Exposure adjustment layer discrepancies between 32 bit and 8 bit

Forum|Forum|4 years ago
November 5, 2021
1 reply
637 views

Hi,

I noticed I get different result if I use the exposure adjustment in 32 bit or 8 bit. I've compared by converting the 32 bit to 8 bit with exposure and gamma at 0 and 1 respectively. Here's a comparison to illustrate what I mean. I've used the ligthness on the lab scale. I'm curious to know if I'm making a mistake or it's only due to rounding of numbers during conversion from linear to gamma.

Windows

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rob day

Community Expert

Try setting your Info Eyedropper to 32-bit then you’ll get an real number readout for both 32- and 8-bit:

G

GBoucherMontrealAuthor

Participating Frequently

Thanks a lot, I didn't know we could set the eyedroper to linear values. It's great to have lab values with decimals. But my question was more about: why photoshop gives a different results between 32 bit and 8 bit, if you take the same value and your remove one stop with exposure in both environment. The layer adjustment doesn't give the same result. As you switch to 32bit, you see the dark values all getting lighter but not the light values they stay the same.