Creating an industrial-style wallpaper (with GIMP)

"The aim of this step is to get a very nice high contrast black/white image of the cranes on my photo. We can do that using:

"- Colors / Components / Channel mixer

"We want to get a white background (which will be easily removed later), while our cranes on the picture shall be almost dark gray and black.

"First I checked "Monochrome" in the channel mixer. Next step is to play around with the red/green/blue channel values so that you get a walmost white background. The sky shall be white, and because it is blue in the original image I raise the values of the Blue channel until it is completely white."

Complete Story

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