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Old Jul 7, 2003, 12:21 AM   #1
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Default What is the difference between 32 bit and 42 bit scanners?

I Just bought a new scnanner and I noticed that it is a 42 bit scanner. I am just wondering how this is better than my old 32 bit scanner and what exactly does this improve?
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Old Jul 7, 2003, 1:01 AM   #2
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10 bits. :-)

Seriously, bit depth is loosely a measure of the dynamic range (number of colors) of the scanner. 32 bit is 2^32 = 4,294,967,296 colors and 42 bit is 2^42 = 4,398,046,511,104 colors. You will probably not see any differences in the scanning quality due to the scanners bit depth. More likely, any differences in quality will be due to the quality of the scanner itself, CCD, electronics etc.

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Old Jul 7, 2003, 12:00 PM   #3
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Isnt it true that the Human eye can not distinguish between 16 bit and 32 bit colour?
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Old Jul 7, 2003, 3:05 PM   #4
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between 16 and 32 bit you can see the difference. No prob.

Higher bit depth allows for more editing in photoshop for example....
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Old Jul 7, 2003, 3:21 PM   #5
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Default Bit depth terminology

[quote="Laserjock"]10 bits. :-)
Seriously, bit depth is loosely a measure of the dynamic range (number of colors) of the scanner. 32 bit is 2^32 = 4,294,967,296 colors and 42 bit is 2^42 = 4,398,046,511,104 colors.[ /quote]

What you mean by nn-bit colour depends on your terminology.

For example Photoshop 5LE offers "8 bit per channel" and "16 bit per channel" colour. My Scanwit filmscanner claims to scan in "12 bits per colour channel", but the excellent Vuescan scanner software ( from www.hamrick.com) that I use saves by default in "24 bit" , i.e., 3x8bits per pixel, with an option for "48 bit" meaning 3x16-bits per channel, if you want to use Photoshop, which can work with such images.

With a suitably high-end output device (a very fancy printer) it's no doubt possible to see the difference, with more shades of colour available, but most other photo editing software I've seen works with and saves images only in ''8 bit" (per channel), also known as "24 bit" if you prefer.
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