From: epona (acolyta@napc.com)
Date: 07/31/03-10:24:30 AM Z
Thanks, Mark, that was very helpful. I did not know printers would
convert back to rgb and then to cmyk again. That seems sort of silly.
I may just try re-scanning this image.
Thanks,
Christine
Ender100@aol.com wrote:
> No, in 16 bit mode you have potentially 2 to the 16th power tones
> (65,536) instead of 2 to the 8th power tones (256) — that is if it is
> captured at that bit depth. If your capture device is only capable of
> 8 bit grayscale or 24 bit color (3 channels x 8 bits) then your best
> bet is to capture the image in color mode, convert ot 16 bit in
> Photoshop immediately, then use the Channel Mixer to convert the image
> to Grayscale at 16 bit. THis will give you a rich 16 bit file in
> grayscale.
>
> Never scan in CMYK mode ... Always scan in RGB 16 bit or Grayscale 16
> bit mode. CMYK is used in the printing industry. Each time to
> convert from RGB to CMYK or in the opposite direction you lose data.
> Most color work in Photoshop for photographers and when printing to
> inkjet printers is done in RGB mode. Even though an inkjet printer
> PRINTS in CMYK mode, if you send a CMYK File to an inkjet printer from
> Photoshop, it is expecting an RGB file, so the printer driver first
> converts it BACK to RGB before printing it, so your file gets degraded
> one more time.
>
> If you are capturing images with a digital camera, then use RAW mode
> if you have it—that will usually be 16 bit color. Don't use any of
> the grayscale or sepia settings—they will degrade the image. Just use
> RAW mode in RGB, or if you do not have a RAW mode, use RGB color at
> 8bits per channel and convert as mentioned above.
>
> If your camera allows you to also set a color space, use Adobe 1998 as
> the colorspace instead of Srgb—and do the same in your Photoshop Color
> Setup.
>
> Good Luck!
>
> Mark Nelson
>
>
>
> In a message dated 7/30/03 7:04:05 PM, acolyta@napc.com writes:
>
>
>> Hi Mark,
>>
>> Do I not only potentially have 256 tones since it is a grayscale image?
>> Should it have been scanned in CMYK?
>>
>> Thanks,
>> Christine
>>
>
>
--
The animals of the world exist for their own reasons. They were not made for humans any more than black people were made for white, or women created for men.
~ Alice Walker
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