Graphics Programs Reference
In-Depth Information
3.
Three properties can be modified:
•
exposure. Modifies the highlight end of the tonal range
with little effect on the extreme shadows.
•
offset. Darkens the shadows and midtones with little effect
on highlights.
•
Gamma. Adjusts the gamma of the photo.
4.
Additionally, three eyedroppers adjust the image's luminance
values:
•
Set Black point eyedropper. Sets the Offset, which shifts
the selected pixel to zero.
•
Set White point eyedropper. Sets the Exposure, which
shifts the selected pixel to white (1.0 for HDR images).
•
Midtone eyedropper. Sets the Exposure, which shifts the
selected pixel to the middle gray.
5.
Make a dramatic adjust-
ment and click OK. Let the
image blow out, because
this will show you the flex-
ibility of HDR images.
6.
Apply a second Exposure
adjustment and bring the
image back into a more
accurate exposure. Notice
that the blown-out areas
are restored (this is often
impossible with 8- or 16-bit
images captured in a single
exposure because over-
exposed or underexposed
data is discarded).
video 71:
Merge to High Dynamic
Range Pro
