Save corruption on specific dds files

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ytrfamli
Posts: 1
Joined: Sun May 07, 2017 2:26 am

Save corruption on specific dds files

Postby ytrfamli » Sun May 07, 2017 3:37 am

Hello,

I noticed XnView had issues with specific dds files from a game when I tried to save them as the same format (no change to extension) -- the image became wider and taller in exact powers of 2 (for example, a file of 1108x92 becomes 2048x128 in dimension) , and there's visible loss of information at the extra parts. (mostly the image repeats to the right, it does not add extra pixels vertically other than space)

Initially I thought it's just the game's problem (maybe its files doesn't conform to standards), but after more experiments it is evident that for some reason, XnView just doesn't handle these specific dds files correctly, for:
1. This doesn't happen on other dds files from the same game.
2. If I convert the dds file in question to other formats first, say, PNG, nothing goes wrong, but when I proceed to convert the PNG again to dds, the corruption surfaces.
3.Once the corruption is in place, saving/resaving does not further corrupt the image - there is likely something irregular in the dds, that persist so long as XnView does not save as dds on it's own. Once XnView saves it, the irregularity is fixed albeit not correctly.

======================

Short Description: XnView has some problems handling save to dds format
To Reproduce : Open the attached dds, simply save it again as dds.
Attachment content :
sprite_saw_guardleft.dds - dds file in question.
sprite_saw_guardright.dds - another dds file in question. Note this is an entirely different file from the game, not a horizontal flip of the previous.
sprite_saw_guardleft_corrupt.dds - Sample of what a corruption looks like
XnView Version: 2.40 Classic (Apr 18 2017)

Thanks.
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Re: Save corruption on specific dds files

Postby xnview » Mon May 15, 2017 12:28 pm

a known issue, DDS output can only be with power of 2 for dimensions...
Pierre.


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