Also:
        Constant Field Values
      • TYPE_USHORT_GRAY

        public static final int TYPE_USHORT_GRAY
        Represents an unsigned short grayscale image, non-indexed). This image has a ComponentColorModel with a CS_GRAY ColorSpace. When data with non-opaque alpha is stored in an image of this type, the color data must be adjusted to a non-premultiplied form and the alpha discarded, as described in the AlphaComposite documentation.
        See Also:
        Constant Field Values
      • TYPE_BYTE_BINARY

        public static final int TYPE_BYTE_BINARY
        Represents an opaque byte-packed 1, 2, or 4 bit image. The image has an IndexColorModel without alpha. When this type is used as the imageType argument to the BufferedImage constructor that takes an imageType argument but no ColorModel argument, a 1-bit image is created with an IndexColorModel with two colors in the default sRGB ColorSpace: {0, 0, 0} and {255, 255, 255}.

        Images with 2 or 4 bits per pixel may be constructed via the BufferedImage constructor that takes a ColorModel argument by supplying a ColorModel with an appropriate map size.

        Images with 8 bits per pixel should use the image types TYPE_BYTE_INDEXED or TYPE_BYTE_GRAY depending on their ColorModel.

        When color data is stored in an image of this type, the closest color in the colormap is determined by the IndexColorModel and the resulting index is stored. Approximation and loss of alpha or color components can result, depending on the colors in the IndexColorModel colormap.

        See Also:
        Constant Field Values
      • TYPE_BYTE_INDEXED

        public static final int TYPE_BYTE_INDEXED
        Represents an indexed byte image. When this type is used as the imageType argument to the BufferedImage constructor that takes an imageType argument but no ColorModel argument, an IndexColorModel is created with a 256-color 6/6/6 color cube palette with the rest of the colors from 216-255 populated by grayscale values in the default sRGB ColorSpace.

        When color data is stored in an image of this type, the closest color in the colormap is determined by the IndexColorModel and the resulting index is stored. Approximation and loss of alpha or color components can result, depending on the colors in the IndexColorModel colormap.

        See Also:
        Constant Field Values
    • Constructor Detail

      • BufferedImage

        public BufferedImage(int width,
                             int height,
                             int imageType,
                             IndexColorModel cm)
        Constructs a BufferedImage of one of the predefined image types: TYPE_BYTE_BINARY or TYPE_BYTE_INDEXED.

        If the image type is TYPE_BYTE_BINARY, the number of entries in the color model is used to determine whether the image should have 1, 2, or 4 bits per pixel. If the color model has 1 or 2 entries, the image will have 1 bit per pixel. If it has 3 or 4 entries, the image with have 2 bits per pixel. If it has between 5 and 16 entries, the image will have 4 bits per pixel. Otherwise, an IllegalArgumentException will be thrown.

        Parameters:
        width - width of the created image
        height - height of the created image
        imageType - type of the created image
        cm - IndexColorModel of the created image
        Throws:
        IllegalArgumentException - if the imageType is not TYPE_BYTE_BINARY or TYPE_BYTE_INDEXED or if the imageType is TYPE_BYTE_BINARY and the color map has more than 16 entries.
        See Also:
        TYPE_BYTE_BINARY, TYPE_BYTE_INDEXED
      • BufferedImage

        public BufferedImage(ColorModel cm,
                             WritableRaster raster,
                             boolean isRasterPremultiplied,
                             Hashtable<?,?> properties)
        Constructs a new BufferedImage with a specified ColorModel and Raster. If the number and types of bands in the SampleModel of the Raster do not match the number and types required by the ColorModel to represent its color and alpha components, a RasterFormatException is thrown. This method can multiply or divide the color Raster data by alpha to match the alphaPremultiplied state in the ColorModel. Properties for this BufferedImage can be established by passing in a Hashtable of String/Object pairs.
        Parameters:
        cm - ColorModel for the new image
        raster - Raster for the image data
        isRasterPremultiplied - if true, the data in the raster has been premultiplied with alpha.
        properties - Hashtable of String/Object pairs.
        Throws:
        RasterFormatException - if the number and types of bands in the SampleModel of the Raster do not match the number and types required by the ColorModel to represent its color and alpha components.
        IllegalArgumentException - if raster is incompatible with cm
        See Also:
        ColorModel, Raster, WritableRaster
    • Method Detail

      • getAlphaRaster

        public WritableRaster getAlphaRaster()
        Returns a WritableRaster representing the alpha channel for BufferedImage objects with ColorModel objects that support a separate spatial alpha channel, such as ComponentColorModel and DirectColorModel. Returns null if there is no alpha channel associated with the ColorModel in this image. This method assumes that for all ColorModel objects other than IndexColorModel, if the ColorModel supports alpha, there is a separate alpha channel which is stored as the last band of image data. If the image uses an IndexColorModel that has alpha in the lookup table, this method returns null since there is no spatially discrete alpha channel. This method creates a new WritableRaster, but shares the data array.
        Returns:
        a WritableRaster or null if this BufferedImage has no alpha channel associated with its ColorModel.
      • getRGB

        public int getRGB(int x,
                          int y)
        Returns an integer pixel in the default RGB color model (TYPE_INT_ARGB) and default sRGB colorspace. Color conversion takes place if this default model does not match the image ColorModel. There are only 8-bits of precision for each color component in the returned data when using this method.

        An ArrayOutOfBoundsException may be thrown if the coordinates are not in bounds. However, explicit bounds checking is not guaranteed.

        Parameters:
        x - the X coordinate of the pixel from which to get the pixel in the default RGB color model and sRGB color space
        y - the Y coordinate of the pixel from which to get the pixel in the default RGB color model and sRGB color space
        Returns:
        an integer pixel in the default RGB color model and default sRGB colorspace.
        See Also:
        setRGB(int, int, int), setRGB(int, int, int, int, int[], int, int)
      • getRGB

        public int[] getRGB(int startX,
                            int startY,
                            int w,
                            int h,
                            int[] rgbArray,
                            int offset,
                            int scansize)
        Returns an array of integer pixels in the default RGB color model (TYPE_INT_ARGB) and default sRGB color space, from a portion of the image data. Color conversion takes place if the default model does not match the image ColorModel. There are only 8-bits of precision for each color component in the returned data when using this method. With a specified coordinate (x, y) in the image, the ARGB pixel can be accessed in this way:
            pixel   = rgbArray[offset + (y-startY)*scansize + (x-startX)]; 

        An ArrayOutOfBoundsException may be thrown if the region is not in bounds. However, explicit bounds checking is not guaranteed.

        Parameters:
        startX - the starting X coordinate
        startY - the starting Y coordinate
        w - width of region
        h - height of region
        rgbArray - if not null, the rgb pixels are written here
        offset - offset into the rgbArray
        scansize - scanline stride for the rgbArray
        Returns:
        array of RGB pixels.
        See Also:
        setRGB(int, int, int), setRGB(int, int, int, int, int[], int, int)
      • setRGB

        public void setRGB(int x,
                           int y,
                           int rgb)
        Sets a pixel in this BufferedImage to the specified RGB value. The pixel is assumed to be in the default RGB color model, TYPE_INT_ARGB, and default sRGB color space. For images with an IndexColorModel, the index with the nearest color is chosen.

        An ArrayOutOfBoundsException may be thrown if the coordinates are not in bounds. However, explicit bounds checking is not guaranteed.

        Parameters:
        x - the X coordinate of the pixel to set
        y - the Y coordinate of the pixel to set
        rgb - the RGB value
        See Also:
        getRGB(int, int), getRGB(int, int, int, int, int[], int, int)
      • setRGB

        public void setRGB(int startX,
                           int startY,
                           int w,
                           int h,
                           int[] rgbArray,
                           int offset,
                           int scansize)
        Sets an array of integer pixels in the default RGB color model (TYPE_INT_ARGB) and default sRGB color space, into a portion of the image data. Color conversion takes place if the default model does not match the image ColorModel. There are only 8-bits of precision for each color component in the returned data when using this method. With a specified coordinate (x, y) in the this image, the ARGB pixel can be accessed in this way:
            pixel   = rgbArray[offset + (y-startY)*scansize + (x-startX)];
         
        WARNING: No dithering takes place.

        An ArrayOutOfBoundsException may be thrown if the region is not in bounds. However, explicit bounds checking is not guaranteed.

        Parameters:
        startX - the starting X coordinate
        startY - the starting Y coordinate
        w - width of the region
        h - height of the region
        rgbArray - the rgb pixels
        offset - offset into the rgbArray
        scansize - scanline stride for the rgbArray
        See Also:
        getRGB(int, int), getRGB(int, int, int, int, int[], int, int)
      • getWidth

        public int getWidth()
        Returns the width of the BufferedImage.
        Specified by:
        getWidth in interface RenderedImage
        Returns:
        the width of this BufferedImage
      • getHeight

        public int getHeight()
        Returns the height of the BufferedImage.
        Specified by:
        getHeight in interface RenderedImage
        Returns:
        the height of this BufferedImage
      • getProperty

        public Object getProperty(String name,
                                  ImageObserver observer)
        Returns a property of the image by name. Individual property names are defined by the various image formats. If a property is not defined for a particular image, this method returns the UndefinedProperty field. If the properties for this image are not yet known, then this method returns null and the ImageObserver object is notified later. The property name "comment" should be used to store an optional comment that can be presented to the user as a description of the image, its source, or its author.
        Specified by:
        getProperty in class Image
        Parameters:
        name - the property name
        observer - the ImageObserver that receives notification regarding image information
        Returns:
        an Object that is the property referred to by the specified name or null if the properties of this image are not yet known.
        Throws:
        NullPointerException - if the property name is null.
        See Also:
        ImageObserver, Image.UndefinedProperty
      • createGraphics

        public Graphics2D createGraphics()
        Creates a Graphics2D, which can be used to draw into this BufferedImage.
        Returns:
        a Graphics2D, used for drawing into this image.
      • getSubimage

        public BufferedImage getSubimage(int x,
                                         int y,
                                         int w,
                                         int h)
        Returns a subimage defined by a specified rectangular region. The returned BufferedImage shares the same data array as the original image.
        Parameters:
        x - the X coordinate of the upper-left corner of the specified rectangular region
        y - the Y coordinate of the upper-left corner of the specified rectangular region
        w - the width of the specified rectangular region
        h - the height of the specified rectangular region
        Returns:
        a BufferedImage that is the subimage of this BufferedImage.
        Throws:
        RasterFormatException - if the specified area is not contained within this BufferedImage.
      • isAlphaPremultiplied

        public boolean isAlphaPremultiplied()
        Returns whether or not the alpha has been premultiplied. It returns false if there is no alpha.
        Returns:
        true if the alpha has been premultiplied; false otherwise.
      • coerceData

        public void coerceData(boolean isAlphaPremultiplied)
        Forces the data to match the state specified in the isAlphaPremultiplied variable. It may multiply or divide the color raster data by alpha, or do nothing if the data is in the correct state.
        Parameters:
        isAlphaPremultiplied - true if the alpha has been premultiplied; false otherwise.
      • toString

        public String toString()
        Returns a String representation of this BufferedImage object and its values.
        Overrides:
        toString in class Object
        Returns:
        a String representing this BufferedImage.
      • getSources

        public Vector<RenderedImage> getSources()
        Returns a Vector of RenderedImage objects that are the immediate sources, not the sources of these immediate sources, of image data for this BufferedImage. This method returns null if the BufferedImage has no information about its immediate sources. It returns an empty Vector if the BufferedImage has no immediate sources.
        Specified by:
        getSources in interface RenderedImage
        Returns:
        a Vector containing immediate sources of this BufferedImage object's image date, or null if this BufferedImage has no information about its immediate sources, or an empty Vector if this BufferedImage has no immediate sources.
      • getPropertyNames

        public String[] getPropertyNames()
        Returns an array of names recognized by getProperty(String) or null, if no property names are recognized.
        Specified by:
        getPropertyNames in interface RenderedImage
        Returns:
        a String array containing all of the property names that getProperty(String) recognizes; or null if no property names are recognized.
      • getMinX

        public int getMinX()
        Returns the minimum x coordinate of this BufferedImage. This is always zero.
        Specified by:
        getMinX in interface RenderedImage
        Returns:
        the minimum x coordinate of this BufferedImage.
      • getMinY

        public int getMinY()
        Returns the minimum y coordinate of this BufferedImage. This is always zero.
        Specified by:
        getMinY in interface RenderedImage
        Returns:
        the minimum y coordinate of this BufferedImage.
      • getSampleModel

        public SampleModel getSampleModel()
        Returns the SampleModel associated with this BufferedImage.
        Specified by:
        getSampleModel in interface RenderedImage
        Returns:
        the SampleModel of this BufferedImage.
      • getNumXTiles

        public int getNumXTiles()
        Returns the number of tiles in the x direction. This is always one.
        Specified by:
        getNumXTiles in interface RenderedImage
        Returns:
        the number of tiles in the x direction.
      • getNumYTiles

        public int getNumYTiles()
        Returns the number of tiles in the y direction. This is always one.
        Specified by:
        getNumYTiles in interface RenderedImage
        Returns:
        the number of tiles in the y direction.
      • getMinTileX

        public int getMinTileX()
        Returns the minimum tile index in the x direction. This is always zero.
        Specified by:
        getMinTileX in interface RenderedImage
        Returns:
        the minimum tile index in the x direction.
      • getMinTileY

        public int getMinTileY()
        Returns the minimum tile index in the y direction. This is always zero.
        Specified by:
        getMinTileY in interface RenderedImage
        Returns:
        the minimum tile index in the y direction.
      • getTileWidth

        public int getTileWidth()
        Returns the tile width in pixels.
        Specified by:
        getTileWidth in interface RenderedImage
        Returns:
        the tile width in pixels.
      • getTileHeight

        public int getTileHeight()
        Returns the tile height in pixels.
        Specified by:
        getTileHeight in interface RenderedImage
        Returns:
        the tile height in pixels.
      • getTileGridXOffset

        public int getTileGridXOffset()
        Returns the x offset of the tile grid relative to the origin, For example, the x coordinate of the location of tile (0, 0). This is always zero.
        Specified by:
        getTileGridXOffset in interface RenderedImage
        Returns:
        the x offset of the tile grid.
      • getTileGridYOffset

        public int getTileGridYOffset()
        Returns the y offset of the tile grid relative to the origin, For example, the y coordinate of the location of tile (0, 0). This is always zero.
        Specified by:
        getTileGridYOffset in interface RenderedImage
        Returns:
        the y offset of the tile grid.
      • getTile

        public Raster getTile(int tileX,
                              int tileY)
        Returns tile (tileXtileY). Note that tileX and tileY are indices into the tile array, not pixel locations. The Raster that is returned is live, which means that it is updated if the image is changed.
        Specified by:
        getTile in interface RenderedImage
        Parameters:
        tileX - the x index of the requested tile in the tile array
        tileY - the y index of the requested tile in the tile array
        Returns:
        a Raster that is the tile defined by the arguments tileX and tileY.
        Throws:
        ArrayIndexOutOfBoundsException - if both tileX and tileY are not equal to 0
      • getData

        public Raster getData()
        Returns the image as one large tile. The Raster returned is a copy of the image data is not updated if the image is changed.
        Specified by:
        getData in interface RenderedImage
        Returns:
        a Raster that is a copy of the image data.
        See Also:
        setData(Raster)
      • getData

        public Raster getData(Rectangle rect)
        Computes and returns an arbitrary region of the BufferedImage. The Raster returned is a copy of the image data and is not updated if the image is changed.
        Specified by:
        getData in interface RenderedImage
        Parameters:
        rect - the region of the BufferedImage to be returned.
        Returns:
        a Raster that is a copy of the image data of the specified region of the BufferedImage
        See Also:
        setData(Raster)
      • copyData

        public WritableRaster copyData(WritableRaster outRaster)
        Computes an arbitrary rectangular region of the BufferedImage and copies it into a specified WritableRaster. The region to be computed is determined from the bounds of the specified WritableRaster. The specified WritableRaster must have a SampleModel that is compatible with this image. If outRaster is null, an appropriate WritableRaster is created.
        Specified by:
        copyData in interface RenderedImage
        Parameters:
        outRaster - a WritableRaster to hold the returned part of the image, or null
        Returns:
        a reference to the supplied or created WritableRaster.
      • setData

        public void setData(Raster r)
        Sets a rectangular region of the image to the contents of the specified Raster r, which is assumed to be in the same coordinate space as the BufferedImage. The operation is clipped to the bounds of the BufferedImage.
        Specified by:
        setData in interface WritableRenderedImage
        Parameters:
        r - the specified Raster
        See Also:
        getData(), getData(Rectangle)
      • removeTileObserver

        public void removeTileObserver(TileObserver to)
        Removes a tile observer. If the observer was not registered, nothing happens. If the observer was registered for multiple notifications, it is now registered for one fewer notification.
        Specified by:
        removeTileObserver in interface WritableRenderedImage
        Parameters:
        to - the specified TileObserver.
      • isTileWritable

        public boolean isTileWritable(int tileX,
                                      int tileY)
        Returns whether or not a tile is currently checked out for writing.
        Specified by:
        isTileWritable in interface WritableRenderedImage
        Parameters:
        tileX - the x index of the tile.
        tileY - the y index of the tile.
        Returns:
        true if the tile specified by the specified indices is checked out for writing; false otherwise.
        Throws:
        ArrayIndexOutOfBoundsException - if both tileX and tileY are not equal to 0
      • getWritableTileIndices

        public Point[] getWritableTileIndices()
        Returns an array of Point objects indicating which tiles are checked out for writing. Returns null if none are checked out.
        Specified by:
        getWritableTileIndices in interface WritableRenderedImage
        Returns:
        a Point array that indicates the tiles that are checked out for writing, or null if no tiles are checked out for writing.
      • hasTileWriters

        public boolean hasTileWriters()
        Returns whether or not any tile is checked out for writing. Semantically equivalent to
         (getWritableTileIndices() != null).
         
        Specified by:
        hasTileWriters in interface WritableRenderedImage
        Returns:
        true if any tile is checked out for writing; false otherwise.
      • getWritableTile

        public WritableRaster getWritableTile(int tileX,
                                              int tileY)
        Checks out a tile for writing. All registered TileObservers are notified when a tile goes from having no writers to having one writer.
        Specified by:
        getWritableTile in interface WritableRenderedImage
        Parameters:
        tileX - the x index of the tile
        tileY - the y index of the tile
        Returns:
        a WritableRaster that is the tile, indicated by the specified indices, to be checked out for writing.
      • releaseWritableTile

        public void releaseWritableTile(int tileX,
                                        int tileY)
        Relinquishes permission to write to a tile. If the caller continues to write to the tile, the results are undefined. Calls to this method should only appear in matching pairs with calls to getWritableTile(int, int). Any other leads to undefined results. All registered TileObservers are notified when a tile goes from having one writer to having no writers.
        Specified by:
        releaseWritableTile in interface WritableRenderedImage
        Parameters:
        tileX - the x index of the tile
        tileY - the y index of the tile


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