[magick-users] Re: Canon RAW and ImageMagick

[Brian Jackson]

On Thursday 03 March 2005 12:01, magick-users-request at imagemagick.org 
wrote:
> I have a bunch of Canon RAW (.CRW) format files (from 300D camera)
> which I am holding onto because I do not want to lose any original
> photo information - sort of like negatives.
>
> Within the .CRW file, there is the complete, losslessly stored RAW
> photo information, and there is an embedded JPEG. I don't want that
> JPEG - it is completely unimportant to me and takes up valuable space.
> I have hacked the firmware on my camera to force it to embed smaller
> JPEGs, but there is no way to turn that off as far as I can tell.
>
> Does ImageMagick support CRW? What do I need to compile it with to
> enable this sort of support? What are the limitations? Is there any way
> to get rid of this obnoxious embedded JPEG using ImageMagick?
> Optimally, I would like to process my entire photo collection with a
> nice command line function.

This has been posted several times, but here it is again.

dcraw:  http://www.cybercom.net/~dcoffin/dcraw/  is what you are after.

The "obnoxious embedded JPEG" that you are reffering to is the same one 
that you use when you chimp on the camera!!  (that's the preview screen 
for those who don't know what chimping is)    Not only that, but several 
application make use of the EXIF embedded thumbnail to speed up image 
thumbnail preview.

I don't know of a way to manipulate the EXIF header info on a RAW file, 
but I do use jhead (http://www.sentex.net/~mwandel/jhead/) to manipulate 
the EXIF header info for JPEGs.

brian

-- 
Brian Jackson, President
Action Athletics 
"Sports Photography for You"
http://www.ActionAthletics.com