Search found 2 matches

by pjfingers
2016-07-18T08:44:24-07:00
Forum: Users
Topic: Adjust opacity leaving fully transparent sections unchanged
Replies: 4
Views: 4707

Re: Adjust opacity leaving fully transparent sections unchanged

Yep, multiply by desired opacity works great! Thanks for posting that one! 8) I also figured out a second solution as follows: convert in.png -channel A +level 39%,100% out.png Both work. The multiply opacity solution seems a little more obvious for anyone visiting the code in the future, so I went ...
by pjfingers
2016-06-07T13:13:15-07:00
Forum: Users
Topic: Adjust opacity leaving fully transparent sections unchanged
Replies: 4
Views: 4707

Adjust opacity leaving fully transparent sections unchanged

Hello! I have what seems to be a super simple task, yet I have spent hours looking through this forum as well as the IM docs trying to find a solution. Having tried 100s of variations I am still stumped. :shock: I am starting with a PNG image (it's a map tile) that has areas full of color and a tran...