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Open the image you want to use as an alpha channel (or that it contains the alpha channel you want to use) in gimp; From the menu, select " Color -> Components -> Decompose "; From the popup window, select the color model (RGB or RGBA), ensure " Decompose as layers " is checked, and " Foreground as registration color" is unchecked ;
Also can you share the image, because nearly every edit in GIMP will depend on the starting image - there are too many variables. – Billy Kerr Commented Jun 20, 2022 at 23:33
文字排版的微调选项很丰富。GIMP 的矢量图形和图像处理功能比 Krita 成熟，功能齐全，性能好，影响使用的缺陷较少。GIMP 进入中国用户视野的时间要远早于 Krita，它的中文教程和资源目前要比 Krita 丰富。
As a matter of background you can think of the Gimp image as a number of layers over a canvas. The idea is to extend the canvas, add the second image as a layer. Next move the layers so that they do not overlap. Open file1.jpeg using Gimp. Save file1.jpeg in the native Gimp format. Say we save it to file1.xcf. Expand the canvas.
You can utilize multiple selection tools for a single selection. Try color selecting the stroke with the Magic Wand (adjust the tolerance at the top to refine the selection) then using any of the other selection tools like the Rectangle Marquee tool for example, hold shift and select the area within.
It's also possible to downscale an image without losing too much resolution in GIMP using a similar method, however I prefer to use Inkscape because it's a lot easier to do it with Inkscape. The original image can be a file format like .png, .svg, .jpg, etc., preferably .png or .svg because Inkscape will save .jpg images as .png files.
There's a plugin for GIMP called G'MIC* which has an animated Morph feature as well as many other filters. It also works in Photoshop and Krita. Once installed it's located at Filters > G'MIC Qt > Deformations > Morph (interactive). Instructions appear in the Window of the plugin.
The instructions work perfectly, and the creation of the new file from layer is near-instantaneous, but I just encountered enough trouble regarding precise communication as to cause me to create this account, log in, and advise that, where above, per Billy Kerr and Scrampus, you see "toolBAR" you might do well to instead read "toolBOX".
I am new to Gimp. I would like to warp an image such that it fills the closed path (closed path and imported image is shown in the image below). The given closed path has a shape of truncated pie. The outer diameter of truncated pie is 15 units and inner diameter of it is 5 units, and the angle of that pie is 60 degrees.
From the Filters menu in the main Gimp window (or Xtns in earlier versions), select Batch Process... to bring up the DBP window. In the Input page, Add your files and click Open; In Processing, select Resize; Choose PNG as Output; This question in Superuser has some other options as well.