[magick-developers] EXR coder, C and C++

[Daniel Richard G.]

I see that the EXR coder (exr.c) makes use of OpenEXR's C-based RGBA 
library interface.

The RGBA interface imposes certain limitations, not least of which is that 
channel data can only be handled as 16-bit half-precision floating-point 
numbers. If you've compiled IM at Q32 or above, and you have EXR images 
with 32-bit FP channels, then this can be a problem---half of your data is 
being thrown away just by the file I/O.

To access EXR data without this lossiness, you have to bypass OpenEXR's 
RGBA interface and resort to the general library interface. This interface 
is available only as a C++ API.

Would there be interest in a patch that revises the EXR coder to use the 
C++ interface, so that 32-bit FP images can be read and written without the 
data being truncated into halfs, in Q32/Q64 mode?


--Daniel


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