Why is my not well aligned CfaPattern

Hello world

I am currently working on a piece of software that needs to read the DNG raw image data. Everything seems to work fine except for one bad thing:

CfaRepeatPatternDim is: 2, 2

The file CfaPattern is: 0, 1, 1, 2 (R, G, G, B)

CfaPlaneColor is: 0, 1, 2 (R, G, B)

CfaLayout is: (rectangular) 1

So I guess the sensor data is as follows:

R G R G R G ...

G B G B G B ...

...

But the resulting image was completely false colors (way too green, unable to rebuild the original colors of mixture of channels)

I figured out that the image looks right when you use a CfaPattern 1, 0, 2, 1

G B G B G B ...

R G R G R G ...

...

What did I miss?

Some othe values that might help:

ImageWidth: 5344

ImageLength: 3516

ActiveArea: 51, 142, 3516, 5344

DefaultCropOrigin: 10/1 5/1

DefaultCropSize: 3456 5184: 1: 1

Model: Canon EOS 600 d

Thanks in advance for any advice!

Yes, the CFAPattern is defined relative to the active area.  Areas of the image to the outside that are hidden.

I think this is mentioned in the section "PhotometricInterpretation' in the DNG specification: the origin of the motif repeated the CFA is the upper-left corner of the rectangle ActiveArea.»

Tags: Digital Negative

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