Open Source image editor that handles PNG Alpha transparency correctly?

4

1

I want to be able to take a sample image, and be able to fade out the background.

For example, I might take a picture of a bird. Make most of the background almost completely transparent, and have a smooth transition to full opacity adjacent to the subject.

Most of all, I want to be able to save / export to PNG.

Brad Gilbert

Posted 2009-08-15T20:59:15.430

Reputation: 771

Question was closed 2015-01-19T04:25:13.140

2Which operating systems should it run on? – Jonas – 2009-08-15T21:09:14.583

I would like to be able to run on Linux. I specifically didn't specify an operating system, because I wanted this to be as useful as possible, to everybody. – Brad Gilbert – 2009-08-16T16:35:42.617

Answers

14

As far as I know, GIMP should be able to do what you want. It's free and open source.

Sasha Chedygov

Posted 2009-08-15T20:59:15.430

Reputation: 6 616

11

Paint.NET if you're on Windows. IMO, a lot easier to deal with than The GIMP, if you're already slightly familiar with Photoshop.

Ian

Posted 2009-08-15T20:59:15.430

Reputation: 387

This was never open source, just freeware with source available. Rick decided to close the source access so it is now a binary only distribution. Now what is interesting is the license talks about source code so technically you could beat some drums and get the source code and require a license change! – Wayne – 2009-08-16T00:34:28.370

3I suspect the poster was primarily concerned about the Free Software aspect typically associated with Open Source... ;) – Ian – 2009-08-16T21:04:54.327

Free is nice. Open Source is better. – Brad Gilbert – 2009-09-17T05:49:09.093

1

Gimp is a great application. However, the learning curve is pretty steep. I have not figured out how to do a simple color replacement or transparency with it yet. The easiest program I have ever used for that is Paint Shop Pro.

After reading about Paint.Net I downloaded it. It beat Gimp Hands Down. A great program for the Novice.

Ande

Posted 2009-08-15T20:59:15.430

Reputation: 11

1Programs easily used by a novice tend to be under-powered when you are no longer a novice. If you don't plan on becoming a expert at it, go ahead and use whatever is easier for you. – Brad Gilbert – 2012-02-15T21:40:11.090