Wow! I got unexpected result:- set custom WB on color target and shoot DNG- read WB in camera settings from properycase #100 (first 4 values) for example: 647 1561 2268 647 (and write it to paper )- use this values in dcraw: dcraw -v -W -o 0 -q 3 -4 -T -r 1561 647 2268 647 DNG_9012.DNG ... and colors in resulting tiff image are very similar to jpeg.Tested at 3 images with different manual WB (on red, green, blue targets).My question to gurus in color management: how to store these values in DNG (it is possible it to convert to AsShotNeutral values)?
From my remembering, as I used to make my own experimental raw converter 2 years ago, these four values are simply multipliers for R, G, B , G pixel linear value (divided by 1000). dcraw multiplies every linear pixel value value with appropriate multiplier to get WB corrected values and that's it. After debayerization, RGB value of every pixel is transformet from sensor color space to output color space with matrix operation, using color matrix. There are 2 green multipliers - usually their values are the same, but some sensors have 2 types of greeen pixels (slightly different green filter) and in that case values are different. From my remembering, these 4 values are stored in this form in raw file of every camera and dcraw simply extracts them and uses for white balanceUnfortunately, I don't know how to convert these values to appropriate DNG tag (AsShot Neutral or AsShotXY)
Unfortunately, I don't know how to convert these values to appropriate DNG tag (AsShot Neutral or AsShotXY)
Can you add "dng via usb" feature for ixus860/sd870 ?
In #644 this feature added to a610, a630, a640, s5is (dps, thm->dng) and ixus860 (cr2->dng).
sent to you in pm.
Quote from: vit40 on 19 / December / 2008, 02:38:58Unfortunately, I don't know how to convert these values to appropriate DNG tag (AsShot Neutral or AsShotXY)In my experiments if AsShotNeutral tag is (a,b,c) then dcraw reports "using multipliers : 1/a 1/b 1/c 1/b".If green channels multipliers are equal (it seems correct for a710) WB settins maybe can be embedded in DNG (I can make test version to verify this).
Quote from: oversky on 15 / December / 2008, 22:00:03Is there any tool available that can convert an uncompressed DNG to a compressed DNG?I am 99% sure that "Adobe DNG Converter" does this....
Is there any tool available that can convert an uncompressed DNG to a compressed DNG?
Started by eliavecellio « 1 2 » Feature Requests
Started by eliavecellio « 1 2 » RAW Shooting and Processing
Started by kdeal Feature Requests
Started by mikerussell RAW Shooting and Processing
Started by GrAnd General Help and Assistance on using CHDK stable releases
