Pixels after exporting to .DDS

[Smurf]

Hi. I have a problem with my texture when converting it to .dds. The texture has different tarmac and white lines textures, but I am sending a texture with the same repeated layers (I will not send the full texture here).

The problem is when I convert texture to DDS, it has blurry pixels every time on the same rows—always on the 2nd, 3rd, 6th and 7th rows. The blurry pixels are from the right side of the white lines.
The white lines must be "Vivid Light" opacity 60%. The file must be any DDS.

When I export, I go to "Merge visible layers" then convert to .DDS. I tried to convert from Gimp to .dds like:
- DXT1
- DXT1
- DXT3
- DXT5
- RXGB
- DXT5
- Alpha Exponent DXT5.
- DXT1 with generate Mipmaps

I tried everything, connecting layers before, etc... 
Is it a mistake in connecting layers, or effect Vivid Light or Gimp can't do that?
Can I send someone a file via PVT to check?

[Scallact]

dds is a lossy format, so you can't avoid some wrong colors in complex textures. I suppose it's the problem here, because the pixels you point to are near a black and a light grey lines.A typical compression in dds (I don't remember which ones) accepts only 8 colors in each 4x4pixels square, and the interval between these 8 colors are constant. This can create the kind of artefacts you are seeing.

GIMP 3.2 soon to be published can export in BC7 format. Try it on the RC3, or wait until it's released, maybe it's better (I don't know its characteristics).

Here a (technical) website about those formats: http://sv-journal.org/2014-1/06/en/index.php?lang=en

[Smurf]

(03-08-2026, 01:09 AM)Scallact Wrote: dds is a lossy format, so you can't avoid some wrong colors in complex textures. I suppose it's the problem here, because the pixels you point to are near a black and a light grey lines.A typical compression in dds (I don't remember which ones) accepts only 8 colors in each 4x4pixels square, and the interval between these 8 colors are constant. This can create the kind of artefacts you are seeing.

GIMP 3.2 soon to be published can export in BC7 format. Try it on the RC3, or wait until it's released, maybe it's better (I don't know its characteristics).

Here a (technical) website about those formats: http://sv-journal.org/2014-1/06/en/index.php?lang=en

Hi. Thanks for reply.
I don't need other format. My game engine accept only .dds file, so I need dds.

Friend told me that he doesn't had that problems with Photoshop and Intel DDS exporter.

[Scallact]

(03-10-2026, 11:59 PM)Smurf Wrote: Hi. Thanks for reply.
I don't need other format. My game engine accept only .dds file, so I need dds.

Friend told me that he doesn't had that problems with Photoshop and Intel DDS exporter.

DDSis a wraper format, it can contain different formats. BC7 is part of the DDS format.

Did your friend try with the same file?