- Written for/on: Canon A640
- Also works on: Other Canon AXXX (Not tested), A620 (tested), A590 (Camera settings: Menu->Review Off), A720 (tested ok)
EV Bracketing by Johan Van Barel (http://www.vanbarel.com)
The purpose is to create a High Dynamic Range (HDR) image from a set of images taken at different exposures.
The script takes a number of images around the selected EV setting. So if you take 3 pictures, with EV set to center and EV Step Size=3, it will take the first picture at -1EV, the second at Center EV and the third at +1EV. You can later stitch the images together with a program like Photomatix (http://www.hdrsoft.com/index.html)
This script works well on Cannon A620, but you have to set the Script shoot delay setting to at least '4' and disable the Review function.
Documentation/Help (save as a small EVBracket.txt" file to your /CHDK/SCRIPTS/ folder)
Select P mode on your Canon A640
- Number of Pics (Default=3)
- EV Step Size (1/3 EV) (Default=3)
- Initial Delay (Sec) (Default=1)
Script Code (save as "EVBracket.bas" to your /CHDK/SCRIPTS/ folder)
rem Johan Van Barel 07-07-2007 rem EV-Bracketing for Canon A640 @title EV Bracket (Select P Mode) @param a Number of Pics @default a 3 @param b EV Step Size (1/3 EV) @default b 3 @param c Initial Delay (Sec) @default c 1 if a<2 then let a=2 if b<1 then let b=1 if c<0 then let c=0 print "Pics:"; a, "Step:"; b sleep c*1000 click "erase" for n=1 to (a-1)*b/2 click "left" next n print "Pic 1 of", a shoot for s=2 to a for n=1 to b click "right" next n print "Pic", s, "of", a shoot next s for n=1 to ((a-1)*b+1)/2 click "left" next n click "erase" end