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3

This what the selection tools are for. For instance you use the lasso tool to draw a polygon around the face, add some feathering (Select>Feather or use the tools' feathering option), and then do the color changes (hat will only apply to the selection area).


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Layer > New Layer or Shift+Ctrl+N (make sure it's transparent obviously) Select > All or Ctrl+A selects the entire layer. Or if you want to load a shape drawn on a transparent layer as a selection, right click the layer in the layers panel and choose Alpha to Selection. Obviously you will then have to select the transparent layer again before ...


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You can try a Displace map. Grey pixels in the map don't move, dark pixels move to one side, light pixels move to the other. By using a black-to-white gradient where the grey is on the middle of the can you can stretch the extremities more than the center: You can use Curves to give your gradient more effect on the sides: But getting the original flat ...


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A good way to demonstrate the problem is to blur a ring without a selection. With Gimp's Gaussian blur the result is slightly diamond-shaped: There is a very powerful collection of filters available for Gimp called GMIC. It features (among many other things) a Gaussian blur filter that doesn't seem to suffer from the problem (at least not to the same extent)...


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The answer turned out to be blindingly simple: Just select the layer and then apply the filter. I did try that before asking, but for some unknown reason it didn't work at first. In the end, however, it did.


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If your image is in grayscale or color-indexed mode (see the title bar), anything you add to it (cut/paste, or Open as layers) is coerced into its current mode (for grayscale: desaturated, for color-indexed: converted to the closest colors in the colormap). You can restore full color support in your image by putting in it "RGB" mode: Image>...


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Use a different method instead. Use the Clone Tool. Select the Clone Tool, choose a small soft edged brush Ctrl+click to select the clone source from a different part of the bag Carefully paint over a small part of the finger repeat steps 2 and 3 until you have finished Example


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Such transforms are mathematically difficult to define. If your transform is a sine/cosine law, you can use the filters that project your layer to a cylinder (Filters>Map>Map object and map to cylinder). For an arbitrary transform, possibly using a displace map, but the actual map may be difficult to come up with: To create the displace map (#2): ...


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There's in the basic GIMP configuration filter Distort > Spherize. In horizontal mode it deforms your image like it was used as a bottle label. It's definitely non-linear but you have only a little control. A custom math transformation would be better. It's discussed at the end of this answer. Unfortunately the sparsest area is in the middle, not in the ...


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I assume that after "Channel to selection" you bucket-filled the selection with I white on a black layer. On Gimp 2.8 the behavior is as you expect(*). 2.8 works all over with 8-bit gamma-corrected values (so that there are more values to describe the dark tones). In 2.10 things are different. Internally all computation is done in floating-point, ...


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There's no need to make a selection first. Change the Threshold slider in the tool options until you get the desired result. Also you appeat to have an old version of GIMP. Perhaps consider upgrading to a more recent version if you want this functionality. Example in GIMP 2.10.18


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Selection by color isn't sharp because at the edge the color often changes gradually. You must bite the bullet and draw a path around your shape. It makes as sharp selection as your photo allows. There's plenty of tutorials available like this: https://www.youtube.com/watch?v=SqUineYZmpA BTW I have made numerous selections in photos to extract items and ...


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