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Re: Support for Canon 5D Mark IV??

PostPosted: Sun Oct 23, 2016 9:22 pm
by Christian Gruner
AT75 wrote:Hi,

what about this
http://www.rawdigger.com/howtouse/canon ... -are-there
will C1 support this ability to get additional stop from highligts in dual-pixel raws?


I have forwarded the link to the right persons, but a quick look using the same raw file, and it seems that CO already can recover just as much of the sky as in their best-case example.

Re: Support for Canon 5D Mark IV??

PostPosted: Mon Oct 24, 2016 1:18 am
by HansB
AT75 wrote:Hi,

what about this
http://www.rawdigger.com/howtouse/canon ... -are-there
will C1 support this ability to get additional stop from highligts in dual-pixel raws?


Interesting. They state:
rawdigger.com wrote:...
suppose, neighboring A and B sub-pixels have a value of 8,000; ...
...
there is about a 2x (a stop) difference between the value 8192 in the A / B pixel sets
...

But with the same light on both of the dual pixels of a set and a factor 2 difference between the pixels in a set, it should be
'... neighboring A and B sub-pixels have a value of 4,000 and 8,000; ...'.

A pretty good way to confuse people.

rawdigger.com wrote:...
A Canon 5D Mark IV sensor contains two sets of pixels, A and B. Charge stored in pixels of each set is converted into a 14-bit value.
...
there is about a 2x (a stop) difference between the value 8192 in the A / B pixel sets
...
the main subframe containing sums of the values from the "A" and "B" pixel sets
...

The simple sum doesn't make sense to me.
8192 + 16384 = 24576. Simply adding them, one is clipping at 10922 and the other at 5461, for a 14 bit into 14 bit result.
And, even worse, with the bright pixel capturing a 50% brightness correctly as 8192, the sum would make it 8192 + 4096 = 12288, a 75% brightness.

I expect that combined(A,B) = ( 2*A + B ) / 2, or similar. Possibly way more sophisticated.


In the end I understood that the subframes can be used to create a 2-image HDR stack for highlight recovery.

But maybe I just didn't understand the article at all.


Regards,
Hans

Re: Support for Canon 5D Mark IV??

PostPosted: Sun Apr 08, 2018 10:38 am
by AT75
Will C1 finally support the benefits of dual-pixel raw? Already some individuals made this, why no support from C1?

https://www.dpreview.com/news/086869866 ... -raw-files