Right. The gist is that you have to read the input subimage by subimage,
writing to the output as you go, something like this (pseudocode):
open input file
create output file
while True :
read image from input (including spec)
break if the read failed because we've run out of subimages
alter spec to add metadata, if you want at this subimage
if this is the first subimage,
open output with the Create mode flag (and altered spec)
else
open output with the AppendSubimage mode flag (and altered spec)
write the output image
input.seek_subimage to the next subimage
break if seek_subimage failed because we're out of subimages
close the files
But there's something you do need to be careful about, which is that not all
image formats allow arbitrary metadata to be per-subimage. For EXR in
particular, there are some things that are allowed to vary between parts, and
other things that are not. It isn't a fully general container of arbitrary
images in one file.
> On Nov 16, 2017, at 10:51 AM, Andrew Gartner <[email protected]> wrote:
>
> Hey Deke,
>
> I don't have the exact code handy, but I've managed to do this a few times.
> If memory serves you just need to create imagespecs for each part with the
> proper metadata you want per-part and use the oiio.AppendSubimage with
> ImageOutput after calling open().
>
>
> outFile = foo.exr
> specs = tuple(...all your image specs with metadata...)
> output = ImageOutput.open(outFile, specsTuple)
> for part in range(1,len(parts)):
> output.open(outFile, outSpecs[part]. oiio.AppendSubimage)
> ....write image/scanlines with your data and the correct index to the
> image spec not sure if you ahve to do a full re-read from the source image....
>
> Hope that helps get you started, if someone else doesn't have exact code.
>
> ~Andrew
>
> On Thu, Nov 16, 2017 at 10:02 AM, Deke Kincaid <[email protected]
> <mailto:[email protected]>> wrote:
> Hi Folks
>
> Does anyone have an example of how to inject metadata with the oiio python
> bindings into a specific part of a multipart EXR?(part 0 for example) We
> keep trying to do this but the output is that all my parts disappear and I
> only have a part 0 in my output image.
>
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--
Larry Gritz
[email protected]
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