Hey folks,
I'm trying to use rvio to rename the RGB channels in an exr to some artibrary name. I have that working with this command:
rvio in.exr -inchannelmap R G B -outchannelmap x y z -o out.exr
This works, however the compression is different (in.exr was zip, out.exr is piz), and all of the header from in.exr is lost. Is there a way to change channel names but preserve compression and metadata?
cheers,
Dan
Hi Dan,
I have not used this feature much myself but in the "rvio_hw -help" you will see:
"Passthrough syntax: -outparams passthrough=REGEX"
I think you might be able to add "-outparams passthrough=.*" to your command to copy all metadata.
Also in the "rvio_hw -formats" you will see:
"format "exr" - OpenEXR Image (Read, Write)
image codecs:
PIZ (piz-based wavelet compression)
ZIP (zlib compression, in blocks of 16 scan lines)
ZIPS (zlib compression, one scan line at a time)
RLE (run length encoding)
PXR24 (lossy 24-bit float compression)
B44 (lossy 4-by-4 pixel block compression, fixed compression rate)
B44A (lossy 4-by-4 pixel block compression, flat fields are comressed more)
DWAA (lossy DCT based compression, in blocks of 32 scanlines)
DWAB (lossy DCT based compression, in blocks of 256 scanlines)
NONE (uncompressed)"
I think you simply need to add "-codec ZIP".
Please let me know if that works for you.
Thanks,
Jon
Hey Jon,
Thanks for the reply, the codec flag works as described, however -outparams passthrough=.* doesn't copy any metadata for me. I'll try using regex patterns and see how I fare.
cheers,
Dan
.