problem with set color to alpha

[rickk]

(01-04-2022, 10:39 AM)Jeanne Wrote: Really posting my little story for others looking for a quick solution.  Hope this helps!

Hi Jeanne,  thanks for your help.

I've come such a long way in these past 2 years thanks to the patience and expert coaching of Rich, Ofnuts, and the rest of these folks.

Bighty's suggestion to use one of the paint tools in erase mode was an epiphany of sorts for me, never really realized that was possible. I had used gimp sparingly for about 15 years prior, and never managed to discover that.

Now that I'm old and have time on my hands, I've been amazed with what I have learned.

Now, my "go to" solution for the original problem is a targeted use of either fuzzy select or bucket fill in erase mode...but using the "threshold" adjustment at different levels until I get the desired output. I may end up having to undo, adjust, and reattempt 8-10 times, but with the right setting it can be lots easier than the way I've historically done it. 

I've also found that in highly varied background environments, for instance gravel,  (using bucket fill in erase mode) it really helps to try and retry clicking on various parts of the drawing, hoping to find a "sweetspot" in the color spread. Hit the right color, and you get perfect removal, but hit a color to either end of the range, and the results are  often disappointing.