Re: Apply color transformation on images containing a single channel


Jeremy Selan <jeremy...@...>
 

If your image is packed separately per channel (ex:  RRRRRRR... GGGGG... BBBB.... ), the Planar ImageDesc is probably what you're looking for. Give that a try?


PlanarImageDesc(float * rData, float * gData, float * bData, float * aData,
                        long width, long height,
                        ptrdiff_t yStrideBytes = AutoStride);

Note that the float * for alpha is optional, so if you are only loading RGB you can pass a NULL ptr for that.

-- Jeremy




On Wed, Apr 10, 2013 at 8:36 PM, Mark Boorer <mark...@...> wrote:
Hi,

In my application, images are split into their separate channels, and operations are performed per channel. I have individual float arrays for each channel (obtained via openimageio), and I would like to perform a colorspace transformation to each, preferably without joining them together.
I noticed that the PackedImageDesc docs say it ignores channels > 4, is there an easy way in the c++ library to provide a float array, and specify which channel it contains to perform the transformation?

Something like:

OCIO::PackedImageDesc img(data, w, h, 1, "R");

Thanks,
Mark

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