[HUG ] Re: IMG: Triptych
I have a epson V700 and a minolta scan multi II and they both save in raw format using Viewscan and infact you can save as raw from any scanner with viewscan, Maybe you should check it out at www.hamrick.com . I've also used it with a polaroid sprintscan 45. I can get a 48bit multi-pass scan from all of these scanners. Of course they need to be saved as raw files or you loose information in conversion to a tiff file format. 

Franc
----- Original Message ----- From: "Austin Franklin" <austin.franklin@xxxxxxxxxxx> 
To: <hasselblad@xxxxxxxxxxxxx>
Sent: Tuesday, March 17, 2009 4:48 PM
Subject: [HUG ] Re: IMG: Triptych



Hi Franc,


I think the point he is trying to make is that when you scan or
capture if
you save it in Raw you get what the sensor saw at the time and if
you save
it to a tiff, dng or some other format you discard some of the
data.
Sure, but that is not true with TIFF when talking about a scanner, which is 
what I was questioning.


tiff
is a lossless format when opened but some of the data (not needed by the
tiff file format)is stipped off the file before it is saved
Like what data? If any data is "stripped" that is implementation dependant. 
I have a few scanners that save TIFF, and that is THE raw data format for
these scanners.  These TIFFs are typically called "HDR" for High Dynamic
Range.  IOW, they have no setpoints or tonal curves applied...so the image
you see if you were to open the file up in, say, PS, will be typically very 
dark...until you apply setpoints and tonal curves to "normalize" it.


...so
the tiff file
does not contain all the data the sensor saw but a raw file does
contain all
the data the sensor saw and nothing else, not even a color space profile.
Well, that's not necessarily true. At least with the scanners I've designed and the ones I have. To save a "raw" file with any of my scanners, you save 
it as a TIFF file, with no setpoints or tonal curves set.  TIFF does not
define a "color space profile".
What scanner do you have that saves files as "raw" and it's not HDR or TIFF? 

Regards,

Austin


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