Ray; Photoshop is a straight color application, and OpenEXR is defined as being premultiplied. This means that OpenEXR data has to be un-multiplied by the transparency/opacity values to work in Photoshop. To a straight color application, there is no meaning to color values when the opacity is zero. If the opacity is non-zero, then the color values are there - just un-multiplied so they will composite correctly.
Photoshop already handles the EXR "A" channel (defined in the spec as opacity/transparency data) correctly - it opens it as opacity/transparency. What the Photoshop EXR plugin does not do is give you a way to open the transparency channel as an arbitrary alpha channel, or to open channels other than RGBA. I'm sorry I don't have a solution for you, but your post sounded like you were confused about the terminology and what was happening to your data (enough so that I still don't know what's not working for you with the Photoshop EXR plugin). Chris On 6/4/09 4:23 PM, "[email protected]" <[email protected]> wrote: I'm working on a project that is rendering 32bit floating bit EXR files out of 3DStudio. I'm then compiling these frames in After Effects in a 32 bit floating point composite and it's all working fine. The problem I'm having is that I also need to composite some scenes in Photoshop CS4, and the default Photoshop EXR plugin is tossing out any data from the image that has a transparent alpha. I found the Photoshop plugin on the OpenEXR website and had hopes that it would do what I needed. Thankfully it knows how to handle the alpha channel properly, but unfortunately the plugin imports the image into a 16bit integer document and any value above 1.0 is clipped. I can't use the exposure adjustment to access the over bright details. Because of these import problems I have to run each image through After Effects and do the exposure processing there, then export an image to Photoshop. Can the maintainer of the OpenEXR photoshop plugin please recompile a new version that imports images into a 32bit document and maintain the full color range, or provide exposure controls in the plugin? Also, I could use a 64bit version of the plugin for the 64bit version of Photoshop. Thanks, Ray Collett -- ======================================================== --==-- Ray Collett --==-- Technical Director; Newlands & Company Inc. www.nc3d.com ======================================================== _______________________________________________ Openexr-user mailing list [email protected] http://lists.nongnu.org/mailman/listinfo/openexr-user
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