Go Back   Steve's Digicams Forums > Digital Cameras (Point and Shoot) > Casio

Reply
 
Thread Tools Search this Thread
Old Feb 14, 2005, 3:43 AM   #1
Junior Member
 
Join Date: Feb 2005
Posts: 26
Default

It seems that Casio EX-Z55 through hidden menu can generate RAW files, however I don't know how to open such files as they are quite larger than they should be. Any ideas?
big_ipaq is offline   Reply With Quote
Sponsored Links
Old Feb 14, 2005, 4:30 AM   #2
Gic
Junior Member
 
Join Date: Jan 2005
Posts: 13
Default

Normally, you must figure out the image dimensions (i.e. number of pixels, it could be a little larger than the processed one) and the number of bits per pixel. The image can be opened in Photoshop using the RAW import and then it must be de-bayerized using a special filter.
I tried myself some settings but didn't find a working one. I think the image is not 8 or 16 bit/pixel but rather 12 bit/pixel (2560 x 1920 x 12 / 8 = 7.372.800 and the RAW is 7.753.344) so we must find another way to open it...
Gic is offline   Reply With Quote
Old Feb 14, 2005, 4:38 AM   #3
Junior Member
 
Join Date: Feb 2005
Posts: 26
Default

What exactly is Bayer and associated de-Bayer filter?
big_ipaq is offline   Reply With Quote
Old Feb 14, 2005, 4:45 AM   #4
Gic
Junior Member
 
Join Date: Jan 2005
Posts: 13
Default

I think the correct setting for the EX-Z55 RAW file is:
3904 bytes x 1986 rows, meaning 2602 x 1986 pixels (12 bit/pixel) + 1 byte per row.
I will try to modify dcraw to suport this setting.
Gic is offline   Reply With Quote
Old Feb 14, 2005, 5:00 AM   #5
Junior Member
 
Join Date: Feb 2005
Posts: 26
Default

What is dcdraw? I only have photoshop to open the RAW files, can you update me a bit on dcdraw and bayer and de-bayer filters
big_ipaq is offline   Reply With Quote
Old Feb 14, 2005, 8:51 AM   #6
Gic
Junior Member
 
Join Date: Jan 2005
Posts: 13
Default

Dcraw is a free utility but it must be updated. I need some help with it because I don't know anything about the pre_mul parameters. If someone can help us, please share your expertize.
Gic is offline   Reply With Quote
Old Feb 17, 2005, 9:38 AM   #7
Gic
Junior Member
 
Join Date: Jan 2005
Posts: 13
Default

Lacking any description of these parameters I compiled a version of DCRAW without setting them. I think they control the correct white level of the specific CCD. So, using the default values will lead to images with somehow distorted colors.
Anyway, please test it and let me know your comments.
DCRAW can be used to convert the RAW image into portable bitmap format (ppm). You can open or convert it with IrfanView, for example.
Usage: dcraw <filename>.RAW
Regards...
Attached Files
File Type: zip DCRAW.zip (84.2 KB, 274 views)
Gic is offline   Reply With Quote
Old Feb 17, 2005, 9:45 AM   #8
Junior Member
 
Join Date: Feb 2005
Posts: 26
Default

Works great, even it is somehow slow. The colors are quite out of range and it looks as if they have a greenish tint.

What next?

big_ipaq is offline   Reply With Quote
Old Feb 17, 2005, 10:02 AM   #9
Gic
Junior Member
 
Join Date: Jan 2005
Posts: 13
Default

Next? Contact Dave Coffin (http://www.cybercom.net/~dcoffin/index.html), post somewhere a correct RAW image
(he says in his page:
"Does dcraw work with my camera?
Most likely, yes. The cameras listed below are supported. If your camera is not on the list, try dcraw anyway. If it doesn't work, post a raw image to a website and e-mail me the URL. If you don't have a website, use dropload.com.
Ideally, your sample image should show a standard white card or color chart in direct sunlight, with other colors in the background.")
and ask him if he's willing to analyze it and update dcraw.c with more correct settings.
Gic is offline   Reply With Quote
Old Feb 17, 2005, 10:23 AM   #10
Junior Member
 
Join Date: Feb 2005
Posts: 26
Default

So, we should wait for the sun and buy a white postcard then, right?

:blah:
big_ipaq is offline   Reply With Quote
 
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -5. The time now is 7:10 AM.