Writing DDS image format has major errors

[rra]

the latest version can read DDS (type DXT1) OK , but saving the same image
in DDS DXT1 format gets data (colors) all scrambled up.

Not sure about other DDS types, anyone ??

René

V1.90 <x>

[xnview]

the latest version can read DDS (type DXT1) OK , but saving the same image
in DDS DXT1 format gets data (colors) all scrambled up.

Not sure about other DDS types, anyone ??

Really, i have no problem. Could you send me original file?

[rra]

The file is rather big , 16384 x 8192 x 32 bit,
all together something like 87 MB.
I will rar the file (compressed to 28 MB) and put it on my
personal webspace.
Alternatively I can also look for a smaller file with the same problem.

its URL is:


http://members.home.nl/ramekers/Earth.rar .

Just reading the file with XnView and saving it back as the same type
with different name, and reading the copy back will show what went wrong.

If you have trouble obtaining the file send me a message.

Thanks ,

René

[xnview]

The file is rather big , 16384 x 8192 x 32 bit,
all together something like 87 MB.
I will rar the file (compressed to 28 MB) and put it on my
personal webspace.
Alternatively I can also look for a smaller file with the same problem.

its URL is:


http://members.home.nl/ramekers/Earth.rar .

Just reading the file with XnView and saving it back as the same type
with different name, and reading the copy back will show what went wrong.

If you have trouble obtaining the file send me a message.

Thanks ,

René

Do you have a smaller file??

[rra]

Yes , this one is "only" 8 MB, problem is the same is te bigger one:


http://members.home.nl/ramekers/Earth8k.zip


René

[Olivier_G]

Samples are not available anymore.

I tried saving in DDS format and got the right colors/images (dimensions are 2^n only, but that seems to be a characteristics of the format itself).

[rra]

I have placed a similar DDS texture on my website,
it is rarred to conserve space.


http://members.home.nl/ramekers/Earth8k.rar


Just resize the original 8K DDS file (50% for example), save it into DDS format, and reload the smaller DDS file again !!


René Ramekers[/img]

[xnview]

I have placed a similar DDS texture on my website,
it is rarred to conserve space.


http://members.home.nl/ramekers/Earth8k.rar


Just resize the original 8K DDS file (50% for example), save it into DDS format, and reload the smaller DDS file again !!


René Ramekers[/img]

Yes, but currently i don't find this bug...

[rra]

Pierre, are you saying the bug is fixed ??
What version (beta ??) are you referring to ?
I tried it with beta 5 I believe .

René

[xnview]

Pierre, are you saying the bug is fixed ??
What version (beta ??) are you referring to ?
I tried it with beta 5 I believe .

René

No, i don't find how to fix it....

[eyebex]

I can confirm the bug "rra" described (using beta 5). Here's what I did exactly:

- Open the DDS by double-clicking on it (if needed, you need to associate it with XnView first).

- Resize the image to 50% with "Keep ratio" and "Lanczos" checked.

- "Save as..." the image under a different name.

- Close XnView.

- Open the new image by double-clicking on it.

Here's how the broken new image looks like:
http://www.tu-bs.de/~y0011326/Earth8k_resized.png

EDIT: In case you've written the DDS / DXT (de-)compression code yourself, I can recommend to use squish instead.