Powershot A720 raw colors

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Re: Powershot A720 raw colors
« Reply #10 on: 14 / April / 2012, 14:11:30 »
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(dng4ps2 doesn't seem to work, colors are still as off as with direct crw).
Did you try this :
http://code.google.com/p/dng4ps2/wiki/HowToCalculateCM
more info for  DIY version here :
http://chdk.setepontos.com/index.php?topic=7487.msg80234#msg80234
« Last Edit: 14 / April / 2012, 14:14:44 by waterwingz »

Re: Powershot A720 raw colors
« Reply #11 on: 11 / May / 2012, 03:58:42 »
I have sent a message to dng4ps2 developer few days after your reply but i have never got a reply.

Where i can find the "color matrix" of the in-camera dng processor?

Given this (is it enought?), i think i can add something like "my 720" to dng4ps2 list of cameras and be happy with the results (btw, is it "wb dependent" or not?)

Thank you.

Re: Powershot A720 raw colors
« Reply #12 on: 11 / May / 2012, 14:07:57 »
http://trac.assembla.com/chdk/browser/trunk/platform/a720/platform_camera.h
Search for CAM_COLORMATRIX1.
Matrix is stored as series of numerators and denominators, so for example 640019, 1000000 means 0.640019 and so on.
Color matrix is constant, WB applied afterwards.

Re: Powershot A720 raw colors
« Reply #13 on: 12 / May / 2012, 15:16:31 »
Thank you cppasm, now it's ok!

The color matrix i've used is here:

0,640019 -0,220031 -0,096241 -0,077419 0,639766 0,044009 0,017965 0,078396 0,231868

And i've added "my 720" to the list of cameras in dng4ps2.

The one stored in the program is here:
14573,000000 -5482,000000 -1546,000000 -1266,000000 9799,000000 1468,000000 -1040,000000 1912,000000 3810,000000


 

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