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RAW average: interesting examples here!

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Offline gabriele

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RAW average: interesting examples here!
« on: 20 / February / 2008, 07:01:26 »
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Hi everyone,
I would like to contribute showing to the other members of the
forum what can be done using the new RAW average feature.

I took 10 pictures in RAW manual mode with my Canon PowerShot A630
using the latest CHDK build from AllBest (#33 17 February 2008).

If you're lazy to look at the EXIF values, here they are:

Mode: Manual
ISO: 80
Shutter speed: 0"6
F/4.5
AWB
Quality: Superfine
Size: L (3264x2448)

I used a tripod to take the pictures in RAW mode, 10 in a row, merged  em using the RAW average function
built into the new CHDK version, then copied the resulting picture on my laptop and converted using DNG4PS2.
Finally I did some minor tweaks using Adobe Camera RAW to make it look more similar to the JPG conterpart.
Notice that further editing has been done in Photoshop beside the few corrections offered by Adobe Camera RAW,
the resulting picture has been saved as a JPG file with 100% quality.

You can see the results here:

- Normal JPG picture as from the camera => http://gabry.tnx.it/chdk/IMG_0222.jpg

- JPG picture resulting from the average of 10 RAW shots. => http://gabry.tnx.it/chdk/IMG_0222_media.jpg

The higher detail and lesser noise is clearly visible especially if u look in the lower right side of the picture.

Hope this has been useful.

P.S. Notice that processing 10 RAW pictures takes a while and the camera heats up a bit, but everything works fine.

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Offline PhyrePhoX

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Re: RAW average: interesting examples here!
« Reply #1 on: 20 / February / 2008, 07:17:55 »
thanks. i was wondering what i'd need that feature for. now i know. :)

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Offline gabriele

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Re: RAW average: interesting examples here!
« Reply #2 on: 20 / February / 2008, 07:45:58 »
To make it even clearer here are the screenshots of camera RAW.

The first picture is the RAW file of the single shot, the second picture is the RAW file
of the average of 10 shots, as u see noise is way less evident.
It wasn't so evident in the previous JPG picture because the camera applies
automatically denoising filters making the picture look smoother...but also with fewer details.

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EDIT:;)
I noticed I didn't use the same settings to show the 2 RAW pictures,
to be more correct now the single raw and raw average are using the
exact same settings, so you can really tell the difference.
« Last Edit: 04 / March / 2008, 12:13:27 by gabriele »

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Offline lukg

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Re: RAW average: interesting examples here!
« Reply #3 on: 20 / February / 2008, 12:54:33 »
« Last Edit: 20 / February / 2008, 13:05:13 by lukg »


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Offline gabriele

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Re: RAW average: interesting examples here!
« Reply #4 on: 20 / February / 2008, 13:01:49 »
« Last Edit: 20 / February / 2008, 13:05:41 by gabriele »

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Offline lukg

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Re: RAW average: interesting examples here!
« Reply #5 on: 20 / February / 2008, 13:09:37 »
Thanks, you've been so quick, i've had modified my prev message just to ask you to upload a single raw (check it out)
Therefore your cam allows you to take more pics in auto? why mine doesn't  :'( :'(
grazie gabriele

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Offline gabriele

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Re: RAW average: interesting examples here!
« Reply #6 on: 20 / February / 2008, 13:21:54 »
No need of uploading the huge RAW file, I've uploaded the pictures of the camera RAW window and the compression in those picture is really low, u can really tell where is the noise and where there's not.
Click on the thumbnails in my previous post, you'll surely be able to see the difference.

About multiple shots in a row just set the self shot timer, then go on the icon where u can set the customized timer, press menu and select the delay and number of shots u want to take.

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Offline lukg

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Re: RAW average: interesting examples here!
« Reply #7 on: 20 / February / 2008, 13:28:41 »
thanks, i just wanted to see the entire image (a 100% jpeg was ok too), anyway no problem!!  :)
It seems S5 have not that feature  :'( EDIT: i was wrong, i found it!  :D
« Last Edit: 21 / February / 2008, 10:59:54 by lukg »


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Offline gabriele

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Re: RAW average: interesting examples here!
« Reply #8 on: 04 / March / 2008, 12:28:59 »
I just uploaded the correct preview of the single RAW picture in my old post in this thread
Now the settings of color, sharpness and all the other
features are the same for both pictures.
You may have noticed an increased noise compared to the old picture due to the greatest
sharpness setting values, but that is the same I applied to the averaged picture
and for fairness sake I had to keep it: same settings=right way to compare pictures.

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Offline lukg

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Re: RAW average: interesting examples here!
« Reply #9 on: 04 / March / 2008, 14:27:27 »
Thanks gabry! Now differences and details are clear!
This function "on-board" is very usefull...what are the results with higher ISO (400-800 ISO)??

ps. afaik chdk allows to disable automatic noise reduction. Did you take pictures with NR on or off?
thanks
ciao!!!

 

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