The Exposure dialog box is designed for making
tonal adjustments to HDR images, but it works with 8‑bit and 16‑bit
images. Exposure works by performing calculations in a linear color
space (gamma 1.0) rather than the image’s current color space.
Choose Image > Adjustments >
Exposure.
Set any of the following options:
Exposure
Adjusts the highlight end of the tonal scale with minimal
effect in the extreme shadows.
Offset
Darkens the shadows and midtones with minimal affect
on the highlights.
Gamma
Adjusts the image gamma, using a simple power function.
Negative values are mirrored around zero (that is, they remain negative
but still get adjusted as if they were positive).
The eyedroppers adjust the image’s luminance values (unlike
the Levels eyedroppers that affect all color channels).
The Set Black Point eyedropper sets the Offset, shifting
the pixel you click to zero.
The Set White Point eyedropper sets the Exposure, shifting
the point you click to white (1.0 for HDR images).
The Midtone eyedropper sets the Exposure, making the value
you click middle gray.
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