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hardnrg

Raw Support On My Powershot A590is!

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A recent breakthrough in making custom firmware for Canon Powershot cameras that use DryOS, means that they can now run CHDK, and some clever fellow figured it out for my A590IS, so now I have RAW and live histogram, and MANY MANY more controls, including scripting support for programmed continuous bursts using different settings (useful for DOF and HDR shots)

 

I was a bit disappointed with the JPEG artifacting on this camera, but now with RAW support using CHDK "firmware", the picture quality is improved dramatically!

 

CHDK is made for Powershot cameras that use the Digic III processor, a list of supported cameras is here: http://grandag.nm.ru/hdk/autobuild/download.htm

 

Check out the difference in noise, banding, macroblocks, etc between the two images (RAW gets saved at the same time as the JPEG)

 

-------------------------------------------------------------------------------------

JPEG, Superfine (highest quality setting)

img1982450pxod9.png

 

100% crop

crw1982editedcropbl4.png

 

Full size original JPEG:

http://picasaweb.google.co.uk/steve.goosse...517314475191842

 

-------------------------------------------------------------------------------------

RAW, decoded with Lightbox using Auto Balance

crw1982450pxef0.png

 

100% crop

crw1982editedcroprawxn4.png

 

Full size (saved as PNG):

http://picasaweb.google.co.uk/steve.goosse...517276048862242

 

 

 

As of 24th Oct 2008, the latest build is 0.6.2, available for 1.00e and 1.01b versions of the A590IS: http://chdk.setepontos.com/index.php/topic...4.html#msg22934

 

How to find out the firmware version of the camera: http://chdk.wikia.com/wiki/FAQ#Q._How_can_...of_my_camera.3F

 

AFAIK, there are only 1.00e and 1.01b firmware versions of the A590IS, so it's not like you need to try this in-store lol

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Nice!.. what ISO was that shot at?

 

That Fuji I picked up (and returned) had insane noise at just 300 ISO, I might just pick up a 590IS...

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ISO 80

 

I'll have to try out higher ISO levels and see what happens... I'd expect the difference to widen as the JPEG artifacts get worse with the ISO noise, and RAW output retains a more natural film grain...

 

First post updated with CHDK info

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Obviously, there is a lot of noise in this ISO 800 shot, and I had one dim light on in the room when I took the photo, no flash... but just look at the horrendous quality (at 100% zoom on the full resolution pics) between what is supposed to be the highest quality available, and what it is actually capable of...

 

 

 

ISO 800

 

JPEG (Superfine)

img1996450pxic2.png

http://picasaweb.google.co.uk/steve.goosse...375909745857634

 

 

RAW saved as TIFF in Lightbox, then PNG in Photoshop

crw1996450pxfr9.png

http://picasaweb.google.co.uk/steve.goosse...375835273876802

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That's rather impressive!

I was looking to get a point and shoot, so maybe a Powershot is the way to go... :)

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