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Hi Folks,

What's the best way to express a TIFF file that has 32-bit floating 
point, *linear* RGB data? If I do the dumb thing, then Photoshop CS3 
Extended interprets the data with a 2.2 gamma. However, ImageMagick 
seems to display the image without the gamma correction.

Looking at the TIFF 6 spec, the default TransferFunction seems to be 2.2 
gamma correction if unspecified for RGB PhotometricInterpretation? 
However, one can't easily provide a linear TransferFunction for 32 bits 
per sample data.

Thanks,
-Edward


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	LibTiff Mailing List TIFF and LibTiff Mailing List Archive February 2008 Previous Thread Next Thread Previous by Thread Next by Thread Previous by Date Next by Date Contact The TIFF Mailing List Homepage This list is run by Frank Warmerdam Archive maintained by AWare Systems	Thread 2008.02.07 15:27 "32-bit floating point RGB images (and gamma)", by Edward Lam 2008.02.08 20:44 "Re: 32-bit floating point RGB images (and gamma)", by Chris Cox 2008.02.12 03:28 "Re: 32-bit floating point RGB images (and gamma)", by Edward Lam 2008.02.07 15:27 "32-bit floating point RGB images (and gamma)", by Edward Lam Hi Folks, What's the best way to express a TIFF file that has 32-bit floating point, linear RGB data? If I do the dumb thing, then Photoshop CS3 Extended interprets the data with a 2.2 gamma. However, ImageMagick seems to display the image without the gamma correction. Looking at the TIFF 6 spec, the default TransferFunction seems to be 2.2 gamma correction if unspecified for RGB PhotometricInterpretation? However, one can't easily provide a linear TransferFunction for 32 bits per sample data. Thanks, -Edward

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2008.02.07 15:27 "32-bit floating point RGB images (and gamma)", by Edward Lam