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Author Topic: D800M - Girlfriend  (Read 1085 times)

bobfriedman

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D800M - Girlfriend
« on: December 12, 2018, 07:24:47 PM »

Monochrome Sensor Conversion

D800M,Carl Zeiss Otus 1.4/55
1/60s f/5.6 at 55.0mm iso250
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brianrybolt

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Re: D800M - Girlfriend
« Reply #1 on: December 13, 2018, 06:32:46 AM »

Are you sure this is not a mannequin?

petermfiore

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Re: D800M - Girlfriend
« Reply #2 on: December 13, 2018, 07:02:40 AM »

Are you sure this is not a mannequin?

Quiet....

Peter

bobfriedman

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Re: D800M - Girlfriend
« Reply #3 on: December 13, 2018, 08:55:20 AM »

Are you sure this is not a mannequin?

Maybe that is why she never complains..
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guido

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Re: D800M - Girlfriend
« Reply #4 on: December 14, 2018, 04:57:28 PM »

She sits still for photos. Don't complain!
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BrianVS

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Re: D800M - Girlfriend
« Reply #5 on: December 27, 2018, 04:02:56 PM »

I would be interested in details about the monochrome conversion of the sensor.

Many conversions require stripping the microlens array- which loses collection efficiency. How is this one done, and who does it?
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bobfriedman

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Re: D800M - Girlfriend
« Reply #6 on: December 27, 2018, 08:36:23 PM »

I would be interested in details about the monochrome conversion of the sensor.

Many conversions require stripping the microlens array- which loses collection efficiency. How is this one done, and who does it?

I had maxmax.com do my conversion.  https://www.maxmax.com/maincamerapage/monochrome-cameras

it is important to have a raw converter that doesn't demosaic as well.. see. https://www.fastrawviewer.com/Monochrome2DNG or DarkTable.

« Last Edit: December 27, 2018, 08:49:50 PM by bobfriedman »
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BrianVS

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Re: D800M - Girlfriend
« Reply #7 on: December 28, 2018, 05:32:34 PM »

Thankyou for the information and links.

I'm glad to see someone offers conversion to Linear DNG- But, I've found that many software packages do not support it. It's a very simple format and easy to parse. I have the original M Monochrom, along with an M9- having a dedicated monochrome camera is well worth the effort.
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BrianVS

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Re: D800M - Girlfriend
« Reply #8 on: January 13, 2019, 01:18:53 PM »

I ran into an interesting flaw in one of the columns of my M Monochrom image. At high ISO, with Dark images only- one line showed up darker than it should have. The column was not dead, but was "non-Uniform". The pixel was not dead, but seemed to have an intensity-dependent flaw when passing pixels. Basically, values were offset.

https://cameraderie.org/threads/leica-m-monochrom.37659/page-37#post-343526

I modified my DNG processor to compute a localized DC offset to restore the bad column, and add some threshold tests to determine if the image was affected by the flaw. This is better than mapping out a dead pixel, which is limited to replacing the column with the average of the neighboring pixels.

This would be an easy algorithm for the Monochrome MAXMAX code to add.
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