Yeah I figured you would suggest that ... I do want to keep all the metadata and channel names.
On Thu, Jul 25, 2019 at 11:17 AM Larry Gritz <[email protected]> wrote: > Is there a reason you're reading a file to make a black image? Is that > just a way of setting up the right resolution and channel names and > metadata? > > The stats are probably a little misleading. When inputting a big image (4k > x 27 chans!) it will be backed by ImageCache and tiles read on demand, so > all the input costs are actually showing up in the --ch (it's reading bits > as it needs it). > > I think it should be fast to just create a new image from scratch: > > oiiotool -create 4096x2000 37 -chnames R,G,B,A,alice,bob,charlie -d > half -o black.exr > > > > On Jul 25, 2019, at 9:06 AM, Will Anielewicz <[email protected]> > wrote: > > Im using a bit older a version 1.7.17. > Im trying to find the quickest way to set the RGBA default channels of a > 37 channel 4k openexr file to a 0.0 value. Im doing this to replace > missing/bad frames in a sequence. On my fairly hefty workstation its taking > 48 seconds. I could just do this once per sequence and duplicate for every > other missing/bad frame but ... Im trying to keep everything else in the > file intact like resolution and metadata etc > At first I tried this ... which understandably takes 48 seconds. > > oiiotool -i frame.exr --mulc 0.0 -o foo.exr > > after reading the programmer document with it's excellent examples I did > this: > > oiiotool -threads 0 --autitile 1 --threads 0 --autotile 1 -i:ch=R,G,B,A > frame.exr --ch R=0,G=0,B=0,A=1 --compression "zip" -o foo.exr > > still took 21 seconds ... ... > > Threads: 32 > oiiotool runtime statistics: > Total time: 21.29s > --ch : 21.13 > -o : 0.14 > input : 0.01 > unaccounted : 0.00 > Peak memory: 2.0 GB > Current memory: 2.0 GB > > > > _______________________________________________ > Oiio-dev mailing list > [email protected] > http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org > > > -- > Larry Gritz > [email protected] > > > > > _______________________________________________ > Oiio-dev mailing list > [email protected] > http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org >
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