How to edit a color out in GIMP?

Question

I sketched a picture on paper in red ink and went over it "perfectly" in blue ink.
I have scanned the picture and loaded onto GIMP but can not (for the life of me) get rid of the red ink.

[ by get "rid of," I mean not to see any red/any of my sketch lines in the finished product. I initially thought that if I clicked the "red channel" off, the red would be gone but I can see that isn't the case so that's why I'm lost as to what to do :/ ]

Answer 1

I tried my best and I managed to get this by turning your image into a grayscale and then messing with levels: http://i285.photobucket.com/albums/ll46/Kinuika/ara1025.png?t=1311795535



Pandabaka's tutorial is great but she uses a non-photo blue pencil for her sketch which means that most if not all her blue lines turn in to a extremely light shade of grey when she turns her image into a grayscale image. Next time I suggest sketching in a lighter color and then going over your lines in black ink (you can change the color later in gimp) to get cleaner lines :)

I hope this helps and feel free to contact me if you need more help!

Answer 2

You could try this: Click Colours > Colourise, adjust the hue slider until it looks the proper shade of blue.



This won't actually get rid of the red, it will just make everything blue. Actually erasing the red will be difficult, I guess you could try over painting the red parts with white - but that will be time consuming.



Another way to do it would be to use: Colours > Hue-Saturation. Click the red selector - increase the lightness slider to it's maximum - click OK. Repeat the whole thing over and over again until the red fades away.



Not sure why you felt the need to overlay your drawing with blue ink, when you could have just changed the colour of the red sketch in GIMP to blue using Colourise. Also if you do something like this in the future, do your initial sketch in pencil, then ink it, then use an eraser to remove the pencil lines. It's much simpler.

Answer 3

dear yes we can use gimp. GIMp is an image manipulation program similar to Photoshop. The advantage of using GIMP is that it's completely free to download and use, one of the easiest ways produces great results. Open up GIMP on your computer, and proceed to open up the photo you wish to modify. Select the scissors tool from your Tool palette or by clicking "Tools" on the menu bar, at "Selection Tools," then "Intelligent Scissors. Use this tool to outline the person's hair in the photo by clicking along the hairline at about ½-inch intervals until you return to the first place you clicked. Click in the center of the selection you just completed, and the outline Hold "Ctrl" on your keyboard and select "C" for copy. Then hold "Ctrl" again and select "V" for paste. In your "Layers" palette, you should now have a new layer that says "Floating Selection (Pasted Layer)." Right-click on that layer and then select "New Layer." You should now have a layer that consists exclusively of the person's hair. Make sure that the new layer is selected for the next step. Click on the "Colors" option in the menu bar, and then select "Hue-Saturation.and modify the color, lightness and saturation of the layer. Move the "Hue" bar by clicking and dragging it back and forth until you find the desired hair color. Click "OK" once you've found the desired color.