2008.09.07 23:18 "[Tiff] SAMPLEFORMAT_IEEEFP", by acanicio

2008.09.10 20:46 "RE: [Tiff] SAMPLEFORMAT_IEEEFP", by acanicio

The info palette reads out exact values from the file, unaffected by any display transforms. (so if you change the display exposure, the values still read out the same).

If you want to see the floating point values in the info palette, set the readout to show 32 bit values (right now you have 16 bit values showing). Apparently you missed the documentation on how to use the Info palette.

The loss of contrast could be due to gamma encoding (32 bit data in Photoshop is always gamma 1.0), or a problem with your display profile (since Photoshop always converts from the document profile to your display profile for accurate image viewing).

The TIFF file has no limits specified, it just provides the data.

The zero to one range for viewing is just a default, and a convention found in many HDR images.

Chris

Chris,

Yes, I only saw later on that I could switch the "info" window to floating point values. Thank you.

I'm trying to set some other tags, in order to enhance compatibility with some specific software I use.

For example I have to set the both TIFFTAG_SMINSAMPLEVALUE and TIFFTAG_SMAXSAMPLEVALUE to some specific values.

The setfield method seems to work, but when I open the file with AsTIffTagViewer, both values stay at 0, even if I set TIFFTAG_SMAXSAMPLEVALUE to 1 or any other value.

Any idea about this issue?

I have the same problem with TIFFTAG_XRESOLUTION and TIFFTAG_YRESOLUTION. I can set any value I want. When I read the file back, the values are 0.

Thank you again.

Best regards
Axel

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