Pages: [1]   Go Down

Author Topic: WhiBal target question: values for white, gray and black patches.  (Read 1000 times)

Ellis Vener

  • Sr. Member
  • ****
  • Offline Offline
  • Posts: 2151
    • http://www.ellisvener.com
WhiBal target question: values for white, gray and black patches.
« on: September 18, 2015, 01:18:23 pm »

I know the WhiBal target is not designed to be used as an exposure target, but does anyone have a good idea of what the R G B values in ACR set to sRGB , 8 bit) should be for the gr black, gray, and white target area of the target?  I am using the target as a neutral  to show differences in exposure ranges ( by dialing the flash power down  from maximum  energy on the lights and then adjusting ISO and aperture as needed)  for various electronic flashes
Logged

Ellis Vener

  • Sr. Member
  • ****
  • Offline Offline
  • Posts: 2151
    • http://www.ellisvener.com
Re: WhiBal target question: values for white, gray and black patches.
« Reply #1 on: September 18, 2015, 01:22:06 pm »

If you are not familiar with the WhiBal target an image is attached for reference. I the center ring of the target I am getting the following RGB values: 206 /205 /205. i the white patch: 224 / 224 / 223 , and for the black patch: 16/16/16
« Last Edit: September 18, 2015, 01:26:18 pm by Ellis Vener »
Logged

Ellis Vener

  • Sr. Member
  • ****
  • Offline Offline
  • Posts: 2151
    • http://www.ellisvener.com
Re: WhiBal target question: values for white, gray and black patches. ANSWERED.
« Reply #2 on: September 18, 2015, 01:45:01 pm »

Michael Tapes of WhiBal wrote me

"The L* value of the WhiBal gray is 75. So in PS it is 75 in l*a*b* mode and in Lightroom 75%"

In my sample that I posted above it was 82.

Edit:
I reshot my tests and the RGB values in sRGB for the grey part of the target should be 192/192/192
« Last Edit: September 18, 2015, 01:51:12 pm by Ellis Vener »
Logged
Pages: [1]   Go Up