Editing mipmaps in DDS

[ZoltanE]

I opened a DDS file and was happy to see all the mipmaps imported. I edited them but when I attempted to save the file I got a popup telling me that the edited mipmaps are not usable and will be regenerated. Is there a work around that?

[Gerhard Huber]

If mipmaps should be used, all mipmaps have to be present and the size has to be correct.
If not, PhotoLine will give the warning and generate new ones.

[ZoltanE]

If I open a DDS with mipmaps and try to save it without doing anything I get the same warning. I'm using 19.01 64bit.

[Gerhard Huber]

that's possible.
The DDS documentation says that there have to be mipmaps of every size, but there are programs that don't save it this way. I don't work with DDS, just read the documentation and do what there is.

[ZoltanE]

Good point, the original file was indeed missing the last few levels. So I opened it and saved it right away allowing PhotoLine to regenerate the mips. I closed the file, opened it again, saved it, got the warning.

Then I tried a different way: opened the source artwork, a PNG file. Saved it as DDS with mipmap generation, closed, reopened the file and tried to save it but the warning was there again. I don't seem to find a way to avoid the regeneration step.

[Gerhard Huber]

I will check it.
Took a 256x256 pixel image. Saved it with mipmaps. Loaded it again - 9 layers.
Saved it and got no warning. Think that's OK.

[ZoltanE]

It looks like that the problem only occurs with non square images, 256x512 or 512x256 resolutions for example.

[Gerhard Huber]

All my sample images are square.
I think you are right, non square images are not handled correct. I will fix this.

[ZoltanE]

Thank you for taking the time!