Mapping bad pixels for DNG files - SD770 - RAW Shooting and Processing - CHDK Forum
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Mapping bad pixels for DNG files - SD770

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Offline kayec

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Mapping bad pixels for DNG files - SD770
« on: 22 / January / 2009, 12:22:33 »
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Searched around but i can't find how to map my bad pixels.  I can't shoot DNG files without doing that first.   show_bad_b.exe doesn't work either.

Thanks!
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Offline ewavr

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Re: Mapping bad pixels for DNG files - SD770
« Reply #1 on: 22 / January / 2009, 13:04:40 »
« Last Edit: 22 / January / 2009, 13:35:50 by ewavr »
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Offline kayec

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Re: Mapping bad pixels for DNG files - SD770
« Reply #2 on: 22 / January / 2009, 14:47:38 »
Thanks!  I took a 10" black exposure and ran show_bad.  It returned 40 entries.  Seams very low compared to what others are getting.
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Offline fe50

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Re: Mapping bad pixels for DNG files - SD770
« Reply #3 on: 23 / January / 2009, 14:38:11 »
Quote from: kayec on 22 / January / 2009, 14:47:38
Thanks!  I took a 10" black exposure and ran show_bad.  It returned 40 entries.  Seams very low compared to what others are getting.

kayec,
this (show_bad) is the method for the 'standard' badpixel removal function (means: 'new' bad pixels, not known by the original Canon firmware, not stored in the firmwares build-in list, you can adjust it with a threshold).

Use 'show_bad_b' to generate the list needed for the DNG support: this bad pixels are already stored in the original fw, most cameras have ~ 10.000 bad pixels there ... or do it in the camera with the badpixel.lua script.

See also the article in the wikia: Badpixel_removal.
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