That's a very good point, and I think you have highlighted that it would be
very helpful to have something in the expression syntax that expands to the
number of items currently on the stack, so you could do (just picking a name
arbitrarily):
oiiotool multipart.exr --sisplit --while "{NIMAGES}" ...commands... --pop
--endwhile
I'll put that on my list, unless somebody else would like to try tackling it
(it shouldn't be hard at all, look in oiiotool.cpp for the line `// Test some
special identifiers` in Oiiotool::express_parse_atom()).
If you really are dealing specifically with the case iterating the subimages of
one file, I think you could do this now:
oiiotool --for s "{IMG[input.exr].'oiio:subimages'}" input.exr --subimage
"{s}" -o "sub.{s}.exr" --endfor
???
So this iterates by subimage index, for each one re-specifies the input and
pulls out the indexed subimage.
I just did a -o to output the subimage, but of course you could do any
processing you want.
You're still kind of limited by how complex a command line you want to make, so
if that "per subimage" logic includes more decisions depending on what it
finds, in the end you may just find it unwieldy and perhaps a better solution
is to use the OpenImageio.ImageBuf kind of approach inside a small python
script?
> On Apr 25, 2023, at 12:35 PM, Matt Chaput <m...@sidefx.com> wrote:
>
> I want use `oiiotool` to apply certain processing to, and then output, every
> subimage (AOV) in an EXR file.
>
> The -a option works for some things (like resizing each subimage), and I can
> use `-sisplit` to get the subimages on the stack, then write them all to disk
> with `-o:all=1`. But there doesn't seem to be a way to apply general
> processing to each image on the stack, where some operations will have an
> expression that should evaluated for each image.
>
> What I can't seem to figure out, or maybe is missing, is a way to do the
> equivalent of:
>
> FOREACH image on the stack:
> ...process...
>
> or alternatively:
>
> WHILE stack size > 0:
> ...process...
> POP
>
> (What I want to do is resize every subimage, and for certain subimages
> (1-channel monochrome images), turn it into a heatmap... so I need to apply a
> "pipeline" involving stuff like --if, --subc {TOP.MINCOLOR}, --colormap, etc.
> etc. to each subimage. I would also like name the output files based on each
> subimage's "name" info.)
>
> Maybe the answer is to write out the subimages and then process them
> separately, but for performance reasons it would be nice to do it all in one
> call to `oiiotool`.
>
> My current idea for a workaround is two separate calls: one get the names of
> all the subimages, and then I build a very long `oiiotool` command line with
> args that extract, process, and output each named subimage separately.
>
> Anyone know a better way?
>
> Thanks,
>
> Matt
>
>
> _______________________________________________
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> Oiio-dev@lists.openimageio.org
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>
--
Larry Gritz
l...@larrygritz.com
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