Script for HDR photos

SuperSized

13

« on: 16 / June / 2008, 08:46:40 »

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Hi guys,

Could someone point me in the direction of a script I could use on my SD700 to do TV bracketing for HDR images? I would like a script which (with a delay) will take 3 or 5 images at diffferent shutter speeds. I know it's possible to do this with the CHDK AllBest build while in the continuous drive mode, but it requires the user to hold down the shutter button, thereby introducing camera movement before the shot.

Thanks,
SuperSized

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wontolla

413
S3 & G9 & A720

Re: Script for HDR photos

« Reply #1 on: 16 / June / 2008, 09:24:28 »

Have you tried one of these?

UBASIC/Scripts - CHDK Wiki

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cyril42e

111
SD1000/Ixus70 1.02a

Re: Script for HDR photos

« Reply #2 on: 16 / June / 2008, 10:28:31 »

Quote from: SuperSized on 16 / June / 2008, 08:46:40

I know it's possible to do this with the CHDK AllBest build while in the continuous drive mode, but it requires the user to hold down the shutter button, thereby introducing camera movement before the shot.

It also works with the custom timer, so you don't have to hold the shutter button.

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fbonomi

469
A570IS SD1100/Ixus80

Re: Script for HDR photos

« Reply #3 on: 16 / June / 2008, 12:01:25 »

cyril, are you sure about the custom timer? I had some problems with that... I will check again.

What I found easeir is (as setting parameters in the script menu is always a bit messy) to use the continuous mode with this simple script that just simulates shoot button being kept presed.

Code: [Select]

@title Continuous:
print ""
print ""
print "Continuous-drive:"
press "shoot_half"
sleep 3000
press "shoot_full"
gosub "waitpress"
release "shoot_full"
release "shoot_half"
print "Done..."
print ""
end

:waitpress
wait_click 
return

EDIT: Yes, the custom timer works fine, and that's by far the best solutin, also allowing to exactly pre-determine the number of shots.

« Last Edit: 16 / June / 2008, 12:23:50 by fbonomi »

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cyril42e

111
SD1000/Ixus70 1.02a

Re: Script for HDR photos

« Reply #4 on: 16 / June / 2008, 13:33:49 »

Yes it is the best solution for using continuous bracketing (and for fast bracketing), as you can reliably control the number of shots.

As far as I'm concerned, I still prefer using a script, because:
- I prefer EV-bracketing (more freedom, the camera can change ISO and Av too, and I can also have Tv greater than 1" if necessary thanks to a computation in the script)
- It is easier to configure (for continuous bracketing you have to change Ev-step somewhere, number of shots elsewhere, and enable custom timer elsewhere, so at the end it is not really faster...)
- I prefer when images are sorted according to EV shift

And for focus bracketing, a script allows to dynamically compute steps according to DOF in an optimal way.

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SuperSized

13

Re: Script for HDR photos

« Reply #5 on: 16 / June / 2008, 17:30:22 »

Quote from: cyril42e on 16 / June / 2008, 10:28:31

It also works with the custom timer, so you don't have to hold the shutter button.

What if the custom timer and the continuous drive are controlled cannot be activated at the same time? The SD700 has a button which seems to switch from normal mode, to timer, to continuous drive. Thus the timer and continuous drive cannot be activated at the same time, unless i'm missing something.

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cyril42e

111
SD1000/Ixus70 1.02a

Re: Script for HDR photos

« Reply #6 on: 16 / June / 2008, 18:24:27 »

Actually it works in continuous mode AND in custom timer mode. It's normal that you can't activate both modes at the same time ;-), just activate the custom timer mode.

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SuperSized

13

Re: Script for HDR photos

« Reply #7 on: 17 / June / 2008, 04:20:15 »

Quote from: cyril42e on 16 / June / 2008, 18:24:27

Actually it works in continuous mode AND in custom timer mode. It's normal that you can't activate both modes at the same time ;-), just activate the custom timer mode.

OK, when I put my camera in continuous drive and hold the shutter down I get 3 bracketed images. However when I try the same thing with the 2 sec timer on I get just one image