May 25, 2018, 06:57:36 PM

Author Topic: DR and RAW bit depth on Canon's forthcoming...  (Read 34035 times)

jrista

  • Canon EF 400mm f/2.8L IS II
  • *********
  • Posts: 5319
  • EOL
    • Nature Photography
Re: DR and RAW bit depth on Canon's forthcoming...
« Reply #75 on: March 01, 2012, 01:19:52 AM »
Thank you for the excellent explanation!
+1

Glad to be of service. (And I'm glad that was useful to someone...usually when I post something like that its the end of the thread.  ;)

canon rumors FORUM

Re: DR and RAW bit depth on Canon's forthcoming...
« Reply #75 on: March 01, 2012, 01:19:52 AM »

Flake

  • Guest
Re: DR and RAW bit depth on Canon's forthcoming...
« Reply #76 on: March 01, 2012, 03:28:30 AM »
"You need every scrap of DR you can get your hands on."

Well if you really do need every scrap here's something to consider.

The full exposure of a DSLR camera is acheived when just one of the three RGB channels reaches the 255 value (or close to it), so it makes sense to attept to try to balance the three colours which will give a higher DR.  In situations where the white balance is not optimum, a return to using the old correction filters will help, tungsten having more red channel and fluoresecent having more blue.  Removing these colour casts means that the light reaching the sensor is more 'balanced' there is no colour peak in one of the channels & therefore more headroom.

jrista

  • Canon EF 400mm f/2.8L IS II
  • *********
  • Posts: 5319
  • EOL
    • Nature Photography
Re: DR and RAW bit depth on Canon's forthcoming...
« Reply #77 on: March 01, 2012, 07:32:33 PM »
"You need every scrap of DR you can get your hands on."

Well if you really do need every scrap here's something to consider.

The full exposure of a DSLR camera is acheived when just one of the three RGB channels reaches the 255 value (or close to it), so it makes sense to attept to try to balance the three colours which will give a higher DR.  In situations where the white balance is not optimum, a return to using the old correction filters will help, tungsten having more red channel and fluoresecent having more blue.  Removing these colour casts means that the light reaching the sensor is more 'balanced' there is no colour peak in one of the channels & therefore more headroom.

I guess thats an option. Some concerns with that would be the effect of an additional filter element in front of the lens...greater chance for flaring, reduction in contrast or sharpness due to the quality of the filter (which can be very high, but very rarely as high as the glass in the lens itself), etc. With 35mm film, resolution was generally not as high as it is today (with a few exceptions), so the impact of a filter on resolution, vs. the ability to correct white, was not a big deal. With incredibly high resolution sensors today, the quality of all the optics in front of them matters more and more.

canon rumors FORUM

Re: DR and RAW bit depth on Canon's forthcoming...
« Reply #77 on: March 01, 2012, 07:32:33 PM »