Timelapse and saving in-camera to DNG - RAW Shooting and Processing - CHDK Forum
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Timelapse and saving in-camera to DNG

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Offline zcream

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Timelapse and saving in-camera to DNG
« on: 04 / November / 2009, 01:36:51 »
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I was hunting the forums to find a HOWTO for this, but did not end up finding one.
Basically, I want to run a timelapse and save as a DNG in the camera. I guess the workflow is

1. Start script
2. Take picture
3. Save RAW and JPEG
4. Let camera convert to DNG
5. Delete the redundant RAW and JPG
6. Sleep
7. Goto 2.

My problem is that I'm not sure of how to do Steps 4. and 5.

I have Powershots S2IS, A570IS, A450 and A460. So I can use either.
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Offline reyalp

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Re: Timelapse and saving in-camera to DNG
« Reply #1 on: 04 / November / 2009, 02:22:15 »
If you set the camera to record DNG (in the CHDK raw menu, AFAIK there's no script command for this), it will record DNG instead of RAW. No need for 4.

5) can be done from lua with os.remove(), but the jpeg is so much smaller than the DNG, you could also just leave it in the card. Jpeg size/quality settings will not affect DNG, so you could set it to 640x480 low if you wanted the extra space.
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Offline zcream

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Re: Timelapse and saving in-camera to DNG
« Reply #2 on: 04 / November / 2009, 02:44:28 »
Hi reyalp. Do I understand that if set the camera to save to DNG, it will save DNG and JPG and no redundant RAW ?
Do I need to turn on anything else besides the DNG option ?
Thanks!
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Offline reyalp

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Re: Timelapse and saving in-camera to DNG
« Reply #3 on: 04 / November / 2009, 03:14:04 »
Quote from: zcream on 04 / November / 2009, 02:44:28
Hi reyalp. Do I understand that if set the camera to save to DNG, it will save DNG and JPG and no redundant RAW ?
Correct. DNG save DNG instead of raw. Just one is slow enough, both would be :o
Quote
Do I need to turn on anything else besides the DNG option ?
No. A possible source of confusion is that DNG will not have a .DNG file extension unless you select that option. It will use whatever you have selected for raw instead.
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Offline zcream

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Re: Timelapse and saving in-camera to DNG
« Reply #4 on: 04 / November / 2009, 03:22:45 »
Cool. And if I understand it right, DNG includes the camera profiles information while RAW does not. Is that correct ?
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Offline reyalp

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Re: Timelapse and saving in-camera to DNG
« Reply #5 on: 04 / November / 2009, 03:34:03 »
Quote from: zcream on 04 / November / 2009, 03:22:45
Cool. And if I understand it right, DNG includes the camera profiles information while RAW does not. Is that correct ?
Yes, but keep in mind that the in camera DNG may not be well calibrated on all cameras.
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Offline zcream

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Re: Timelapse and saving in-camera to DNG
« Reply #6 on: 04 / November / 2009, 03:43:43 »
Hmm. I am using a Powershot A570IS. Is there any study or a FAQ that indicates which cameras would be better for a DNG, and which ones not ?

If I get an incorrect camera profile, is it worse than using CRW or CR2 ? I guess I could strip out the profile and then the data is more or less equivalent.
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Offline reyalp

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Re: Timelapse and saving in-camera to DNG
« Reply #7 on: 04 / November / 2009, 03:48:25 »
Quote from: zcream on 04 / November / 2009, 03:43:43
Hmm. I am using a Powershot A570IS. Is there any study or a FAQ that indicates which cameras would be better for a DNG, and which ones not ?
No. You can look for threads about that camera, or in http://chdk.setepontos.com/index.php/topic,390.0.html

Or just look and see if it produces good results with your particular workflow.
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If I get an incorrect camera profile, is it worse than using CRW or CR2 ? I guess I could strip out the profile and then the data is more or less equivalent.
It has all the same data, you can adjust it as you wish.
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Offline zcream

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Re: Timelapse and saving in-camera to DNG
« Reply #8 on: 04 / November / 2009, 04:20:31 »
So the DNG does not offer any more info than the CRW, its only a way of saving time and effort in converting CRW to DNG in post. DNG4PS has the same camera profiles.
Is that right ?
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Offline Microfunguy

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Re: Timelapse and saving in-camera to DNG
« Reply #9 on: 04 / November / 2009, 06:05:26 »
Before you start playing with hundreds of time-lapse images, I suggest you take a few so-called raw images and decide if the effort is worth it, when comparing the results to JPG's at the FINE setting.
Bear in mind, your images would not normally be at the camera's highest resolution, maybe only 1600x1200 reduced to 800x600.

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