Luminous Landscape Forum

Equipment & Techniques => Cameras, Lenses and Shooting gear => Topic started by: Ellis Vener on September 18, 2015, 01:18:23 pm

Title: WhiBal target question: values for white, gray and black patches.
Post by: Ellis Vener 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

Title: Re: WhiBal target question: values for white, gray and black patches.
Post by: Ellis Vener 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

Title: Re: WhiBal target question: values for white, gray and black patches. ANSWERED.
Post by: Ellis Vener 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