![]() ![]() Then, in the window " Color to Alpha " to " OK " to save your changes.If you change the values a little now, you can refine your result further. The first slider changes the areas that are made transparent and the second changes the intensity. To adjust your selection even more precisely, you can use the " Transparency Threshold " and " Opacity Threshold " threshold sliders to change the values.You may need to experiment a little here until you get the best result. This helps you to make areas that were accidentally transparent again visible. Now click on the last eyedropper icon on the right to select a color in your image that should not be made transparent.This should be lighter than the previously selected color, as this determines which color spectrum should be made transparent. If you now click on the second pipette symbol on the right edge of the window, you can select another color.If you click on the first eyedropper icon on the right, you can choose a color in your image and make it transparent. The " Color to Alpha " dialog box opens.In the GIMP menu bar click on " Layer " and after " Transparency " select the option " Color to Alpha ".You can also go back and color in any pixels that were supposed to remain opaque but may have been made transparent. Once you've eliminated the base of the colors that you want to make transparent, you can use the Eraser tool, for example, to mark all the pixels that you still want to make transparent. ![]() Regardless of the technique you choose, you will most likely end up with imperfections, as is the case with our sample image. However, depending on how complicated your image is, you may not be able to get a really optimal result even with the sliders.ħth step: Unfortunately, there is no perfect way to make a color transparent in the GIMP. There's no real formula for it, so just give it a try and adjust the sliders until you get the result you want. The values you should use vary from picture to picture. Now adjust these two sliders to optimize your selection. Decreasing the value has the opposite effect. As you increase the value, more colors in the selected spectrum become opaque. Opacity Threshold : This controls the intensity of the opaque area. As you increase this value, more colors are picked up from the spectrum and made transparent. In the " Color to Alpha " menu you will see two sliders: Transparency Threshold : This controls the intensity of the transparent areas. This is where the threshold value sliders come into play. However, as you can see in our sample image, there are some areas that are also transparent next to the flower. what's the correct way to get the white (or any color) background pixels to be made transparent - and preserving anti-aliasing in the process? It's easy in GIMP, but I haven't found how to do it in any version of Pixelmator.5th step: At this point you are almost done. what is the correct way to change the "white" (or any color) so it's transparent, and it preserves the full anti-aliasing in the same way as GIMP? If I use masks, I can get _some_ anti-aliasing, but it's not the same anti-aliasing as the original, with the difference between the original and the "mask to transparency" shown below: The gray pixels on top are a problem, because they can be visible if put on a black background, like so: The image below has "gray" pixels on the top of the text, and the bottom loses all anti-aliasing: As far as I've been able to use it, masks have the same problem too. With Pixelmator, I seem to have to choose between less effective options, where I either end up using the select color tool, which will select too much (or not enough) of the black text - either leaving "grey" pixels from anti-aliasing, or removing the anti-aliasing altogether. ![]() (If you put a black background behind the layer, it stays all black, because there are no "white" pixels there - there are only the black and alpha/black pixels: With GIMP, it just works.Įxample: I start with the following (zoomed in) anti-aliased image:Īnd a couple of clicks in GIMP, and I get an image with the White changed to transparent - and the anti-aliasing remains correct. You'll have to zoom in quite a bit to see any of what I am trying to show.Īlso keep in mind, the color may be any solid color - blue, heliotrope, whatever. Gimp has a "Color to Alpha" option, which is useful to easily remove a colored background from an image, while also preserving anti-aliasing. I'm liking Pixelmator, but there's one feature from GIMP that I'm missing - and I'm not quite sure how to do the same thing in Pixelmator. ![]()
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