What do you use to DXT5 compress .dds files?

[Pipcard]

I'm trying to save a grayscale heightmap and I tried the .dds export plugin for GIMP but it leaves RGB color artifacts.

And I can't save uncompressed because only DXT5 compression works with KSP 1.8 and up.

Edited September 3, 2020 by Pipcard

[R-T-B]

Are you using windows or linux?  If windows, you may try paint.net.  If Linux, well, you already tried GIMP...  so dunno.

[Pipcard]

27 minutes ago, R-T-B said:

Are you using windows or linux?  If windows, you may try paint.net.  If Linux, well, you already tried GIMP...  so dunno.

I tried paint.net and am getting the same result as GIMP: slightly purple artifacts when it should all be shades of gray.

(by the way, I'm trying to edit the Earth heightmap from Real Solar System)

Edited September 3, 2020 by Pipcard

[Pipcard]

I asked @Katniss218 on Discord and they said they use TexConvGUI (unzip with 7zip), with the output format being R16_UNORM for 16-bit grayscale heightmaps and BC3_UNORM for colored textures (or they just use GIMP for the latter).

I first saved to a .png then used the converter.

Edited September 3, 2020 by Pipcard

[R-T-B]

1 hour ago, Pipcard said:

I tried paint.net and am getting the same result as GIMP: slightly purple artifacts when it should all be shades of gray.

(by the way, I'm trying to edit the Earth heightmap from Real Solar System)

I see.  I honestly have no idea, was just a stab in the dark.