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* [[Black Calibration]] - Dark frames / Dark currents. [[Category:Dark frames]]

...ke sure your Beta is running in experimental 4k raw mode (1080p60 with A+B frames) ...m for a few seconds, where it will alternate between two frames. These two frames will be from the same raw data as image.raw12, so they contain all that's n

- they are optional, but gain/clip frames require a dark frame - black ref columns will also be subtracted if you use a dark frame.

#raw12 of the 3 color targets, with nicely bracketed range from blown out to dark lit by direct sun 5000k ...es/darkframes.sh (one dark frame at each setting). These are just to check dark current levels, not for calibration.

'''Note:''' This experimental raw mode works only in 1080p60 (A+B Frames) and is only tested with the Atomos Shogun currently. ...ke sure your Beta is running in experimental 4k raw mode (1080p60 with A+B frames)

# turn off all lights in the room - do this at night or in a completely dark room Take 64 dark frames at 10ms, gain x1 with the following script executed on your PC (1.2 GB need

# turn off all lights in the room - do this at night or in a completely dark room Take 64 dark frames at 10ms (~1.2GB), gain x1 with the following script executed on the Beta:

* Dark frame subtraction. * dark current compensation.

We will use two types of calibration: '''sensor profiling''' (e.g. dark calibration, response curves, gain corrections, all that's needed to get a These 3 files allow computing a dark frame for every gain/expo/temperature combination (at least in theory), and

...between different frames, so we can't remove it using a calibration frame (dark frame or whatever). ...rum of the black columns, compared to the spectrum of the row noise from a dark frame, revealed a strong fixed-frequency component present only in the blac

--dchp : Measure hot pixels to scale dark current frame<br /> --no-darkframe : Disable dark frame (if darkframe-xN.pgm is present)<br />

That's right - when exposure time increases, very dark pixels become even darker! Also note the black level, after correcting the image with dark frames and black reference columns, is set to 128 (the entire image is adjusted by

...art, exposed at 30 ms (normal exposure) and 100 ms (overexposed). A little dark in the lab today, but shouldn't be a big problem. ...st of the noise in these curves seems static (correctable with calibration frames)