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Hello Chris and all,

Yes, I had tried to rescale using the sliders but, since all the RGB values
were all 32767 in the "Info" window in photoshop, there was no way to change
anything with that.

Anyway, as suggested, I did the changes in my program last evening,
rescaling the color values between 0 and 1 when writing the tiff file.
Then I opened the file in photoshop, and... SHAZAAAM !! it worked !!! The
image was exactly as the original. The difference is that the resulting
image is a bit washed out (lighter) than the original. 

Chris, you say that the limits don't have to be between zero and one. But
how do you specify that in the TIFF file ? Is there a specific tag I have to
use ?

Thanks again for your help and your patience.

Best regards
Axel



Chris Cox wrote:
> 
> They don't have to be between zero and one - but that is the default
> viewing
> range.
> There are adjustments to change the value ranges, and a viewing exposure
> slider to change the viewing exposure.
> 
> I mean use the adjustment named Exposure in Photoshop to scale the data.
> If that works, then you can scale it when doing your conversion.
> 
> Chris
> 
> 
> _______________________________________________
> Tiff mailing list: Tiff@lists.maptools.org
> http://lists.maptools.org/mailman/listinfo/tiff
> http://www.remotesensing.org/libtiff/
> 
> 

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