• AJA Video Systems

  P-22 vs SMPTE-C phosphors for color correction?

  Posted by Jim Blokland on May 25, 2005 at 1:15 am

  Any difference between the two?

  Best, JIM.

  Jason Howard replied 21 years, 1 month ago 2 Members · 1 Reply
• 1 Reply

• 

  Jason Howard

  May 25, 2005 at 7:05 am

  Hi Jim,

  The quick answer is: Yes – there is a difference. My suggestion is you go with SMPTE-C as it is much closer to Rec.601 colorimetry specs being used by pretty much all colorspace calculations (with the exception of HD, that is).

  The difference between the two has to do with the peak wavelength emission of each of the three primary color phosphors as well as the overall white point. See https://www.videoessentials.com/res_phosphors.php for several comparesons of phosphor gamuts.

  Also, here is a list of the CIE coordinates and whitepoints for common phosphors types:
  https://www.cs.ucf.edu/courses/cap5725/spring2003/Chromaticity.htm

  Hope that helps answer your question.
  Jason

  Jason Howard
  Linux & Media COW Leader

  https://www.spectsoft.com
  https://www.psinux.org

Reply to this Discussion! Login or Sign Up