Red points in DNG photo - RAW Shooting and Processing - CHDK Forum
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Red points in DNG photo

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Offline dabruna

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Red points in DNG photo
« on: 16 / October / 2012, 01:25:34 »
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Using SX10 and CHDK latest version.
Even if I obtained a good jpeg, the relative DNG photo is full of red points.
Here are the cropped part of the photos
DNG
http://www.pikky.net/uploads/53a0bc63087d896bec357f6179aa61079de38e87.jpg
JPEG
http://www.pikky.net/uploads/cbc17f83191c7702ca18d7a2335edb2244ae98b3.jpg

How to fix ?
Thanks in advance
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Offline reyalp

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Re: Red points in DNG photo
« Reply #1 on: 16 / October / 2012, 01:40:06 »
These look like badpixels that haven't been patched.  This is probably because the software you are using doesn't support DNG 1.3 badpixel opcodes. If you switch to DNG 1.2 1.1, and create badpixel.bin from the menu, this problem should go away.

If you want to fix the existing files, most Adobe tools should know what to do with the badpixels.

edit: corrected version
« Last Edit: 16 / October / 2012, 23:52:27 by reyalp »
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Offline dabruna

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Re: Red points in DNG photo
« Reply #2 on: 16 / October / 2012, 01:43:50 »
So it is not a dirty sensor problem ?
Only software problem ?
How to switch to 1.2 dng version on chdk ?
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Offline msl

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Re: Red points in DNG photo
« Reply #3 on: 16 / October / 2012, 07:51:55 »
reyalp meant version 1.1. Go into the RAW/DNG menu. There is a menu entry, in which you can select the dng version.

msl
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Offline dabruna

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Re: Red points in DNG photo
« Reply #4 on: 16 / October / 2012, 09:38:07 »
I shall try and let you know. Thanks for the moment.

But for curiosity : why 1.2 is missing ?
And what are the "changelog" from 1.1 to 1.3 ?
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Offline fe50

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Re: Red points in DNG photo
« Reply #5 on: 16 / October / 2012, 17:16:38 »
« Last Edit: 16 / October / 2012, 17:23:19 by fe50 »
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Offline dabruna

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Re: Red points in DNG photo
« Reply #6 on: 18 / October / 2012, 11:01:51 »
The "final story" for SX10 after having created badpixles is to set:
- DNG 1.3 good for develop photos with Lightroom
- DNG 1.1 for Picasa, Acdsee

Choosing instead CRW as suffix is not suggested as before photos must converted in DNG, so useless.

But ... badpixles creates the data relative to a dirty or damaged sensor ?
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Offline Pier

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Re: Red points in DNG photo
« Reply #7 on: 18 / October / 2012, 11:44:00 »
@dabruna
Every sensor have bad pixels.On my SX130IS they are 1892 bad pixel count after creation of
badpixels.bin
Your sensor is Ok, how many badpixels are there ? Some Cams have up to 20 -50000 and also are ok.
Canon Firmware take care about they, but if You processing with RAW (DNG)  this is up to You, to eliminate them.
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Offline dabruna

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Re: Red points in DNG photo
« Reply #8 on: 19 / October / 2012, 01:21:16 »
19873 badpixles on SX10, less lucky than you ... :'(
Sensor good or bad, dirty or not, this is the amletic dilemma ...
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Offline ramja

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Re: Red points in DNG photo
« Reply #9 on: 20 / October / 2012, 02:39:29 »
Quote from: dabruna on 18 / October / 2012, 11:01:51
The "final story" for SX10 after having created badpixles is to set:
- DNG 1.3 good for develop photos with Lightroom
- DNG 1.1 for Picasa, Acdsee

Also note: Photomatix (and IrfanView) do not handle 1.3 either. I was trying to figure out why Photoshop handled the bad pixels and Photomatix did not and this thread popped up right at the top of the stack! 

 

I was really shocked to see how Photomatix (above) rendered the badpixels with an "embossed scattershot" effect because I had used 1.3 .dng (Elph 310). I switched the 310 to 1.1 and Photomatix handled it perfectly just as it has in the past with my CHDKed SD770. S3 and SX30.

Quote from: dabruna on 16 / October / 2012, 09:38:07
But for curiosity : why 1.2 is missing ?
And what are the "changelog" from 1.1 to 1.3 ?

There is a 1.2 standard:
https://en.wikipedia.org/wiki/Digital_Negative_(file_format)

Thanks to all for the links that explain what is going on.
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