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TMI-JPEG: Better CMYK to RGB algorithm

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Harald Kuhr 2013-06-05 10:49:37 +02:00
parent 28e2f3c21b
commit f8c40a3748
1 changed files with 5 additions and 4 deletions
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9
imageio/imageio-jpeg/src/main/java/com/twelvemonkeys/imageio/plugins/jpeg/FastCMYKToRGB.java
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@ -131,11 +131,12 @@ class FastCMYKToRGB implements /*BufferedImageOp,*/ RasterOp {
return dest; return dest;
} }
@SuppressWarnings({"PointlessArithmeticExpression"})
private void convertCMYKToRGB(byte[] cmyk, byte[] rgb) { private void convertCMYKToRGB(byte[] cmyk, byte[] rgb) {
rgb[0] = (byte) (((255 - cmyk[0] & 0xFF) * (255 - cmyk[3] & 0xFF)) / 255); // Adapted from http://www.easyrgb.com/index.php?X=MATH
rgb[1] = (byte) (((255 - cmyk[1] & 0xFF) * (255 - cmyk[3] & 0xFF)) / 255); final int k = cmyk[3] & 0xFF;
rgb[2] = (byte) (((255 - cmyk[2] & 0xFF) * (255 - cmyk[3] & 0xFF)) / 255); rgb[0] = (byte) (255 - (((cmyk[0] & 0xFF) * (255 - k) / 255) + k));
rgb[1] = (byte) (255 - (((cmyk[1] & 0xFF) * (255 - k) / 255) + k));
rgb[2] = (byte) (255 - (((cmyk[2] & 0xFF) * (255 - k) / 255) + k));
} }
public Rectangle2D getBounds2D(Raster src) { public Rectangle2D getBounds2D(Raster src) {