Re: Maximum color gamut for storage needs!
Re: Maximum color gamut for storage needs!
- Subject: Re: Maximum color gamut for storage needs!
- From: email@hidden
- Date: Wed, 11 Jul 2001 12:46:14 EDT
In a message dated 7/11/01 12:21:54 PM, email@hidden writes:
>
thanks again for your valuable feedback about this matter; what you
>
really mean for Adobe RGB highbit? I scan my files using a CreoScitex
>
EverSmart Supreme scanner and I save them in TIFF; highbit is maybe
>
referred to 48bit versus 36bits? If so when you apply that rate, at
>
the scanner level, or in Photoshop, after the scan? Maybe after the
>
scan I will already loose some info!
Scanners may actually scan in 10, 12, or 14 bits per channel (sound like 12
with yours, adding up to 36 bit total), but Photoshop will only open files at
either 8 bits/channel, or 16... so files are either dumbed down to 8 bits in
the scanning process (which isn't too bad for dirct uses, but loses some
potential for archiving) or saved in a format Photoshop sees as "high-bit" or
16 bits per channel. The confusing part is that raw hgighbit scans may just
plunk their 10 or 12 bits into Photoshop's 16 any old way, and end up with an
image that has lots of data in it but which looks virtually black on screen.
"Targeted higbit" will account for this and place the data appropriately, so
that it looks like the 8 bit/channel version would have, but with extra
(invisible, but potentially useful) bits in between the 256 levels that can
be displayed on screen.
C. David Tobie
Design Cooperative
email@hidden