org.jpedal.io
Class ColorSpaceConvertor

java.lang.Object
  org.jpedal.io.ColorSpaceConvertor

public class ColorSpaceConvertor
extends java.lang.Object

set of static methods to save/load objects to convert images between different colorspaces - Several methods are very similar and I should recode my code to use a common method for the RGB conversion LogWriter is JPedal logging class

Field Summary

static boolean

isUsingARGB Flag to trigger raster printing

Constructor Summary

ColorSpaceConvertor()

Method Summary

static java.awt.image.BufferedImage	algorithmicConvertCMYKImageToRGB(byte[] buffer, int w, int h) save raw CMYK data by converting to RGB using algorithm method - pdfsages supplied the C source and I have converted - This works very well on most colours but not dark shades which are all rolled into black This is what xpdf seems to use - Note we store the output data in our input queue to reduce memory usage - we have seen raw 2000 * 2000 images and having input and output buffers is a LOT of memory - I have kept the doubles in as I just rewrote Leonard's code - I haven't really looked at optimisation beyond memory issues
static java.awt.image.BufferedImage	algorithmicConvertYCbCrToRGB(byte[] buffer, int w, int h) convert YCbCr to RGB using formula
static java.awt.image.BufferedImage	convertColorspace(java.awt.image.BufferedImage image, int newType) convert a BufferedImage to RGB colourspace
static java.awt.image.BufferedImage	convertFromICCCMYK(int width, int height, byte[] data) slightly contrived but very effective way to convert to RGB
static java.awt.image.BufferedImage	convertIndexedToFlat(int d, int w, int h, byte[] data, byte[] index, boolean isARGB, boolean isDownsampled)
static java.awt.image.BufferedImage	convertToARGB(java.awt.image.BufferedImage image) convert a BufferedImage to RGB colourspace (used when I clip the image)
static java.awt.image.BufferedImage	convertToRGB(java.awt.image.BufferedImage image) convert any BufferedImage to RGB colourspace
static java.awt.image.WritableRaster	createCompatibleWritableRaaster(java.awt.image.ColorModel colorModel, int w, int h)
static java.awt.image.Raster	createInterleavedRaster(byte[] data, int w, int h)
static void	drawImage(java.awt.Graphics2D g2, java.awt.image.BufferedImage tileImg, java.awt.geom.AffineTransform tileAff, java.awt.image.ImageObserver observer)
static java.awt.image.BufferedImage	iccConvertCMYKImageToRGB(byte[] buffer, int w, int h) convert YCC to CMY via formula and the CMYK to sRGB via profiles

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

isUsingARGB

public static boolean isUsingARGB

Flag to trigger raster printing

Constructor Detail

ColorSpaceConvertor

public ColorSpaceConvertor()

Method Detail

convertFromICCCMYK

public static java.awt.image.BufferedImage convertFromICCCMYK(int width,
                                                              int height,
                                                              byte[] data)

slightly contrived but very effective way to convert to RGB

convertToRGB

public static java.awt.image.BufferedImage convertToRGB(java.awt.image.BufferedImage image)

convert any BufferedImage to RGB colourspace

convertToARGB

public static java.awt.image.BufferedImage convertToARGB(java.awt.image.BufferedImage image)

convert a BufferedImage to RGB colourspace (used when I clip the image)

algorithmicConvertCMYKImageToRGB

public static java.awt.image.BufferedImage algorithmicConvertCMYKImageToRGB(byte[] buffer,
                                                                            int w,
                                                                            int h)

save raw CMYK data by converting to RGB using algorithm method - pdfsages supplied the C source and I have converted - This works very well on most colours but not dark shades which are all rolled into black This is what xpdf seems to use - Note we store the output data in our input queue to reduce memory usage - we have seen raw 2000 * 2000 images and having input and output buffers is a LOT of memory - I have kept the doubles in as I just rewrote Leonard's code - I haven't really looked at optimisation beyond memory issues

algorithmicConvertYCbCrToRGB

public static java.awt.image.BufferedImage algorithmicConvertYCbCrToRGB(byte[] buffer,
                                                                        int w,
                                                                        int h)

convert YCbCr to RGB using formula

convertIndexedToFlat

public static java.awt.image.BufferedImage convertIndexedToFlat(int d,
                                                                int w,
                                                                int h,
                                                                byte[] data,
                                                                byte[] index,
                                                                boolean isARGB,
                                                                boolean isDownsampled)

iccConvertCMYKImageToRGB

public static java.awt.image.BufferedImage iccConvertCMYKImageToRGB(byte[] buffer,
                                                                    int w,
                                                                    int h)
                                                             throws java.io.IOException

convert YCC to CMY via formula and the CMYK to sRGB via profiles

Throws:

java.io.IOException

convertColorspace

public static java.awt.image.BufferedImage convertColorspace(java.awt.image.BufferedImage image,
                                                             int newType)

convert a BufferedImage to RGB colourspace

createCompatibleWritableRaaster

public static java.awt.image.WritableRaster createCompatibleWritableRaaster(java.awt.image.ColorModel colorModel,
                                                                            int w,
                                                                            int h)

createInterleavedRaster

public static java.awt.image.Raster createInterleavedRaster(byte[] data,
                                                            int w,
                                                            int h)

drawImage

public static void drawImage(java.awt.Graphics2D g2,
                             java.awt.image.BufferedImage tileImg,
                             java.awt.geom.AffineTransform tileAff,
                             java.awt.image.ImageObserver observer)