Unfortunately, an omission made it very hard to write a multi-subimage file
(like an animated GIF) from the Python API, until a patch that just landed in
the last week. So at the very least, you'd need to do a fresh OIIO build from
the current top of master. It's not rocket science, but it's still going to be
(even with the new release) 10-20 lines of Python to do it right. That oiiotool
command line does all the tricks for you automatically.
-- lg
> On Jul 17, 2020, at 1:48 PM, Jerome Raim <[email protected]> wrote:
>
> Larry,
> I appreciate your quick response!
>
> I was hoping to keep it all native-Python and not have to spit out temporary
> files.
>
> CLI is definitely an easy option, so I could run it as a subprocess in my
> python script.
>
> Best,
> Jerome
>
> On Fri, Jul 17, 2020 at 4:37 PM Larry Gritz <[email protected]
> <mailto:[email protected]>> wrote:
> You're half way there -- this python script splits all the non-RGB channels
> out into separate JPG files.
>
> It's easy to convert your jpegs to an animated GIF from the command line:
>
> oiiotool *.jpg -siappendall --attrib FramesPerSecond 1.0 -o anim.gif
>
> Doing it from Python is possible (given a very recently posted fix), but
> frankly is unnecessarily complicated compared to the above single command.
>
>
>
>> On Jul 17, 2020, at 1:30 PM, Jerome Raim <[email protected]
>> <mailto:[email protected]>> wrote:
>>
>> Hello all,
>> I'm writing a script to help operators inspect all available channels that
>> aren't RGB in an EXR. I'd like to create a 1fps GIF that shows all non-RGB
>> channels.
>>
>> I am able to extract each channel and save it as JPG, but not finding the
>> proper syntax to save it as an animated GIF.
>>
>> What I have so far:
>>
>> import OpenImageIO as oiio
>> from OpenImageIO import ImageInput, ImageOutput
>> from OpenImageIO import ImageBuf, ImageSpec, ImageBufAlgo, ROI
>>
>> input_path = 'vfx.exr'
>>
>>
>> img = oiio.ImageBuf(input_path)
>>
>> for ch in [c for c in spec.channelnames if not c in ['R', 'G', 'B']]:
>> ch_img = ImageBufAlgo.channels(img, (ch,ch,ch), newchannelnames=("R",
>> "G", "B"))
>> ch_img = ImageBufAlgo.fit(ch_img, roi=ROI(0,640,0,480,0,1,0,3))
>> ImageBufAlgo.render_text(ch_img, x=0, y=100, text=ch,
>> textcolor=(1,1,1,1))
>>
>> ch_img.write("{}.jpg".format(ch) ##
>>
>>
>> Thanks in advance for your help.
>>
>> Best,
>> Jerome
>> _______________________________________________
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>
> --
> Larry Gritz
> [email protected] <mailto:[email protected]>
>
>
>
>
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--
Larry Gritz
[email protected]
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