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I just finished pset3, so now I'm starting on pset4, and I'm not quite sure how to start whodunit? I think you should copy the clue (I'm not sure where to copy it to though) and iterate over each of the pixels one at a time, and if a pixel is red, turn it into white? I'm also not sure where I am actually supposed to be writing the code and how to start writing it. Thanks

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Start with the clue.c code which copies the image from input to output:

Whodunit.c should transform the imput image. Instead of copying each pixel, it should make some modifications.

./whodunit clue.bmp verdict.bmp

Each pixel has Red, Green and Blue values that range from 0x00 to 0xFF. There's no one way to solve the problem - basically just try a few things. For instance, you can remove all of the green from a pixel with:

RGBTRIPLE triple;
fread(&triple, sizeof(RGBTRIPLE), 1, inptr);
triple.rgbtGreen = 0;
fwrite(&triple, sizeof(RGBTRIPLE), 1, outptr);

You can also test pixel colors before changing them:

if (triple.rgbtGreen == ??) {
    triple.rgbtGreen = ??;
}

This problem requires a bit of guessing and checking. Try different combinations of operations. It may also help to think about what the combinations of Red, Green and Blue actually do.

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