black dot question - RAW Shooting and Processing - CHDK Forum
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black dot question

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Offline dutchie

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black dot question
« on: 10 / August / 2012, 21:25:33 »
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I am sure there is an answer here already but when shooting raw my pics have dots that look like dead pixels.
when i save the raw to jpeg they are still there  :(
is it my camera???
thanks cheers
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Offline waterwingz

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Re: black dot question
« Reply #1 on: 10 / August / 2012, 21:31:56 »
Quote from: dutchie on 10 / August / 2012, 21:25:33
I am sure there is an answer here already but when shooting raw my pics have dots that look like dead pixels.
when i save the raw to jpeg they are still there  :(
Do you mean you convert the RAW images to JPG on your computer and save them ?  Or can you see the dead pixels in the JPG imagein the camera that corresponds to your RAW image ?
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Ported :   A1200    SD940   G10    Powershot N    G16
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Offline dutchie

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Re: black dot question
« Reply #2 on: 10 / August / 2012, 21:53:27 »
the jpeg from the camera is fine.
when i view the raw image "I see dead pixels"kinda like I see dead people.LOL
when i modify the image and save a copy as a  jpeg the dots are in the jpeg.
what could i be doing wrong?
I am NEW to raw.
I also find my raws seem blurry and unfocused?


Thanks Mr.Wingz
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Offline waterwingz

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Re: black dot question
« Reply #3 on: 10 / August / 2012, 22:00:13 »
Quote from: dutchie on 10 / August / 2012, 21:53:27
the jpeg from the camera is fine.
CHDK RAW is a simply a dump of the actual information that comes from your camera's sensor. No processing, image clean-up, distortion correction, bad pixel removal or anything else that the Canon firmware does to the image before compressing it and putting it into a JPG file.  Like the name says, its RAW data.

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when i view the raw image "I see dead pixels"kinda like I see dead people.LOL
when i modify the image and save a copy as a  jpeg the dots are in the jpeg.
what could i be doing wrong?
I am NEW to raw.
I also find my raws seem blurry and unfocused?
You probably need to read a bit more about what CHDK RAW really is :

link> CHDK Wiki Page about RAW
link> CHDK Forum thread on RAW
link> CHDK Wiki Page about Raw Software
link> CHDK Forum Board for RAW
link> How do you fix lens distortion with CHDK RAW files?


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Thanks Mr.Wingz
Finally  - some respect around here  8)
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Ported :   A1200    SD940   G10    Powershot N    G16
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Offline dutchie

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Re: black dot question
« Reply #4 on: 10 / August / 2012, 22:10:45 »
 My raw data has specs.
Sorry if i am being a pain in the [admin: avoid swearing please].
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Offline dutchie

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Re: black dot question
« Reply #5 on: 10 / August / 2012, 22:22:00 »
my son just pointed out as a read your quote...bad pixel removal... duhh.
my sons nikon d5100 has no bad pixels.
is it simply something that i have to edit when i use raw...OMG there are so many dots.

I have to call you mister.you are helping me alot.
LOL
thanks again
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Offline waterwingz

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Re: black dot question
« Reply #6 on: 10 / August / 2012, 22:38:36 »
Quote from: dutchie on 10 / August / 2012, 22:22:00
my son just pointed out as a read your quote...bad pixel removal... duhh.  my sons nikon d5100 has no bad pixels.
or his nikon removes the bad pixels before he sees them .. DSLR's cost a lot more and you get something for that.

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is it simply something that i have to edit when i use raw...OMG there are so many dots.
I believe so.  There are others who hang around this forum that might have better advice for you .. for example,  if you use DNG rather than raw,  you can get bad pixel removal automatically.  Except I think that's "bright pixel" removal (hotspots) but I am likely completely wrong about that.  Hang around for 48 hour and see if someone can give you a better answer ?
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Ported :   A1200    SD940   G10    Powershot N    G16
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Offline dutchie

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Re: black dot question
« Reply #7 on: 10 / August / 2012, 22:42:54 »
Thanks again for all your help.
 :)
I will wait and see what surfaces.
Off to the toronto zoo tomorrow.
lets see how frustrated I can get.
LOL
Cheers1
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Offline waterwingz

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Re: black dot question
« Reply #8 on: 10 / August / 2012, 22:54:36 »
Quote from: dutchie on 10 / August / 2012, 22:42:54
I will wait and see what surfaces. Off to the toronto zoo tomorrow. lets see how frustrated I can get.
You probably want to be using the DNG option.
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Ported :   A1200    SD940   G10    Powershot N    G16
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Offline blackhole

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Re: black dot question
« Reply #9 on: 11 / August / 2012, 01:59:10 »
Perhaps this could be the solution of your problem,if you use RawTherapee

http://chdk.setepontos.com/index.php?topic=6634.msg88351#msg88351

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