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
>
>
>
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--
Larry Gritz
[email protected]
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