Standard Color Temperatures

[bob carnie]

Or Harmon digital fibre paper through wet chems.

Ilfor MGIV FB

[Ken Lee]

"EV9.15 = 80cd/m² near as damn it (at 100 ISO)"

I use a Pentax Digital Spot Meter, which gives readings in EV. Would a value of ~9 be "close enough for government work" ?

Using Color Eyes Display Pro, I have found that my monitor (soft proofing in Photoshop) matches my prints at around 60 cd/m2 - a bit lower than that "standard" of 80.

"Walk into 10 different gallery's and you will see all kinds of lighting setups."

Gotcha. I have decided not to work with a standardized D50 or D65 viewing box, but rather with the mixture of room lighting and daylight I find at home and work. If we can't standardize on color temperature, at least we can get a sense about the typical range of luminance.

Hence my question about measuring with a light meter. I plan to poke around home and work and see what the values actually are.

[percepts]

according to my spotmeter manual:

EV 8 = 36 cd/m² at ISO 100
EV 9 = 72 cd/m² at ISO 100
EV 10 = 140 cd/m² at ISO 100

So yes EV 9 is pretty close to 80 hence the 9.11 I gave in the correction. I doubt your meter goes to that level of accuracy. 9 is close enough.

[percepts]

Here is the conversion chart...

Attachment 30074

[Ken Lee]

Thanks !

I doubt your meter goes to that level of accuracy. 9 is close enough.

It gives something like 9.0, 9.33, 9.67, 10.0 etc.