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In-camera processing of long-exposure RAW data

Started Jan 21, 2010 | Discussions thread
OP Marianne Oelund Veteran Member • Posts: 7,779
HPS threshold-speed change?

Bernard Delley wrote:

My D7000 came in last week, and I was curious amongst other things about
hot pixels. Short summary: has NO hot pixels in raw images!

I skimmed the brightest pixels, recording coordinates and values:
Short summary, for exposures of 1/4 sec or longer pairs of "bright" pixels
are found with equal value. This is indicative of a HPS capping (decapitation)
algorithm at work.

That was a lot of data collection effort, Bernard! You could possibly have spared yourself the work, if you had seen my Nov. 30th post which follows.

The new D7000 HPS algorithm isn't quite the Moon Maid algorithm, though. In the presentation material for Nikon that I gave to Thom, I tried to emphasize the importance of including a headroom factor, but apparently Nikon didn't think it was necessary - or perhaps it wasn't straightforward enough to implement.

Are you sure about HPS activating at 1/4-sec. shutter speed? My D7000 (at original firmware version) doesn't use HPS until exposure time reaches 1 sec., which is the same threshold as the D3x.

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