Raw shots (black frame) - RAW Shooting and Processing - CHDK Forum
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Raw shots (black frame)

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Offline Mackly73

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Raw shots (black frame)
« on: 07 / April / 2009, 15:50:06 »
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This is my first topic...  :P
...so because I'm newbie and I didn't find nothing about following question.... I want to ask you if it's normal to obtain these type of photo (?).

- First photo is obtained from original DNG by chdk on my Canon SX10IS (ISO80 & 1s exposure),
- Second photo is only zoom of the first.

Is this correct result?
Are the coloured pixels noise?

Thank in advance for any reply!  :) :)


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Offline hotvedt

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Re: Raw shots (black frame)
« Reply #1 on: 07 / April / 2009, 16:30:54 »
How does the original jpeg look like, compared to theese? Can you upload a dng that we can look at? Or maybe even jpeg,
not touched by for example picasa, stright from the cam.
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Offline Mackly73

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Re: Raw shots (black frame)
« Reply #2 on: 07 / April / 2009, 16:39:13 »
Hi Hotvedt,

Original Jpeg (automatically created by chdk while create DNG) is completely black.. without coulored pixel.
So it is completely different compared to picture 1.

The picture 1 is posted in jpg (original is in DNG format but i use JPG only to reduce the 15MB original size!)
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Offline hotvedt

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Re: Raw shots (black frame)
« Reply #3 on: 07 / April / 2009, 16:42:38 »
Then i think the program you use for konverting/opening your dng's is bumping up the exposure automatically.
If i do the same with my cam, open the file in photoshop and its raw-plugin, it looks black, but if i press the "auto" button, then the result looks very much like yours.
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Offline Mackly73

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Re: Raw shots (black frame)
« Reply #4 on: 07 / April / 2009, 16:45:57 »
Ok thanks for answer. :)

I will check if the program bump up the exposure. :D :D

..... after some testing...  :blink:

The original DNG seems not increase in exposure.

« Last Edit: 07 / April / 2009, 16:59:48 by Mackly73 »
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Offline hotvedt

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Re: Raw shots (black frame)
« Reply #5 on: 07 / April / 2009, 17:37:41 »
Quote from: Mackly73 on 07 / April / 2009, 16:45:57
The original DNG seems not increase in exposure.
Then you should upload the dng somewhere.
I thought that your raw-converter maybe did some processing because of the image being very dark.
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Offline Mackly73

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Re: Raw shots (black frame)
« Reply #6 on: 10 / April / 2009, 16:21:13 »
Because I'm not conviced for previous result.. ;) ;) ...I decide to repeat some test.
The attached image is the result (JPG picture is obtained directly from original DNG). In this case there is not coulored pixel in black zone. :D :D


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