Stuff I have learned–or at least looked up–recently.
How to fade an image to transparency using GIMP
Create a layer mask for the layer you want to fade. Apply a black-to-white gradient to that layer. The area marked as black will show as transparent.
This worked in GIMP 2.10 on my Mac. I found that the stupid black-to-white gradient did not allow me to adjust the fade–it’s just locked at halfway. I made that work.
Here is the first useful link I found about this.
WTF is up with that stupid grey “Tool Options” box that appears on the top left of my screen when using GIMP?
This bug has been around for a while. It happens when you click (and maybe drag) inside the “Tool Options” tab in the Tools window. A grey box that says “Tool Options” appears on the top left of your screen, covering up the “File” and other menu items.
You can make it go away by clicking (and maybe dragging) in the Tool Options box. Try dragging the “Tool Options” text to the right just a little bit. This worked in GIMP 2.10 to 2.10.8 on my Macs running both El Capitan (10.11.6) and Catalina (10.15.3)
I just opened a really big image in GIMP on my Mac and now I can’t right-click on anything with my mouse!
Gosh, this sure is annoying. This happened in GIMP 2.10 in El Capitan on an old Mac Pro with 16 gigs o’ RAM.
You might be able to get regular mouse functionality back by opening the “Mouse” settings in System Preferences. All I had to do was open Mouse–that must make the OS check in with the mouse and give it a Stern Look.