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I created an RGBA image as png file using Blender. When opening image with GIMP, not everything is visible.

Here's the original png file created with Blender: http://i.stack.imgur.com/4I9rF.png

Here how does it looks in GIMP:

http://i.stack.imgur.com/5ZlgJ.png

Here's how it should look like (use command: ffmpeg -i original.png out.mp4 [using original image] to see for yourself):

http://i.stack.imgur.com/smljb.png

The third image is a movie, using ffmpeg to convert original image to movie.

How to view all data in png file using GIMP? Is there any other graphics software that will read .png file correctly?

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Can you get anything else to see the "rays" effect? Just tested your original file in a couple of browsers (Chrome, IE8) over a black background and both looked like your GIMP example. So did Paint.net. –  e100 Mar 15 '11 at 20:09
    
That's the problem. The rays are initially visible in Blender, after that only ffmpeg can see it. I also did try other software, but no luck. It's weird that most of the software can't handle this type of png format. –  user865 Mar 16 '11 at 8:09

1 Answer 1

up vote 1 down vote accepted

Ok, I solved the problem. The GIMP and other software works perfectly well, it's the Blender fault. Somehow Blender doesn't save the alpha channel correctly for effects (in my case it was Glow effect). The rays had alpha set to 0, so they're invisible. If you open that png file in GIMP, view Channels and edit Alpha channel you can reveal the hidden content.

http://i.stack.imgur.com/9jv53.png

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Sorry we couldn't be more help to you Mario. Glad you've fixed the problems though –  Dan Hanly Mar 16 '11 at 17:11
    
So the movie was just showing the full RGB image, the alpha having been discarded? –  e100 Mar 16 '11 at 19:09

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