Multiplier attribute

Hi,

Is there a way to specify a float multiplier attribute when writing an
image, that would be recognized natively by the library when reading, or
which is widely supported by most programs?

Why do I need this? I have to store in an EXR file data from an imaging
device which is producing 16-bit int images and a floating-point global
multiplier.

So the possible options are:
 - Store the image as float with lossless compression, but the size is then
slightly larger than original short int data.
 - Store the image as float with lossy compression, but the customer will
complain about loss of information
 - Store the image as half-float, but then some precision is lost

So I would like to store the image as 32bit uints, which gives a better
size than original data with zip compression (as the 32 bit ints have at
least two zero in most significant bytes, and redundancy in the next one),
but I miss the float multiplier then.

I would like to convince my client to store as EXR files instead of his
proprietary format, but for this I must prove him that the result is at
least as good as before!

Best regards,

Etienne

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