Luminous Landscape Forum

Raw & Post Processing, Printing => Digital Black & White => Topic started by: bobfriedman on December 12, 2018, 07:24:47 pm

Title: D800M - Girlfriend
Post by: bobfriedman 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
(http://www.pbase.com/bobfriedman/image/167914729/original.jpg)
Title: Re: D800M - Girlfriend
Post by: brianrybolt on December 13, 2018, 06:32:46 am: Are you sure this is not a mannequin?
Title: Re: D800M - Girlfriend
Post by: petermfiore on December 13, 2018, 07:02:40 am: Quote from: brianrybolt on December 13, 2018, 06:32:46 am
Are you sure this is not a mannequin?

Quiet....

Peter
Title: Re: D800M - Girlfriend
Post by: bobfriedman on December 13, 2018, 08:55:20 am: Quote from: brianrybolt on December 13, 2018, 06:32:46 am
Are you sure this is not a mannequin?

Maybe that is why she never complains..
Title: Re: D800M - Girlfriend
Post by: guido on December 14, 2018, 04:57:28 pm: She sits still for photos. Don't complain!
Title: Re: D800M - Girlfriend
Post by: BrianVS 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?
Title: Re: D800M - Girlfriend
Post by: bobfriedman on December 27, 2018, 08:36:23 pm: Quote from: BrianVS 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?

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.
Title: Re: D800M - Girlfriend
Post by: BrianVS 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.
Title: Re: D800M - Girlfriend
Post by: BrianVS 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.
Title: Re: D800M - Girlfriend
Post by: t6b9p on January 23, 2019, 10:47:30 pm: So Bob, you finally gave in and got a Stepford wife.
Title: Re: D800M - Girlfriend
Post by: bobfriedman on January 24, 2019, 05:29:09 am: there is something compelling about her.