I'm not quite sure I understand what you're getting at.
For example, can you modify the script I posted a couple messages back to try
to do what you want, so I can better understand what you're trying to do?
-- lg
> On Feb 22, 2022, at 8:07 AM, Jerome Raim <[email protected]> wrote:
>
> Thank you so much, very helpful. Hopefully the last question regarding this.
> In my actual script I'm iterating through all the external matte channels,
> seeing if their names collide and giving them new names in case they do.
>
> I was hoping to first create an empty image buf where the image spec has a
> not-yet-known number of channels. So I was trying to just add a ROI and half
> float format, but I was unable to write the subimage with the image spec
> having zero channels (even though I'm adding channels shortly thereafter).
>
> My workaround right now is to:
> matte_buf = ImageBuf(comp.spec())
> matte_buf = ImageBufAlgo.channels (matte_buf, (0,))
>
> add all the matte channels and at the very end remove that first channel:
> matte_buf = ImageBufAlgo.channels (matte_buf,
> tuple((matte_buf.spec().channelnames[1:])))
>
> Is there a more elegant solution?
>
>
>
> On Tue, Feb 22, 2022 at 2:35 AM Larry Gritz <[email protected]
> <mailto:[email protected]>> wrote:
> On Feb 21, 2022, at 3:22 PM, Jerome Raim <[email protected]
> <mailto:[email protected]>> wrote:
>>
>> Larry, would you mind terribly boiler-plating some Python code on to create
>> a single EXR with subimage 0 is RGB and subimage 1 is
>> matte01,matte02,matte03,matte04 (ie combining the channels of the 2 matte
>> EXRs).
>
> In your original email, you said: out_filepath = '/tmp/exr.rexr'
> "rexr" isn't a known extension, and that definitely will cause problems. But
> I don't know if that was related to your real issues, or if it was just a
> typo in your email.
>
> But in any case, the following python script does what you asked:
>
>
> #!/usr/bin/env python3
>
> import OpenImageIO as oiio
>
> comp_buf = oiio.ImageBuf("comp-test02-roiMisMatch.exr")
> matte_buf = oiio.ImageBuf("matte-test02-roiMisMatch.exr")
> matte2_buf = oiio.ImageBuf("matte2-test02-roiMisMatch.exr")
>
> combined_matte_buf = oiio.ImageBufAlgo.channel_append(matte_buf, matte2_buf)
>
> out_filepath = 'exr.exr'
>
> out = oiio.ImageOutput.create (out_filepath)
> if out is None :
> print ("Could not create output file: ", oiio.geterror())
> exit(1)
>
> out.open(out_filepath, (comp_buf.spec(), combined_matte_buf.spec()))
> comp_buf.write(out)
> out.open(out_filepath, combined_matte_buf.spec(), "AppendSubimage")
> combined_matte_buf.write(out)
>
> out.close()
>
>
> --
> Larry Gritz
> [email protected] <mailto:[email protected]>
>
>
>
>
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--
Larry Gritz
[email protected]
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