I don't know what's going on with the "unable to decode", that's where repro is
vital.
I'm not sure about the crashes, either, unless those are simply cases of
running out of memory.
High memory use: I'll need to know exactly what command line arguments you're
using so I can see what operations you're trying to do. In general, maketx
needs to hold the whole image in memory to do the down-size to get subsequent
MIP levels. I'm sure it could be changed to operate chunk by chunk for the big
image case. But also, there may be command line arguments you're using, or not
using, that could help.
I'm not aware of any specific problems with the PSB/PSD reader, but on the
other hand, I'm not sure how often it's used for images that big, or if there
is anything specific about your images that's making it hit some kind of edge
case.
By any chance, are you able to make a file you can send me that exhibits these
problems so I can easily reproduce it on my end and see what's going on? It
doesn't need to have "real content" -- if you can get a solid color,
checkerboard, or gradient to be problematic, that's even better as far as I'm
concerned.
-- lg
> On Mar 20, 2023, at 1:56 PM, Jens Olsson <jens.gustaf.johan.ols...@gmail.com>
> wrote:
>
> Hi!
> I was trying to read some really big PSBs to do some calculations on, but not
> having much luck when the file gets too big. The example I have is 85K x 100K.
> 1. maketx and oiiotool crashes with segmentation fault
> 2. iconvert exits with the error
> "unable to decode packbits"
>
> I managed to read/write scanline by scanline with ImageInput/ImageOutput
> while hacking madly, but the end result looked incorrect, like data had been
> teared or offset somehow.
>
> The memory load is pretty damn high as well, is it trying to read all of the
> image data into memory? I would think that by reading scanlines it wouldn't
> need to hold that much in memory.
>
> Any hints on how to best read PSB are greatly appreciated, I'm resorting to
> convert from PSB to tif with ImageMagick now before reading that through
> OIIO, but would prefer to read them directly since it quickly eats up
> storage. Are there known limitations with the PSB reader?
>
> Best regards,
> Jens
> _______________________________________________
> Oiio-dev mailing list
> Oiio-dev@lists.openimageio.org
> http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org
--
Larry Gritz
l...@larrygritz.com
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