Request: Exposure Bracketing Script - Script Writing - CHDK Forum
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Request: Exposure Bracketing Script

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Offline CyberianIce

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Request: Exposure Bracketing Script
« on: 10 / August / 2010, 16:15:41 »
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Hello again, this time I need a simple script. All this script should do is to cast various number of shots, each with different EV value. Number of shots and EV step between each shot should be possible changed by script config. Also I need delay before first shot (not between each shot) as an option, which can be used when shotting from tripod. Why I need this? Because each time I try to make an HDR image, i slightly move camera when changing EV and do shooting even if it's on a tripod.

Basically, I need script which will cast 5 shots with different EV: -2EV, -1EV, 0EV, +1EV and +2EV, just 5 seconds after i press the button on my PowerShot A560 (Digic 3) camera. If there is any working solutions, please let me know, i was unable to find any.
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Canon PowerShot A560 + CHDK
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Offline PS

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Re: Request: Exposure Bracketing Script
« Reply #1 on: 10 / August / 2010, 19:13:35 »
Set bracketing parameters in CHDK menu and continuous drive mode:
Code: [Select]
@title
@param a #shots
@default a 2
@param b sec delay
@default b 1
sleep 1000*b
C=get_exp_count+a
if C>9999 then C=C-9999
press "shoot_full"
do
until get_exp_count=C
release "shoot_full"
end
BTW with CHDK you can cover that range with just 2 shots. Why you take so many redundant shots?
« Last Edit: 10 / August / 2010, 19:17:56 by PS »
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Offline jimbowattz

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Re: Request: Exposure Bracketing Script
« Reply #2 on: 11 / August / 2010, 00:00:54 »
Quote from: PS on 10 / August / 2010, 19:13:35
BTW with CHDK you can cover that range with just 2 shots. Why you take so many redundant shots?

Would you mind clarifying this statement?  I thought you ideally needed 5 images for HDR?  Thanks
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Offline fe50

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Re: Request: Exposure Bracketing Script
« Reply #3 on: 11 / August / 2010, 01:07:24 »
Quote from: CyberianIce on 10 / August / 2010, 16:15:41
Basically, I need script which will cast 5 shots with different EV: -2EV, -1EV, 0EV, +1EV and +2EV, just 5 seconds after i press the button on my PowerShot A560 (Digic 3) camera. If there is any working solutions, please let me know, i was unable to find any.
This can be done scriptless, just with the CHDK settings, using the cameras custom timer mode
(set to 5s delay & 5 shots) with CHDK bracketing in continuous mode (set to 1 Ev, +/- direction) ;)

Quote from: fe50 on 15 / August / 2008, 12:08:39
Enter <Alt> mode with PRINT, enter CHDK menu with MENU, set up wat you want...
--> set "TV bracketing value" to [1 Ev], "Brackting type" to [+/-], exit Alt mode, use the custom timer (set up to 5s delay, 5 shots)
« Last Edit: 11 / August / 2010, 01:09:14 by fe50 »
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Offline PS

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Re: Request: Exposure Bracketing Script
« Reply #4 on: 11 / August / 2010, 13:00:56 »
Downside of that scriptless method is bigger lag between shots.

@jimbowattz
Ideally, if you capture absolutely static scene then you have freedom of taking any number of shots (even then I wouldn't bother with steps smaller than 3 stops). As hardly anything is static for long, then you have best chance of capturing the same scene with least number of shots.
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