> Date: Thu, 4 Jan 2001 01:02:49 -0000
> From: "Bob Talbot" <[EMAIL PROTECTED]>
> Subject: Re: EOS 1.6x multiplier of D30
>
> > Canon's zoombrowser can't do anything with RAWs
> > other than convert them to a TIF and you go from
> > there. The RAWs are about 2.5 MB files, the TIFs
> > are 9 and can zip to 6MB.
The RAWs are somewhere between 2.5 and 3.4 MB
plus a thumbnail of somewhere between 9 and 15 KB.
Unpacked TIFFs are either 8.9 or 8.91 MB in size,
depending on orientation.
> I think it would be a relatively trivial exercise to
> extract the data, given some background to the file format.
Since canon does not give any background, the problem
is not as trivial.
> Presumably RAW is just the real image (that is what
> the name suggested.
It is a lossless compressed raw data set from the
sensor plus information of preset color balance,
right.
> But if the image actually only amounts to 2.5Mb of
> real data is seems a trifle dumb converting it to
> a 9 Mb RGB tiff when storage is at a premium (bearing
> in mind that any software manips that can be done in
> camera can just as easily occur in a PC/Mac later.
Those 8.9 MB are uncompressed. Tiffs will most assuredly
be readable for a long time to come, but that is not
so sure for any compression algorithm.
> After all: all they are really doing is guessing the
> missing colour information form the monochrome
> RGBG pixel groups (?)
They also allow you to save in lossy compression
and they allow you to reassign white balance including
custom white balance.
--
Michael Quack <[EMAIL PROTECTED]>
http://www.photoquack.de
Verkaufe: Canon Speedlite 540 EZ, 440 DM;
Canon Speedlite 200 E, 70 DM
*
****
*******
***********************************************************
* For list instructions, including unsubscribe, see:
* http://www.a1.nl/phomepag/markerink/eos_list.htm
***********************************************************
