Adrian,
I just did a few more tests after getting to work and had less success than my
initial testing last night. I'm guessing that the location of the compression
flag will change, based on other header data and the space it takes up? You
had very specific index locations in your sample code. How did you determine
how far to look? Would a larger header size be more likely to work with files
that are larger and that have more channels? Sorry for the dumb questions - I
have a an intuitive grasp of how this is working, but no experience with it...
Thanks,
Rich
On May 21, 2012, at 6:40 PM, Adrian Baltowski wrote:
> Hi
> With just few lines of code and totally simplified
>
> **********************************
> compList = ['None', 'RLE', 'ZIP', 'ZIP 16 lines', 'PIZ', 'PXR24', 'B44',
> 'B44A']
>
> n = nuke.selectedNode()
> file = nuke.filename(n, nuke.REPLACE)
> fd = open(file, 'rb')
> header = fd.read(1024)
> index = header.find('compression')
> comp =ord(header[(index+28):(index+29)])
> print compList[comp]
>
> ***********************************
>
> Each exr file MUST have compression info in the header and this info is
> placed just after channels info. It's simple to get actual size of channels
> list but I quickly set 1024 bytes of a headroom.
>
> Best
> Adrian
>
>
>
>
>
> W dniu 2012-05-21 21:04:38 użytkownik Rich Bobo <[email protected]> napisał:
>
> On May 21, 2012, at 3:00 PM, Nathan Rusch wrote:
>
> The OpenEXR utilities are pretty nice to have around, especially exrheader.
> Sounds like it might be worth a look for you.
>
> exrheader /path/to/input/image.exr | grep compression
>
> Yep. I'll have a look, when I get a bit of extra time to experiment...
>
> Thanks!
>
> Rich
>
>
>
>
> -Nathan
>
>
> From: Rich Bobo
> Sent: Monday, May 21, 2012 11:53 AM
> To: Nuke user discussion
> Subject: Re: [Nuke-users] How to check zip compression type for EXR images...?
>
> Thanks, Nathan. Looks like more trouble than it's worth. I tried a down and
> dirty 'strings <path> | grep compress | more' and came up with two instances
> of the word "compression", but no other info. So, I guess I'll just use the
> "Does it take lots longer to cache?" testing method! ;^)
>
> Rich
>
>
> On May 21, 2012, at 2:37 PM, Nathan Rusch wrote:
>
> No, it isn’t.
>
> Depending on the context from which you need to check the compression scheme,
> if Python proves too unwieldy, you could also resort to
> parsing/pattern-matching the output of the exrheader executable.
>
> -Nathan
>
>
> From: Rich Bobo
> Sent: Monday, May 21, 2012 11:32 AM
> To: Nuke user discussion
> Subject: Re: [Nuke-users] How to check zip compression type for EXR images...?
>
> I found this reference and it looks like the OpenEXR module would have what I
> need, but I'm not sure if it's part of Nuke's Python installation or not...
>
> http://excamera.com/articles/26/doc/openexr.html
>
>
> Rich
>
> On May 21, 2012, at 2:24 PM, Rich Bobo wrote:
>
> Hi,
>
> Anyone know a quick way to check EXR images to see if they were saved as
> 16-scanline zips or single-scanline zips? ViewMetaData reveals nothing about
> the compression type. I'm sure there's a command line invocation that will
> show more - I just can't find it...
>
> Thanks for any help,
>
> Rich
>
>
> Rich Bobo
> Senior VFX Compositor
> Mobile: (248) 840-2665
> Web: http://richbobo.com/
>
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