Floating Point TIFF (HDR)

selective-php / image-type

Image type (format) detection for PHP

MIT License

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Floating Point TIFF (HDR) #35

Closed odan closed 5 years ago

odan commented 5 years ago

Floating Point Tiff (HDR)

https://www.cheshireeng.com/HDReye/Downloads.html
http://chriscox.org/TIFFTN3d1.pdf

peter279k commented 5 years ago

I can help this issue.

peter279k commented 5 years ago

It seems that this image format is part of the TIFF.

It's hard to detect this image because it will return TIFF format because it also contains II or MM magic bytes in first 2 bytes of TIFF and Floating point TIFF.

odan commented 5 years ago

If the TIFF Tag SampleFormat contains the value 3 it should be a Floating Point Tiff.

https://www.awaresystems.be/imaging/tiff/tifftags/sampleformat.html
https://www.itu.int/itudoc/itu-t/com16/tiff-fx/docs/tiff6.pdf#page=80

This sample image contains 3E or 3D at the same positions. But I'm not sure if this everywhere the case.

But anyway, we can close this issue for now.