Package org.apache.fop.util.bitmap

Class BitmapImageUtil

java.lang.Object
org.apache.fop.util.bitmap.BitmapImageUtil
public final class BitmapImageUtil extends Object
Utility method for dealing with bitmap images.

  • Method Details

    • isMonochromeImage

      public static boolean isMonochromeImage(RenderedImage img)
      Indicates whether an image is a monochrome (1 bit black and white) image.
      Parameters:
      img - the image
      Returns:
      true if it's a monochrome image

    • isZeroBlack

      public static boolean isZeroBlack(RenderedImage img)
      Indicates whether a zero bit indicates a black/dark pixel for a monochrome image.
      Parameters:
      img - the image (must be 1 bit monochrome)
      Returns:
      true if a zero bit indicates a black/dark pixel, false for a white/bright pixel

    • convertToGray

      public static int convertToGray(int r, int g, int b)
      Convert an RGB color value to a grayscale from 0 to 100.
      Parameters:
      r - the red component
      g - the green component
      b - the blue component
      Returns:
      the gray value

    • convertToGray

      public static int convertToGray(int rgb)
      Convert an RGB color value to a grayscale from 0 to 100.
      Parameters:
      rgb - the RGB value
      Returns:
      the gray value

    • getColorIndexSize

      public static int getColorIndexSize(RenderedImage img)
      Returns the size of the color index if the given image has one.
      Parameters:
      img - the image
      Returns:
      the size of the color index or 0 if there's no color index

    • isGrayscaleImage

      public static boolean isGrayscaleImage(RenderedImage img)
      Indicates whether an image is a grayscale image.
      Parameters:
      img - the image
      Returns:
      true if it's a grayscale image

    • convertTosRGB

      public static BufferedImage convertTosRGB(RenderedImage img, Dimension targetDimension)
      Converts an image to sRGB. Optionally, the image can be scaled.
      Parameters:
      img - the image to be converted
      targetDimension - the new target dimensions or null if no scaling is necessary
      Returns:
      the sRGB image

    • convertToGrayscale

      public static BufferedImage convertToGrayscale(RenderedImage img, Dimension targetDimension)
      Converts an image to a grayscale (8 bits) image. Optionally, the image can be scaled.
      Parameters:
      img - the image to be converted
      targetDimension - the new target dimensions or null if no scaling is necessary
      Returns:
      the grayscale image

    • convertToMonochrome

      public static BufferedImage convertToMonochrome(RenderedImage img, Dimension targetDimension)
      Converts an image to a monochrome 1-bit image. Optionally, the image can be scaled.
      Parameters:
      img - the image to be converted
      targetDimension - the new target dimensions or null if no scaling is necessary
      Returns:
      the monochrome image

    • convertToMonochrome

      public static RenderedImage convertToMonochrome(RenderedImage img, Dimension targetDimension, float quality)
      Converts an image to a monochrome 1-bit image. Optionally, the image can be scaled.
      Parameters:
      img - the image to be converted
      targetDimension - the new target dimensions or null if no scaling is necessary
      quality - Defines the desired quality level for the conversion. Valid values: a value between 0.0f (fastest) and 1.0f (best)
      Returns:
      the monochrome image

    • toBufferedImage

      public static BufferedImage toBufferedImage(RenderedImage img)
      Returns a BufferedImage based on the given RenderedImage. In the easiest case, this is a simple typecast. Otherwise, the image is converted to a BufferedImage.
      Parameters:
      img - the original image
      Returns:
      the buffered image

    • createDefaultMonochromeBitmapConverter

      public static MonochromeBitmapConverter createDefaultMonochromeBitmapConverter()
      Returns:
      the bitmap converter