- Posts: 97
- Joined: Tue Jul 15, 2014 10:24 am
Iliah Borg wrote:Dear Andrea,
Sorry for the late answer. White level is set close to the linearity limit in highlights, it does not depend on the light but only on the sensor design. Setting the black level is like saying "this is the mark on the bucket, and if the water is on the mark we consider it to be full". However the is sample variation between sensors, so in certain cases even a conservative setting for white level may be too high. The way to avoid the issue is a combination of tighter quality assurance, quality control, individual sensor calibration at the factory, self-calibration in camera. The cost involved is pretty substantial. If the manufacturer understand the issue they may allow the end user to set/adjust the white and black levels.
Thank you for the explanation!
I hope in a firmware update to set the white and black levels.
Meanwhile Exiftool is a good workaround and i am able to use Highlight Recovery without pink grid noise.
You can use Exiftools directly as command line and if you are using a Mac i wrote a very simple applet:
http://andreamonzini.com/files/WhiteLevelTool_BM.zip
This is source code section to open the terminal and set the Whitelevel value:
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tell application "Terminal"
reopen
activate
set results to do script "exiftool -v3 -IFD0:WhiteLevel=" & "" & white & " -ext dng -overwrite_original -r" & " " & theFolder
end tell
I use this Applet as an exiftool GUI solution to set the WhiteLevel.
But of course you can use directly the command line like for example:
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exiftool -v3 -IFD0:WhiteLevel=25000 -ext dng -overwrite_original -r /Users/iMac/Raw*
*Folder Path Example
Where:
-v[NUM] (-verbose) Print verbose messages
-IFD0:WhiteLevel= Set Value for WhiteLevel
-ext EXT (-extension) Process files with specified extension
-overwrite_original Overwrite original by renaming tmp file
-r (-recurse) Recursively process subdirectories
Please check ExifTool website for the use and documentation:
http://www.sno.phy.queensu.ca/~phil/exiftool/
Anyway i contacted Blackmagic support and i hope that this workaround will be soon not necessary to recovery highlights without the risk of Pink grid noise.