Hi Larry,
(b) is the closest to what I'm trying to do.
Since sending my initial email, I'm now doing this. This keeps RGB in
dest_img, and copies G from src_img into new_layer.new_channel
src_img = oiio.ImageInput.open(src_image_file)
dest_img = oiio.ImageInput.open(dest_image_file)
src_data = src_img.read_image()
dest_data = dest_img.read_image()
src_spec = src_img.spec()
dest_spec = dest_img.spec()
src_img.close()
dest_img.close()
width = dest_spec.width
height = dest_spec.height
new_channels = list(dest_spec.channelnames)
new_channels.append("new_layer.new_channel")
copy_channel_indices = [1]
out_data = np.concatenate((dest_data, src_data[:, :, copy_channel_indices]),
axis=2)
out_img = oiio.ImageOutput.create(dest_image_file)
out_spec = oiio.ImageSpec(width, height, len(new_channels), "float32")
out_spec.channelnames = tuple(new_channels)
out_img.open(dest_image_file, out_spec)
out_img.write_image(out_data)
out_img.close()
Thanks
Hugh
On 14/08/2022 23:02, Larry Gritz wrote:
Hi, Hugh. Can you clarify whether you want to
(a) make a new RGB image R from B but G and B from A?
(b) make a new image with an additional channel, yielding {R, G, B,
and New}, where R,G,B came from A and New is the R channel from B?
?
On Aug 8, 2022, at 8:14 AM, Hugh Macdonald
<hugh.macdon...@scanlinevfx.com
<mailto:hugh.macdon...@scanlinevfx.com>> wrote:
Hey all,
I'm not overly familiar with the OIIO python API, so apologies if
this is quite a simple question! I can't find any information online
on how to do this with the Python API...
I've got 2 EXRs, both with RGB channels, and I'd like to take the R
channel from one of them and put it into another channel in the other.
I've been looking at doing a 2-step process. The first step being to
rename the channels in one ImageBuf, and to remove the unneeded
channels, and the second being to use ImageBufAlgo.channel_append()
to combine the two images together.
This feels like it is unnecessarily 2 steps. Could someone point me
at some examples for how to do this in a single step?
I'm sure that this is pretty simple, but all the examples that I can
find are for how to do this kind of thing using oiiotool, rather than
doing it directly using the API.
Thanks
--
Hugh
_______________________________________________
Oiio-dev mailing list
Oiio-dev@lists.openimageio.org <mailto:Oiio-dev@lists.openimageio.org>
http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org
--
Larry Gritz
l...@larrygritz.com <mailto:l...@larrygritz.com>
_______________________________________________
Oiio-dev mailing list
Oiio-dev@lists.openimageio.org
http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org
--
Hugh Macdonald
Product Owner, Volumetric Capture
Eyeline Studios
Ext: 4165
www.scanlinevfx.com
_______________________________________________
Oiio-dev mailing list
Oiio-dev@lists.openimageio.org
http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org
