Ender100@aol.com
Date: 07/30/03-08:26:27 PM Z
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
>
>
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