Which MD scripts are the best for lightning? - Script Writing - CHDK Forum
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Which MD scripts are the best for lightning?

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Offline nkri

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Which MD scripts are the best for lightning?
« on: 16 / August / 2008, 20:39:25 »
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Hey all,

I just started with CHDK (loving it :)) and have been playing around with various MD scripts.  So far, Fudgey's script has worked the best by far, but I haven't had a chance to test it with lightning.  So my question to you is: Is Fudgey's script fast enough to capture lightning?  If not, which one do you use and could you please post it?

Thanks guys!
-nkri
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Offline grg

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Re: Which MD scripts are the best for lightning?
« Reply #1 on: 17 / August / 2008, 05:18:09 »
Never tried to capture lightning myself, but check out the lightning topics in the "creative uses" subforum, lots of people successfully using fudgey's script.
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Offline fudgey

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Re: Which MD scripts are the best for lightning?
« Reply #2 on: 17 / August / 2008, 06:26:06 »
Quote from: nkri on 16 / August / 2008, 20:39:25
So my question to you is: Is Fudgey's script fast enough to capture lightning?

For this purpose it's as fast as it can be, you'll only find scripts equally fast.

Completely outside script writing, the motion detect response time variation (and average response time along with it) was improved in CHDK recently, but I can't remember whether this modification has made it into trunk yet (and whether it's have been adapted for all models).
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Offline fe50

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Re: Which MD scripts are the best for lightning?
« Reply #3 on: 17 / August / 2008, 07:45:47 »
Quote from: fudgey on 17 / August / 2008, 06:26:06
Completely outside script writing, the motion detect response time variation (and average response time along with it) was improved in CHDK recently, but I can't remember whether this modification has made it into trunk yet (and whether it's have been adapted for all models).

It's only in JuciPhox, since changeset #429 (S5) / #431, not for all models...i found it for following cameras:

A540, A570, A610, A630, A710, A720, SD800, SD850, SD870, SD1000, S3 (all in vid_get_viewport_live_fb func in lib.c),
S5 (in motion_detector.c).
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Offline nkri

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Re: Which MD scripts are the best for lightning?
« Reply #4 on: 17 / August / 2008, 23:03:19 »
Quote from: fudgey on 17 / August / 2008, 06:26:06
Quote from: nkri on 16 / August / 2008, 20:39:25
So my question to you is: Is Fudgey's script fast enough to capture lightning?

For this purpose it's as fast as it can be, you'll only find scripts equally fast.

Completely outside script writing, the motion detect response time variation (and average response time along with it) was improved in CHDK recently, but I can't remember whether this modification has made it into trunk yet (and whether it's have been adapted for all models).

Excellent...just what I want to hear!  By the way, thanks for the wonderful script :)
-nkri

PS: how do I give you "karma?"
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Offline fudgey

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Re: Which MD scripts are the best for lightning?
« Reply #5 on: 18 / August / 2008, 12:20:58 »
Quote from: nkri on 17 / August / 2008, 23:03:19
Excellent...just what I want to hear!  By the way, thanks for the wonderful script :)
PS: how do I give you "karma?"

You're welcome... karma is upped by clicking "appalaud" on the left, but I believe you can only do that after you've posted a certain number of messages.
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Offline Anaglyphic

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Re: Which MD scripts are the best for lightning?
« Reply #6 on: 18 / August / 2008, 14:09:25 »
Not for nothing, but you also should tweak your script values. Keep your grid as coarse as possible, and mask out both the top and bottom, and even perhaps sides if no lightning strikes can occur there... no ultra-fast settings are gonna work if you've got it set so it takes 2 seconds to scan the LCD data. (without modification, the script will let you set your grid resolution way beyond what can be processed in a few milliseconds.) The good thing about lightning capture vs say face capture of passers-by (you voyeur, you!) is that the light of the bolt is so dramatically different than the background, you can  mask the top/clouds bit, and the ground bit, just "scanning" the middle, as even a cloud-to-cloud flash will bleed enough into the monitored row(s) to trigger the shutter.

When you get it dialed down, it's almost boring. :P Hit after hit after hit. I've gotten some so sharp it looks like photoshopping. Nailing 1/100th Tv captures of lightning, with a $300 toy disposable point & shoot camera, while my $2000 dSLR looks over with envy.
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Offline nkri

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Re: Which MD scripts are the best for lightning?
« Reply #7 on: 18 / August / 2008, 20:55:50 »
Quote from: Anaglyphic on 18 / August / 2008, 14:09:25
Not for nothing, but you also should tweak your script values. Keep your grid as coarse as possible, and mask out both the top and bottom, and even perhaps sides if no lightning strikes can occur there... no ultra-fast settings are gonna work if you've got it set so it takes 2 seconds to scan the LCD data. (without modification, the script will let you set your grid resolution way beyond what can be processed in a few milliseconds.) The good thing about lightning capture vs say face capture of passers-by (you voyeur, you!) is that the light of the bolt is so dramatically different than the background, you can  mask the top/clouds bit, and the ground bit, just "scanning" the middle, as even a cloud-to-cloud flash will bleed enough into the monitored row(s) to trigger the shutter.

When you get it dialed down, it's almost boring. :P Hit after hit after hit. I've gotten some so sharp it looks like photoshopping. Nailing 1/100th Tv captures of lightning, with a $300 toy disposable point & shoot camera, while my $2000 dSLR looks over with envy.

Sorry for being a newbie, but I don't know much at all about writing and tweaking scripts.  How might I go about "masking out the top and bottom?"  This is not an option on the in-camera scripting parameters.  All I can do is change the numbers of rows/columns and exclude rows (this does the exact same thing as changing the number of rows).  More specific instructions will be greatly appreciated :)

Thanks!
-nkri
« Last Edit: 18 / August / 2008, 23:51:17 by nkri »
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Offline vk2him

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Re: Which MD scripts are the best for lightning?
« Reply #8 on: 19 / August / 2008, 05:38:12 »
I used the standard Fudgey script to do this photo using default settings.. seems fast enough for me  :lol

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Offline chiptune

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Re: Which MD scripts are the best for lightning?
« Reply #9 on: 19 / August / 2008, 09:21:45 »
Quote from: vk2him on 19 / August / 2008, 05:38:12
seems fast enough for me  :lol
Are you sure you got the first lightning discharge, or any of the following ...  :lol

chiptune
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