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Script for HDR photos

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Script for HDR photos
« 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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Offline wontolla

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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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Offline cyril42e

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Re: Script for HDR photos
« Reply #2 on: 16 / June / 2008, 10:28:31 »
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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Offline fbonomi

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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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Offline cyril42e

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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.

Re: Script for HDR photos
« Reply #5 on: 16 / June / 2008, 17:30:22 »
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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Offline cyril42e

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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.

Re: Script for HDR photos
« Reply #7 on: 17 / June / 2008, 04:20:15 »
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  :-[. I'm using Allbest build 50.

EDIT: Der, use the CUSTOM timer!!  :haha
« Last Edit: 17 / June / 2008, 04:23:04 by SuperSized »


Re: Script for HDR photos
« Reply #8 on: 17 / June / 2008, 04:22:30 »
Are you using the 2s timer or the custom timer [you need the custom timer]? Did you set the custom timer to take more than one image?

Re: Script for HDR photos
« Reply #9 on: 17 / June / 2008, 04:24:06 »
Are you using the 2s timer or the custom timer [you need the custom timer]? Did you set the custom timer to take more than one image?

Thanks, just worked it out right before I saw your post.

 

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