Hexillology

For this one open the image in gimp select color picker. Also open the color section in windows/dockable dialogs/colors then click on each section and note down the hex color values: 746a63 74667b 63306c 6f7266 75315f 666c34 67217d decode this from hex and we get the flag:

tjctf{c0lorfu1_fl4g!}

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