Using the G11 to make 4K timelapse video. - RAW Shooting and Processing - CHDK Forum
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Using the G11 to make 4K timelapse video.

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Offline marc

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Using the G11 to make 4K timelapse video.
« on: 21 / July / 2014, 19:07:07 »
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Long time user of CHDK on the G11 here, love it thanks for all the hard work.

I thought I would share this little workflow.
Its pretty simple. I'm converting the canon raw images into DNG with adobe DNG converter, and then dropping those directly into FCPX which handles them really well.

Here is a video on the subject: (excuse the plug at the end)
https://www.youtube.com/watch?v=8YhowGLBezs

I have not tried dropping the CHDK raw images directly in. I guess it would work, am I correct that they are 10bit and the CR2 files would be more?

I shoot video and it has bought new life into my beloved G11.
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Offline waterwingz

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Re: Using the G11 to make 4K timelapse video.
« Reply #1 on: 21 / July / 2014, 19:11:52 »
Probably safer to drop CHDK DNG images (rather than RAW) directly into that workflow.
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Offline reyalp

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Re: Using the G11 to make 4K timelapse video.
« Reply #2 on: 21 / July / 2014, 22:35:08 »
Quote from: marc on 21 / July / 2014, 19:07:07
I guess it would work, am I correct that they are 10bit and the CR2 files would be more?
No, this is absolutely not correct. CHDK raw is the same bit depth as the actual sensor data. On the G11, this is 12 bit. For all practical purposes, the data in a CHDK raw or DNG should be the same as Canon raw, aside from minor differences in how bad pixels are handled.

The difference is in how the data is packaged and what metadata comes with it.

In general Canon raw with will probably give you better results out of the box, because software that supports it will be able to output exactly as Canon intended. With CHDK DNG, the color and lens correction may need to be tuned in your workflow.
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Offline marc

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Re: Using the G11 to make 4K timelapse video.
« Reply #3 on: 22 / July / 2014, 02:11:08 »
Ah, I read somewhere here that the CHDK DNGs were 10bit. correct except the cameras that already shoot raw. 
Thanks for clarifying that.

I've already been messing with turning off the dark frame subtraction. Finding that has opened up a whole new word for astro. However I have discovered that there seems to be some light leakage internally (a big glow top left) on really long exposures. Guessing all the leds in the dials, or perhaps the little leds in the lens mechanism that are used for position sensing.

Is it possible to turn those dial leds off?

I will try the CHK DNGs in that workflow, thanks.
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Offline waterwingz

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Re: Using the G11 to make 4K timelapse video.
« Reply #4 on: 22 / July / 2014, 08:21:20 »
Quote from: marc on 22 / July / 2014, 02:11:08
Ah, I read somewhere here that the CHDK DNGs were 10bit. correct except the cameras that already shoot raw. 
Thanks for clarifying that.
After many years, there is unfortunately a lot of old CHDK documentation out there. Some of it is obsolete and some of it is just plain wrong.

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I've already been messing with turning off the dark frame subtraction. Finding that has opened up a whole new word for astro. However I have discovered that there seems to be some light leakage internally (a big glow top left) on really long exposures. Guessing all the leds in the dials, or perhaps the little leds in the lens mechanism that are used for position sensing. Is it possible to turn those dial leds off?
Its most likely not the LED's  What you are seeing is called "amp glow".  Google it and/or search this forum - it''s been discussed many time before - way back to 2007 in fact.

http://darkerview.com/CCDProblems/ampglow.php

http://chdk.setepontos.com/index.php?topic=94.0
http://chdk.setepontos.com/index.php?topic=10484.msg103532#msg103532
http://chdk.setepontos.com/index.php?topic=8865.msg92604#msg92604
http://chdk.setepontos.com/index.php?topic=5691.msg89858#msg89858

http://www.dpreview.com/forums/thread/3076639
http://www.dpreview.com/forums/thread/2176132
http://www.iceinspace.com.au/forum/archive/index.php/t-93967.html
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I will try the CHK DNGs in that workflow, thanks.
As reyalp said, the Canon CR2 files might be more compatalbe with some PC software but it looks to me like the DNG files would save you a step ( the CR2 to DNG conversion ) in your workflow.
« Last Edit: 22 / July / 2014, 08:28:51 by waterwingz »
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Offline marc

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Re: Using the G11 to make 4K timelapse video.
« Reply #5 on: 22 / July / 2014, 11:50:05 »
Ah, 'amp glow'. All about the terminology.

Thanks for putting those links up for me, it sent me on quite a few hours of reading. That darker view site has some great information buried in it.
Now I want to make some time-lapses to film noise and cosmic rays. Amazing how much fun you can have with your lens cap on. I'm going to see how the G11 compares to the EOS-M seeing as I use both for astro.

Thanks again. Marc.
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