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GIMP and DDS files

Area for texture-specific, modding-related discussion. Topics that involve models/meshes/actors go in the mesh area. As with other non-toolset related content, answers not guaranteed.

GIMP and DDS files

Postby giftfish » 08 Jun 2015, 16:47

Does anyone else around here use GIMP to edit textures?

I'm using the DDS plugin, but I still end up having compatibility issues with many DDS files -- including those extracted straight from the game files. It seems that many of the problems have to do with how it's reading the alpha channel. For example, here's what the HMF Frek Diff looks like for me in GIMP as soon as I open it:

Spoiler:
Image

You can see the face texture is there, but it's extremely faint. The opacity is set to 100%; this is not something due to an incorrect setting. Oviously I can't edit this texture. If I try re-saving it in GIMP and then re-opening, it also doesn't fix the issue.

When I open the same texture in Compressonator, it looks like this:

Spoiler:
Image

This matches what it looks like in Texplorer. Unfortunately, Compressonator doesn't have any editing features -- I can't even get its "Save" or "Batch" features to work. All I can use it for is a viewer.

And, to make matters even more complex, this is what the texture looks like in the DirectX Texture Tool (version in Kfreon's "Old DDS Tools"):
Spoiler:
Image

While I've been working on my new ME1/ME2 PTs, I've also experienced other weird things with certain textures extracted from old TPFs. Mostly involving those that TPF Tool identifies and extracts as PNG/TGA/BMP. These I can open in GIMP (mostly), but even after editing and resaving them in what should be the "proper" format according to Texplorer, I'll get weird results in game (glowing red eyes and such).

I should also emphasize that there are many textures that give me no problems at all in GIMP. It's a powerful program, certainly on par with Photoshop. I can open, edit, save, many textures of all formats and they work just fine in game. But, I often run into the issues above, and in those cases, I am 100% out of luck. I can't edit that texture with any piece of software I own.

Has anyone else experienced these issues?
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Re: GIMP and DDS files

Postby Kinkojiro » 08 Jun 2015, 22:49

I have had issues with GIMP - from memory it was not handling normal maps properly. I found that editing those in paint.net proved more reliable. Also sometimes I export from gimp/paint.net in png and change the dds settings and generate mipmaps in DXD Texture Tool. It seems the most reliable way of avoiding problems.
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Re: GIMP and DDS files

Postby giftfish » 09 Jun 2015, 00:38

Kinkojiro wrote:I have had issues with GIMP - from memory it was not handling normal maps properly. I found that editing those in paint.net proved more reliable. Also sometimes I export from gimp/paint.net in png and change the dds settings and generate mipmaps in DXD Texture Tool. It seems the most reliable way of avoiding problems.

Sometimes I have issues with normals, sometimes it's other files (like with the Diff above). I just scaled a batch over the past couple of days and didn't run into any problems. Other times... it gets grumpy, lol.

That latter tip is a good idea. Maybe I'll try that for the eye texture I was trying to get to work. Soulful Eyes for ME3 just ends up too dark in ME2 (a bit like Liara's ME3 head, lol). I spent some time editing it the other day, and couldn't get it to work properly in game.
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