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Float PPM image file format?

I've found a PPM image with the header starting with PF (instead of standard P6, P5, P4, ... signatures). The resolution number is stored in floating point (-1.000). No comments are inserted to get how it was produced.

Because the resolution, I derived that开发者_运维百科 each pixel is composed by 12 bytes (4 bytes per component)... I suppose they are float or integer numbers.

The problem is that I cannot get a clear image. Someone has already found this kind of images?


Perhaps, having a look at the open source FreeImage might help you. As it has wrappers for different languages, this looks like a worthwhile shot at this, as you have not stated the programming language specifics, I thought this may be the neutral solution for you...


Portable Float Map HDR Shop description.

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