TIFF images, Working with Color Palette.

Question

I would like to read in a tiff image, change some of the color values and then write out the new file. Is this possible?
Thanks.

Answer 1

Ah dude, that's super-easy.
In JAI there is a call to convert to grayscale, but here is how to remove the red from every pixel in an image:
Assuming you have a BufferedImage called image...
// get image dimensions
int width = image.getWidth();
int height = image.getHeight();
// create pixel array
int pixels = new int[width*height];
// copy data from image into pixel array
pixels = image.getRGB(0,0,width,height,pixels,0,width);
// remove red from entire image
    for (int x=0; x<width; x++)
      for (int y=0; y<height; y++)
        int index = x+y*width;
        int pixel = pixels[index];
        int red   = (pixel & 0xff0000) >> 16; // don't really need this, but whatever
        int green = (pixel & 0xff00)   >> 8;
        int blue  = (pixel & 0xff);
        // Check intensity of pixel for each band
        if (red > tolerance || green > tolerance || blue > tolerance)
          // rebuild pixel with only green and blue values
          pixels[x+y*width] = ( 0xff000000 | (0 << 16) | (green << 8) | blue);
    }There you go!
Who's ya daddy?