![]() ![]() But don't add too many duplicate layers, because even after the middle area reaches complete opacity, the outside pixels will continue adding to themselves with each new duplicate layer, until they eventually become completely opaque themselves (and you will lose the "feathered" or "anti-aliased" appearance at the edges).Since the pixels around the outside edge were originally less opaque than the pixels in the middle, the outside pixels will add to themselves less than the more opaque pixels in the middle.Ĭreate additional duplicates of the original layer until the middle area reaches the desired opacity.If so, one way is to duplicate the original layer on top of itself, so that each partially transparent pixel adds to itself proportionally. So instead so using the Dog image as the top layer, I created a layer with pure red, ff0000.If I understand the question, you are starting with a colored area that is partially transparent throughout, but at the outside edges it gradually becomes completely transparent (so the edges appear "feathered" or "anti-aliased") and you want to make the colored area completely opaque, except for the outside edges, which you still want to gradually become completely transparent, in the same proportion to their original transparency (to retain a similar "feathered" or "anti-aliased" appearance at the edges)? Then I had the idea that using one image to erase colors on the other one was making it too complicated for seeing what is going on. A precise color match would, at the very least, mean the 6 hexadecimal digits for the RGB match precisely, otherwise nothing is erased. 4 channels at 8 bits each gives you 32 bits, so we call these 32-bit color. 16 x 16 = 256, and we know that it is handled in binary mathematics by one 8-bit byte. ![]() Recall that digital images are defined by numbers that express the Red, Green, Blue, and Alpha, and each number is composed of two hexadecimal digits. I think there is something going on involving the numbers here. I don’t think it is as simple as just looking for a color match between the two images. Now the problem I have with this mode is that the GIMP team has not gotten around to documenting it, so I was not (at first) certain exactly how this color erase really works. I then reduced the opacity of this top layer to 75%, and got an image with the bottom showing up through the top. I selected my top layer, the Dog photo, and left it in Normal mode. It is worth noting that this mode, like many of the Layer modes, can also be applied to Brushes which allows you to use it just in certain areas, but first let’s discuss doing it as a Layer mode. This mode dissolves the Top layer into the Bottom layer by means of partial transparency. ![]() And if we reduced the opacity of the Top layer or added some areas of transparency, then of course some of the Bottom layer would show through, but none if it comes through solely because of the Layer mode. If the Top layer was smaller than the Bottom layer, the areas not covered by the Top layer would show through. So the result is a nice picture of a dog. This means that the Top layer will entirely cover the Bottom layer in the resulting image because there is no transparency in the Top layer. And note that the Mode selected is Normal. ![]() Here we see the layers open in GIMP in the order I specified. ![]()
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