Oh that's right. Not R... A. And the reason we changed the logic was that 'A'
means something special -- alpha -- and that was causing problems in certain
contexts where the alpha channel was by design treated differently than color
channels.
Just as a bonus, here's a command line that would work no matter what the
channel names were (by renaming first):
oiiotool greyscale.tif --chnames foo --ch R=foo,G=foo,B=foo -o out.exr
> On Dec 7, 2016, at 6:00 PM, Steven Caron <[email protected]> wrote:
>
> Ah, I see... So I am on 1.6.16 and a verbose info gives me...
>
> channel list: A
>
> so now...
>
> >oiiotool greyscale.tif -ch "R=A,G=A,B=A" -o rgb.exr
>
> Thanks!
>
> On Wed, Dec 7, 2016 at 5:54 PM, Larry Gritz <[email protected]
> <mailto:[email protected]>> wrote:
> Depends on exactly which OIIO version you are using. At some point we changed
> the implied channel name (for formats like TIFF that don't actually save the
> names) of single channel images from R to Y, I think.
>
> Try:
>
> oiiotool --info -v greyscale.tif
>
> and somewhere in there you'll see the full channel list. "Y", right?
>
> So I think you will want
>
> oiiotool greyscale.tif --ch "R=Y,G=Y,B=Y" -o rgb.exr
>
> Does that do the trick?
>
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--
Larry Gritz
[email protected]
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