We can also do other weird and wonderful things with layers. Have a look see what is on each of the layers. We can turn whole layers on and off by clicking the "eye" icon next to them in the layers box. None of this work is destructive, we have not taken anything away from the original image and we can go in and edit the masks or layers any time we want. You should now have an image that is mostly black and white with only what you painted showing through as colour. If you want to actually edit the layer you can right click the layer and uncheck "Edit Layer Mask", if you later want to come back and mess with the mask, just recheck "Edit Layer Mask"ĩ. When you add a mask by default you will be in edit mask mode. Notice how our paint affected the mask only and not the layer itself, nothing actually went black or white it just became visible or invisible. Tidy up any spilt paint by painting white over the top of it. Pick whatever brush shape and size suits you best and start painting your subject. press P (or the paint tool), make sure you have the color set to black (hint first of the 2 large squares under the tool icons is the foreground colour). We can now paint our target black, don't worry if you paint to much as instead of hitting undo, you can just change the paint color to white and tidy it up. Gimp then puts a mask over the layer that is all white to start with. What this does is it tells gimp, that everything you paint black you want to be transparent, and white is not transparent. Right click the black and white layer and choose "Add Layer Mask" then choose "White (full opacity)" and click "Add". Instead we will use a Layer Mask, quite simple this is a companion to the layer, that we can work on and go back and edit any time we want. Lets undo our erase (CTRL+Z or Edit > undo)Ĩ. Actually no, lets not do that, it would be slow and tedious especially when working around edges, and what if we change our mind later on what we want in colour? We would have to start again, it would work but its not smart. Right click on the Black and White layer and choose "Add Alpha Channel", nothing visual will happen, but try erase just a simple line again and you will see that now we can see through this layer to the colour one underneat, now to do our selective colour image with one thing in colour the rest in black and white we could keep erasing a hole in the black and white layer. Images that come out of cameras are not transparent normally, but thats easily fixed. Lets undo this mistake hit CTRL+Z or press Edit > Undo.ħ. Effectively what we have done is strip the ink or paint off the layer, we can see the paper but the paper is not transparent. It won't work you will just get a white line (or whatever colour is the background colour). click the eraser tool (or press SHIFT+E) and try erase a line on the object you want to be in colour. Wouldn't it be cool if we could leave the B+W on top but cut a hole in it and see through to the color version? Lets try it with the eraser tool first. You could put the colour on top, or the black and white on top (we only have 2 layers, lets leave the B+W on top)Ħ. If you wanted to, you can change the order of the layers using the up/down buttons in the layer box. Imagine you printed 2 images one in B+W the other Colour, and the B+W is sitting on top, this is the same situation you have here. Your whole image should be black and white now, you still have a color version, but it is covered by the Black and white version as the black any white layer is on top. I choose luminosity for my image, and hit ok.ĥ. Click Colors > Desaturate, choose whichever of the 3 options looks best to you the image will update as you change the options so you will see what the result will be, before you click OK. I vote we change the layer called "Black and white" so make sure it is selected in the layers dialog box, when working with layers its important to forget what is displayed as its may not be the selected layer.Ĥ. We should probably make one of them Black and white. So now we have two layers with different names. While you are at it rename the Background layer to colour (or Color if you in the USA)ģ. Double click the text "background copy" and type in "Black and White". Right click the Background Layer and choose "Duplicate Layer" or press ctrl+shift+D, you should now have a layer called background copy, lets give it another name, like black and white. We will do a selective colour practical example to show how layers and masks work, see the attached image below if you don't know what a selective colour is.Ģ. GIMP Layers/Masks - Black and White, Selective Colour
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