Dark Current Enable Tool

All things embedded.
*NO FEATURE REQUESTS*

Re: Dark Current Enable Tool

Postby astronomer » Mon Sep 15, 2014 7:22 pm

User avatar
astronomer
Developer
 
Posts: 722
Joined: Fri Apr 06, 2012 10:06 am
Location: US
Been thanked: 293 times

Re: Dark Current Enable Tool

Postby Iliah Borg » Sun Sep 21, 2014 4:43 am

I was under impression D810 does not subtract the black level, as the black is around 600, also listed in Makernotes tag 0x3d.
Best regards,
Iliah Borg
http://www.libraw.org
Iliah Borg
 
Posts: 8
Joined: Sun Sep 21, 2014 4:38 am
Been thanked: 2 times

Re: Dark Current Enable Tool

Postby astronomer » Sun Sep 21, 2014 7:27 am

User avatar
astronomer
Developer
 
Posts: 722
Joined: Fri Apr 06, 2012 10:06 am
Location: US
Been thanked: 293 times

Re: Dark Current Enable Tool

Postby Iliah Borg » Mon Sep 22, 2014 8:10 am

The black frame http://s3.amazonaws.com/IliahBorg/Nikon ... C_1261.NEF
Also, you can check the black level with RawDigger or exiftool (we reported the tag to Phil, and it is processed by exiftool since we discovered it in D5300/D3300). The tag value is to be divided by 4 if the file is in 12-bit mode (not applicable to Nikon's sRAW).
Best regards,
Iliah Borg
http://www.libraw.org
Iliah Borg
 
Posts: 8
Joined: Sun Sep 21, 2014 4:38 am
Been thanked: 2 times

Re: Dark Current Enable Tool

Postby astronomer » Mon Sep 22, 2014 2:00 pm

User avatar
astronomer
Developer
 
Posts: 722
Joined: Fri Apr 06, 2012 10:06 am
Location: US
Been thanked: 293 times

Re: Dark Current Enable Tool

Postby Iliah Borg » Mon Sep 22, 2014 2:17 pm

> I would like to see a dark frame with long exposure, say 5 minutes

I will try to arrange for one.

Gaps in colour channels
Image
- Looks to me like Nikon's white balance pre-conditioning, same as on a regular shot
Image

What you have achieved is a major breakthrough.
Best regards,
Iliah Borg
http://www.libraw.org
Iliah Borg
 
Posts: 8
Joined: Sun Sep 21, 2014 4:38 am
Been thanked: 2 times

Re: Dark Current Enable Tool

Postby astronomer » Mon Sep 22, 2014 2:55 pm

User avatar
astronomer
Developer
 
Posts: 722
Joined: Fri Apr 06, 2012 10:06 am
Location: US
Been thanked: 293 times

Re: Dark Current Enable Tool

Postby Iliah Borg » Mon Sep 22, 2014 3:29 pm

> Also visible is the digital scaling related to aperture value, which is really annoying.

I tend to use lenses that have manual aperture control, like enlarger lenses (they have wider spectral transmittance anyway)

> It appears D4s has black level as well.

True, and any expeed 4 -based camera would be a good candidate to check black level.
Best regards,
Iliah Borg
http://www.libraw.org
Iliah Borg
 
Posts: 8
Joined: Sun Sep 21, 2014 4:38 am
Been thanked: 2 times

Re: Dark Current Enable Tool

Postby Simeon » Mon Sep 22, 2014 9:02 pm

Simeon
Core Developer
 
Posts: 2626
Joined: Wed Nov 30, 2011 6:12 am
Location: Christchurch, New Zealand
Been thanked: 620 times

Re: Dark Current Enable Tool

Postby Iliah Borg » Tue Sep 23, 2014 5:05 am

Best regards,
Iliah Borg
http://www.libraw.org
Iliah Borg
 
Posts: 8
Joined: Sun Sep 21, 2014 4:38 am
Been thanked: 2 times

PreviousNext

Return to Firmware

Who is online

Users browsing this forum: Google [Bot] and 12 guests