[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


On Thu, Nov 26, 2009 at 3:16 PM, Richard Knoppow <dickburk@xxxxxxxxxxxxx>wrote:

>
> ----- Original Message ----- From: "Austin Franklin" <
> austin.franklin@xxxxxxxxxxx>
>
> To: <rollei_list@xxxxxxxxxxxxx>
> Sent: Wednesday, November 25, 2009 5:42 AM
>
> Subject: [rollei_list] Re: Scanners
>
>
>
>    I am puzzled, I thought TIFF was compressed using non-lossy compression
> so that the original data could be recovered without change (unlike JPEG)
> and RAW was, as the name implies, the data coming from the camera or scanner
> in completely uncompressed form. Is this wrong?
>
> --
> Richard Knoppow
> Los Angeles, CA, USA
> dickburk@xxxxxxxxxxxxx
> ---
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