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dynamic range of file formats
Old 03-18-2003, 11:29 AM   #1 (permalink)
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Does anyone know which common file format stores the most grayscale information - i.e., the widest dynamic range (not necessarily the most colors, I think)? Chung Lee's recent Imacon image and his comments on the dynamic range prompts this. I got to wondering how long it would be until we have to switch formats to accomodate newer, better sensors.

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Re: dynamic range of file formats
Old 03-18-2003, 11:34 AM   #2 (permalink)
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Any 8 bit file format, JPEG, TIFF, GIF, is going to store grayscale images in 256 levels of gray.

I'm pretty sure that 16 bit file formats, like TIFF or Photoshop PSD also store grayscale images in 256 levels. HOWEVER, I'm only pretty sure, so if anyone knows better, please correct me.

--

After searching Adobe's web site, I am convinced that photoshop does all grayscale work in 24 bit (8 bits per color) mode and therefore has 256 shades of gray. I know of NO program which does more.

So, pretty much any file format should be ok.

Again, if anybody knows better, please feel free to correct me. I love being corrected.
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Re: dynamic range of file formats
Old 03-18-2003, 02:15 PM   #3 (permalink)
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John

Greyscale is by definition 8 bits so any of the file formats will store it that way.

The Fuji S2 stores b&w captures as monochromatic RGB -- which will have whatever color depth the sensor allows. Think of it like the C41 process b&w film being sold by Kodak and Ilford. In the case of RGB images, you'll have to store them as camera RAW to get the entire sensor capture. The orcessed files -- hmmm -- look up in Photoshop help which formats will take the full RGB. I think you're right in saying that JPG will not store the extended RGB -- what is that 32 bit color? 24 bit color? I'm not in front of my copy of PS right now or I'd look it up.

Bob

Lots of good color here:
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Paging Robert Sanders - - - -
Old 03-19-2003, 12:23 AM   #4 (permalink)
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The person to ask is Robert Sanders.

 
 
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