I implemented a pretty comprehensive fix to this over the weekend. I'll try to
turn it into a PR today.
-- lg
> On May 6, 2020, at 12:49 PM, Andreas Ekoutsidis
> <andreas.ekoutsi...@ilpvfx.com> wrote:
>
> For our needs, the most important thing is that the order of subimages
> remains the same. If an EXR contains multiple subimages, it's always the
> first that is the beauty image. And since we use oiiotool heavily for all of
> our deliveries any additional subimages in an EXR are just mattes. So at
> least we are only operating on the first subimage and in our case
> --colorconvert has been the only function so far for EXRs (as everything is
> already prepared in comp).
>
> I do like your idea about supplying subimage to each operation, but I'm happy
> with using --subimage command since it feels clean and easy to read. I guess
> it's just when you merge them back that might confuse people? But I don't
> have any better suggestions either. As long as it's mentioned in the
> documentation :)
>
>
> On Wed, 6 May 2020 at 19:13, Larry Gritz <l...@larrygritz.com
> <mailto:l...@larrygritz.com>> wrote:
> No, it's no trouble at all.
>
> I am wondering, though, if it's enough. This fix is relatively
> straightforward if you want to extract one subimage, change it alone, and
> then reassemble with the extracted subimage as the new first subimage (maybe
> you don't care about the resulting order, or maybe the first is the one you
> wanted to change anyway). It's a little tricker if you wanted to color
> correct subimage #5, and then reinsert it back in the #5 position. If that's
> important, I could add some sort of modifier to --siappend that lets you
> insert it into an arbitrary position rather than only at the end?
>
> Somewhat more generally, is this a common enough operation that
> --colorconvert should have a modifier that lets you apply it in place to just
> one subimage, without the extra steps of --subimage/--siappend? Or all the
> color conversion functions (like --ociolook, etc)? Or should nearly all
> oiiotool commands have an option that lets you restrict their work to a
> specific subimage? (That is obviously a lot more work.)
>
>
>
>> On May 6, 2020, at 1:15 AM, Andreas Ekoutsidis
>> <andreas.ekoutsi...@ilpvfx.com <mailto:andreas.ekoutsi...@ilpvfx.com>> wrote:
>>
>> Hey,
>>
>> Thanks for the super fast reply! Your fix works for me, as long as it
>> doesn't introduce other problems for your code :)
>>
>> On Wed, 6 May 2020 at 06:19, Larry Gritz <l...@larrygritz.com
>> <mailto:l...@larrygritz.com>> wrote:
>> How does this look as a potential way to address this case?
>>
>> https://github.com/OpenImageIO/oiio/pull/2575
>> <https://github.com/OpenImageIO/oiio/pull/2575>
>>
>>
>>> On May 5, 2020, at 5:25 PM, Larry Gritz <l...@larrygritz.com
>>> <mailto:l...@larrygritz.com>> wrote:
>>>
>>> Oof, that is currently an awkward thing to do.
>>>
>>> I think I know a way to do it, with some changes. Stay tuned, I'll try
>>> something tonight.
>>>
>>> -- lg
>>>
>>>
>>>> On May 5, 2020, at 6:37 AM, Andreas Ekoutsidis
>>>> <andreas.ekoutsi...@ilpvfx.com <mailto:andreas.ekoutsi...@ilpvfx.com>>
>>>> wrote:
>>>>
>>>> Hi,
>>>>
>>>> Is it possible to only operate on one subimage and still keep the rest
>>>> untouched?
>>>>
>>>> In my case I get EXRs from comp that have mattes as separate subimages in
>>>> the EXR. I want to perform a colorconvert on the main subimage of the
>>>> EXRs, but if I do so I lose the rest of the subimages:
>>>>
>>>> oiiotool /path/to/frame.exr --colorconvert linear AlexaV3LogC -o
>>>> /path/to/out.exr
>>>>
>>>> By reading around on the mail list here, I then got inspired into trying
>>>> this:
>>>>
>>>> oiiotool /path/to/frame.exr --subimage main --colorconvert linear
>>>> AlexaV3LogC /path/to/frame.exr --subimage matte1 --siappendall -o
>>>> /path/to/out.exr
>>>>
>>>> This will indeed create an EXR with the same number of subimages as
>>>> before, but the "matte1" remains completely empty. Subimage "main" has in
>>>> this case the channels "R, G, B, A" and "matte1" have the channels "red,
>>>> green, blue, alpha".
>>>>
>>>> What did I do wrong? Is this possible?
>>>>
>>>> I have tried this in both 1.8.17 and 2.0.12.
>>>>
>>>> Thanks in advance,
>>>> Andreas
>>>> _______________________________________________
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>>>> http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org
>>>> <http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org>
>>>
>>> --
>>> Larry Gritz
>>> l...@larrygritz.com <mailto:l...@larrygritz.com>
>>>
>>>
>>>
>>>
>>> _______________________________________________
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>>
>> --
>> Larry Gritz
>> l...@larrygritz.com <mailto:l...@larrygritz.com>
>>
>>
>>
>>
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>
> --
> Larry Gritz
> l...@larrygritz.com <mailto:l...@larrygritz.com>
>
>
>
>
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--
Larry Gritz
l...@larrygritz.com
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