GIMP - 知乎 GIMP 是 GNU Image Manipulation Program（GNU 图像处理程序）的缩写，是一套跨平台开放源代码图像处理软件，是遵循 GNU 授权条款发布的自由软件。
how to make a color transparent in GIMP @CsabaToth maybe i had a case with white areas in the foreground which i wanted not to make transparent, but i wanted transparency in the border, to not have white borders when selection is pasted onto other background
Gimp: changing all shades of a colour to another colour To add colour to a greyscale image, you first need to do Image > Mode > RGB, because greyscale images can't have any color Also can you share the image, because nearly every edit in GIMP will depend on the starting image - there are too many variables
Resizing a large number of Images with Gimp or IrfanView The gimp source is now out of date and script given in the answer is not a resize script just the generic example for an old version You need to call the batch script with the following parameters and it needs to be in your scripts directory