Recently i purchased Canon PowerShot S3-IS. Its a good camera but lacks raw picture format support in it. But now i find a way to get the raw support in my camera.
CHDK Firmware is now available for some Canon P&S digital cameras. This firmware hack supports the following features:
* Shooting in RAW
* Live histogram (RGB, blended, luminance and for each RGB channel)
* Zebra mode (blinking highlights and shadows)
* DOF-calculator
* Battery indicator
* Scripts execution (exposure/focus/… bracketing, intervalometer and more)
* File browser
* Text reader
* Calendar
* Some fun tools and games 
The firmware is available for the following Canon digital camera models:
* A610, Fw: 1.00D (with CHDK version for 1.00E), 1.00E, 1.00F
* A620, Fw: 1.00F ( 1.00E is not compatible. You must upgrade to 1.00F first )
* A630, Fw: 1.00C
* A640, Fw: 1.00B
* A710 IS, Fw: 1.00A
* S2 IS, Fw: 1.00E, 1.00F, 1.00G, 1.00I (with CHDK version for 1.00G)
* S3 IS, Fw: 1.00A
Just go through the CHDK FAQ will will find lot of information regarding this.
Some screenshots in action:
Main menu
Raw parameter menu
many more screen shots are there in CHDK firmware usage page.
Don’t worry it won’t do anything to your original firmware. You have to just copy CHDK firmware to the SD card, step by step configuration details are there in the CHDK faq.
Right now i am experimenting with my camera, now i know what i was missing in those photos.
