[rollei_list] Re: Scanners
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Thu, 26 Nov 2009 18:48:00 -0800
----- Original Message -----
From: "Petr Dvorak" <pdvorak@xxxxxxxxx>
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Thursday, November 26, 2009 12:30 PM
Subject: [rollei_list] Re: Scanners
Richard,
That is a common but simplified street wisdom. I think
that you may
appreciate this link better than an explanation of a TIFF
format from a
layman like me:
http://partners.adobe.com/public/developer/en/tiff/TIFF6.pdf
As for DSLR RAW files, they are literally TIFFs enhanced
with information
about camera and exposure information. Here is another
link to an unofficial
Canon CR2 file specification:
http://www.wildtramper.com/sw/cr2/cr2.html
The biggest difference between camera raws and tiffs from
a user's point of
view is the interpretation of their data. Raw files need
to go trough
demosaicing to reconstruct full color image from sensors
overlaid with color
filter arrays. Scanners do not have sensors overlaid with
CFAs hence their
raw files (tiffs) can be used directly, they are raw files
nevertheless.
Regards,
Petr
Thanks Peter, I have downloaded and saved both and will
read them over and try to make some sense of them.
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
---
Rollei List
- Post to rollei_list@xxxxxxxxxxxxx
- Subscribe at rollei_list-request@xxxxxxxxxxxxx with 'subscribe'
in the subject field OR by logging into www.freelists.org
- Unsubscribe at rollei_list-request@xxxxxxxxxxxxx with
'unsubscribe' in the subject field OR by logging into www.freelists.org
- Online, searchable archives are available at
//www.freelists.org/archives/rollei_list
Other related posts:
