Fundamentally, I think the problem is with ImageSpec::default_channel_names ()
(in src/libOpenImageIO/formatspec.cpp). There's an assumption that if channels
aren't named (hello, TIFF) and there's only one channel in an image, it will be
"A" in the absence of any other information. I dunno, maybe that's a bad
assumption, but nobody every complained before.
oiiotool --chnames can be used after the fact to rename channels. If you don't
want that extra step, we could probably put a similar option in maketx directly.
Yes, we would welcome the patch you describe (or any other).
-- lg
On Apr 2, 2013, at 12:25 AM, Matt Chambers wrote:
> Yeah, pretty much. The input image is 1 channel, I need it to go into R, not
> A...an internal thing. I've poked around the code a bit but I can't tell
> where its happening. I'd be happy to add an option if you can point me to
> the right place.
>
> Also, somewhat related, my colleagues have been using (or trying to use) a
> lot of the optimization options like monochrome-detect and opaque detect, but
> there is actually a few other checks maketx does before enabling those
> options. Can I push you a patch where in verbose mode it would tell you if
> those things were ignored because they conflicted with another option or the
> number of channels in the source image was too high?
>
> -Matt
>
>
> On Tue, Apr 2, 2013 at 1:00 PM, Larry Gritz <[email protected]> wrote:
> Sorry, I'm not 100% sure I understand the situation. How many channels are
> in the input image? Just 1 channel? And the problem is simply that the
> resulting EXR ends up with a channel named "A" but you want it named "R"? Or
> am I not understanding?
>
> -- lg
>
>
> On Mar 31, 2013, at 6:08 PM, Matt Chambers wrote:
>
>> My initial description might have been confusing. My source is just a
>> monochrome tiff, I need to make it an EXR texture with the data in the red
>> channel. I can shuffle the data in there on my own with another script, but
>> I'd like it to work with a single maketx command.
>>
>>
>> On Mon, Apr 1, 2013 at 1:44 PM, Matt Chambers <[email protected]> wrote:
>>
>> I'm using maketx on a monochrome image with alpha (all white). The resulting
>> EXR image has all the data copied into the alpha channel. What I really need
>> is a single channel EXR with the data in the red channel. Is there a way to
>> override this?
>>
>> -Matt
>>
>> _______________________________________________
>> Oiio-dev mailing list
>> [email protected]
>> http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org
>
> --
> Larry Gritz
> [email protected]
>
>
>
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>
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--
Larry Gritz
[email protected]
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