How to Perform Simple Partial Coloring of an Image in GIMP

Step-by-Step Guide

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   Step 1: Open a color image in GIMP.

   (Ctrl+D in GIMP) (in Photoshop it is Ctrl + J),, Go to 'Color' drop down menu and select 'Desaturate' >> Average >> OK.
   
   In Photoshop, use "Shift" + "Ctrl" + "U"., Select "Add Layer Mask" option and choose "White (Full Opacity)" and press 'Add' Button., If not, press 'D' to get them., Start coloring the areas on the B&W image, wherever you want it to be in color., Now brush and see what happens for yourself.
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   Step 2: Create a duplicate image of the original color image.

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   Step 3: Name the first image as '1' and the Second Image as '2'.

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   Step 4: Click the first image and desaturate it.

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   Step 5: Right click on the black & white image.

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   Step 6: Make sure you have 'black' on the foreground and 'white' on the background on the color palette.

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   Step 7: Select the 'brush' tool from the 'tool box'.

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   Step 8: Press 'x' button on your keyboard to see the foreground and background colors are being reversed.

Detailed Guide

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