[Image-SIG] PIL - representing shades of colors in a linear way

[Eduardo Ismael]

Is it possible to represent all the RGB different colors in a linear way, instead of by a tuple (R, G, B)?

I am asking because I want to delete all shades of blue in an image, like (0, 0, 255) and (51, 0, 255), for example. The problem is that if I set a range using < and >, (see below) it is going to affect other colors in between, like (51, 0, 0), which is far from being blue. here is the code that is not working properly:

for x in range(width):
        for y in range(height):
            if pixels[x, y] >= (0, 0, 255):
                if pixels[x, y] <= (51, 0, 255):
                    pixels[x, y] = (255, 255, 255)

If I could represent all the shades of a particular color in a linear way, then using < and > would work. Also, the images I am working with were scanned so that's the reason way the pixels don't have an even color. I am open to other solutions as well.

Thanks,

Eduardo



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