8 bits/ch vs 16 bits/ch in PS

Discussion in 'Digital Photography' started by Terry, Jan 21, 2004.

  1. Terry

    Terry Guest

    In Photoshop you can click on Image>Mode>8 Bits/Channel or 16 Bits/Channel.
    Why not always select 16 Bits/channel? Won't this give you more accurate
    color?

    --
    Terry
    Remove the rodent from my email address to reply directly.
     
    Terry, Jan 21, 2004
    #1
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  2. Terry

    dragon1964 Guest

    Because in versions prior to CS, most of the tools are disabled in 16bit
    mode.

    "Terry" <> wrote in message
    news:...
    > In Photoshop you can click on Image>Mode>8 Bits/Channel or 16

    Bits/Channel.
    > Why not always select 16 Bits/channel? Won't this give you more accurate
    > color?
    >
    > --
    > Terry
    > Remove the rodent from my email address to reply directly.
    >
    >
     
    dragon1964, Jan 21, 2004
    #2
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  3. Terry

    Tom Thackrey Guest

    On 20-Jan-2004, "Terry" <> wrote:

    > In Photoshop you can click on Image>Mode>8 Bits/Channel or 16
    > Bits/Channel.
    > Why not always select 16 Bits/channel? Won't this give you more accurate
    > color?


    A qualified yes on the more accurate color.

    Why not:
    Many file formats don't support 16 bits/color (jpeg)
    The files are twice as big
    Prior to CS, many PS tools didn't work in 16 bits/color
    Many other image manipulation programs don't work with 16 bits/color images

    --
    Tom Thackrey
    www.creative-light.com
    tom (at) creative (dash) light (dot) com
    do NOT send email to (it's reserved for spammers)
     
    Tom Thackrey, Jan 21, 2004
    #3
  4. Terry

    Tony Spadaro Guest

    If the picture is not already in 16 bpc colour, converting it will do
    nothing for the picture at all. If you scan or have a digital that uses a
    more colour depth, then use 16 bpc. Be sure to convrt to 8 bpc either after
    colour correction or before printing. 16 bit images have limitations even
    with the new Photoshop CS, and if you let the printer program do the
    conversion to 8 bit it will probably do a very poor job of it.
    Any image for the web must be in 8 bits before it can be made into a jpg.
    While you probably can send 16bpc channel images to others, they would be
    very large, and the people you send it to would need a program that supports
    16 bits to use the image.
    You won't see any difference between 8 and 16 bits on your monitor (save
    with a couple very expensive graphics monitors) so there is little point in
    sending that way - unless the person recieving the image is going to colour
    correct it.
    Here is an article on using high bit images:
    http://www.chapelhillnoir.com/mani/digi/mhibit.html
    --
    http://www.chapelhillnoir.com
    home of The Camera-ist's Manifesto
    The Improved Links Pages are at
    http://www.chapelhillnoir.com/links/mlinks00.html
    A sample chapter from my novel "Haight-Ashbury" is at
    http://www.chapelhillnoir.com/writ/hait/hatitl.html
    "Terry" <> wrote in message
    news:...
    > In Photoshop you can click on Image>Mode>8 Bits/Channel or 16

    Bits/Channel.
    > Why not always select 16 Bits/channel? Won't this give you more accurate
    > color?
    >
    > --
    > Terry
    > Remove the rodent from my email address to reply directly.
    >
    >
     
    Tony Spadaro, Jan 21, 2004
    #4
  5. Terry

    Flycaster Guest

    "Tony Spadaro" <> wrote in message
    news:nOoPb.247628$...
    [snip]
    >16 bit images have limitations even
    > with the new Photoshop CS, and if you let the printer program do the
    > conversion to 8 bit it will probably do a very poor job of it.

    [snip]

    In the case of PS, not true. PS has a built-in fail-safe (as it does when
    it won't allow you to double convert to the same profile or working space.)

    They will look exactly the same (I've tried it ~ by mistake) since, as Chris
    Cox explained, PS just dithers to 8 bit prior to sending the file to the
    printer. In other programs that are high-bit capable, however, you may be
    right.




     
    Flycaster, Jan 21, 2004
    #5
  6. Terry

    Tony Spadaro Guest

    I think it will also depend on the printer.

    --
    http://www.chapelhillnoir.com
    home of The Camera-ist's Manifesto
    The Improved Links Pages are at
    http://www.chapelhillnoir.com/links/mlinks00.html
    A sample chapter from my novel "Haight-Ashbury" is at
    http://www.chapelhillnoir.com/writ/hait/hatitl.html
    "Flycaster" <> wrote in message
    news:...
    > "Tony Spadaro" <> wrote in message
    > news:nOoPb.247628$...
    > [snip]
    > >16 bit images have limitations even
    > > with the new Photoshop CS, and if you let the printer program do the
    > > conversion to 8 bit it will probably do a very poor job of it.

    > [snip]
    >
    > In the case of PS, not true. PS has a built-in fail-safe (as it does when
    > it won't allow you to double convert to the same profile or working

    space.)
    >
    > They will look exactly the same (I've tried it ~ by mistake) since, as

    Chris
    > Cox explained, PS just dithers to 8 bit prior to sending the file to the
    > printer. In other programs that are high-bit capable, however, you may be
    > right.
    >
    >
    >
    >
     
    Tony Spadaro, Jan 21, 2004
    #6
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