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Creating a 16-bit file

Oct 30, 2013 10:31 AM

I am working on translating EXRs into 16-bit PSD files.  I have a PSD that was created by opening an EXR using ProEXR, converting it to 16-bit, then saving it out as a PSD.  Here are some questions I have:



A) After the 4-byte length of the layer and mask section, there are eight bytes of 0, followed by 8BIMLr16.  This comes before the layer info blocks.  The file format doc mentions this id in association with PSBs but does not go into detail.  What is this?



B) After the layer info blocks, it goes directly to the tagged info.  There is no global mask info, not even a zero count.  Is this normal?  Does Photoshop check for the global layer mask section by checking for 8BIM after the layer info?



C) Does Photoshop ever store floats for 16 bit images, or will I need to convert my EXR halfs to integers?



Thank you very much!


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