Create a new layer group so it doesn't interfere with layers below it. To add colour to a greyscale image, you first need to do image > mode > rgb, because greyscale images can't have any color. 如 gimp, 如果有多个版本，可以在此文件夹下再建文件夹以区分，比如 gimp/2.10。 如果你删除或者重命名了这个文件夹，gimp会再生成一个文件夹，重复初始化设置，这样你可以在不删.
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Also can you share the image, because. 4 人赞同了该回答 除了图像处理的 gimp, 这里再推荐视频的影视级合成开源软件 natron,匹配nuke的！ 还有免费不开源的 fusion！ 达芬奇套件！ 还跨平台！ ！！ 比如linux系统就可以搞. How do i create a free form selection around the document in gimp, and crop it to a perfect rectangle, gradually compacting/stretching the content so that the document looks.
Gimp 2.10 的软件界面，图像是我多年前在 gimp paint studio 2.4 中绘制的。 gimp 的定位和 ps 一样是图像处理软件，但它比较“自成一派”，绝大多数的操作都要重新学习。
Make a selection with a selection tool, or use ctrl + a to select the entire image on the selected layer copy it using ctrl + c do file > create > from clipboard, or use the short. Put the image as the background and the transparency mask layer as the foreground in the layer group.
