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#1 >8 bpp please!

open
nobody
None
5
2001-08-22
2001-08-22
Anonymous
No

More color! :)

Discussion

  • Dan Gisselquist

    Dan Gisselquist - 2001-09-17

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    user_id=326221

    I'm not sure >8 bpp is realistically possible. While the
    HP4200 scanner hardware will scan up to 12 bpp, the extra
    bits do not turn themselves into extra resolution.
    Instead, they still need to have offset/gain/gamma
    correction applied to them.

    If you correct for the offset and gain in the scanner
    hardware, the result is a 10 bpp scan.

    If you correct for gamma as well, the result is an 8bpp
    scan which is what the current software provides.

    Do you really want a 10 or 12 bpp scan, with color which is
    more distorted than the current scans?

    Dan

     
  • Nobody/Anonymous

    Logged In: NO

    Are we thinking of the same scanner here? the hp site claims
    36 bpp for the entire series, and the windows drivers
    produce output that looks >=24 bpp atleast.

     
  • Dan Gisselquist

    Dan Gisselquist - 2002-09-16

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    user_id=326221

    Oops --- my bad.

    You are correct. When I mentioned 8bpp, what I meant was 8
    bits per pixel per color and likewise for the 10 and 12 bit
    numbers. Thus the scanner hardware scans at 32 bits per
    pixel (12 per pixel per color * 3 colors = 36) and then uses
    the first two bits to compensate for gain and offset and the
    next two to compensate for gamma.

    Sorry.

    Dan

     

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