Converting Canon T2i raw files

[Cleon_Wells]

The converted dark levels of the  Canon T2i files ( 32bit .fit BatchFormatConversion and Debayered files ) is around 10 times higher then the actual dark levels.

[Juan Conejero]

Hi Cleon,

I don't know the Canon program too much, but I understand it doesn't provide true raw data. Correct me if I'm wrong, but I think the Canon program always subtracts the dark pedestal and applies a white balance correction, and I think it also interpolates the data to de-Bayer the image.

To work with DSLR raw images, you must set DSLR_RAW preferences as follows:

- Color Adjustment: all values = 1.
- White balance: both options disabled.
- Either "Create RAW Bayer" or "Create RAW Bayer CFA" enabled.
- "No black point correction" enabled.

With these options, you'll be reading true raw pixel data as it has been stored in the device. Let me know how it works this way.

[Cleon_Wells]

Juan, it seems that the new codec (WIC) that Canon is using for their raw file format  is the problem.
Also, could you create a new heading on the PI forum for IC, I think this would help new users like me figure out how to properly/correctly create calibrated subs?

[dsnay]

Hi Cleon,

I don't know the Canon program too much, but I understand it doesn't provide true raw data. Correct me if I'm wrong, but I think the Canon program always subtracts the dark pedestal and applies a white balance correction, and I think it also interpolates the data to de-Bayer the image.

To work with DSLR raw images, you must set DSLR_RAW preferences as follows:

- Color Adjustment: all values = 1.
- White balance: both options disabled.
- Either "Create RAW Bayer" or "Create RAW Bayer CFA" enabled.
- "No black point correction" enabled.

With these options, you'll be reading true raw pixel data as it has been stored in the device. Let me know how it works this way.

I could be wrong on this but I don't think the Canon software is actually performing a white balance adjustment. It records the white balance setting value so that subsequent software can use it as a starting point, but there has been no white balance change.
It could well be making other adjustments.  I don't know. However, I have a friend that has contacts within Canon. I'll see what I can find out and get back to you.

Dave