ImageBufAlgo::channels() provides a general way to copy one ImageBuf to another
with arbitrary channel reordering, truncation, or addition/insertion of black
channels.
It's exposed through oiiotool as the new "--ch" command, where the argument is
a comma-separated list of channel numbers and/or names (you can mix and match).
Here are some examples of how it can be used:
Turn a single channel image into gray RGB:
oiiotool gray.tif --ch 0,0,0 -o rgb.tif
Copy just the color from an RGBA file, truncating the A, yielding RGB only:
oiiotool rgba.tif --ch R,G,B -o rgb.tif
Zero out the red and green channels:
oiiotool rgb.tif --ch -1,-1,B -o justblue.tif
Swap the red and blue channels from an RGBA image:
oiiotool rgba.tif --ch 2,1,0,3 -o bgra.tif
Extract just the named channels from a complicted many-channel image:
oiiotool allmyaovs.exr --ch spec.R,spec.G,spec.B -o spec.exr
Along the way I also fixed a bug I recently introduced when I refactored
IB::get_pixel_channels that messed up iv single channel viewing.
You can merge this Pull Request by running:
git pull https://github.com/lgritz/oiio lg-channels
Or you can view, comment on it, or merge it online at:
https://github.com/OpenImageIO/oiio/pull/418
-- Commit Summary --
* Add optional strides to ImageBuf get_pixels and get_pixel_channels.
* ImageBufAlgo::channels can select, shuffle, truncate, or extend channels.
* oiiotool --ch to select, shuffle, truncate, or extend channels.
-- File Changes --
M src/doc/oiiotool.tex (49)
M src/include/imagebuf.h (55)
M src/include/imagebufalgo.h (21)
M src/libOpenImageIO/imagebuf.cpp (32)
M src/libOpenImageIO/imagebufalgo.cpp (81)
M src/oiiotool/imagerec.cpp (22)
M src/oiiotool/oiiotool.cpp (106)
M src/oiiotool/oiiotool.h (18)
-- Patch Links --
https://github.com/OpenImageIO/oiio/pull/418.patch
https://github.com/OpenImageIO/oiio/pull/418.diff
---
Reply to this email directly or view it on GitHub:
https://github.com/OpenImageIO/oiio/pull/418
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