Nikon D90 Manual page 71

Viewing/Reviewing Images 71
Shadows Dark tones Mid-tones Light tones Highlights.
Here's the photo for this histogram. Once again the light and dark
tones in the photo match what is seen in the histogram.
PLAYBACK SUMMARY
The basic info screen is good for viewing your photos and showing
them to others. The highlight and overview screens are useful for
evaluating your exposure. These are the two screens I check after tak-
ing a photo to make sure the exposure is correct. The RGB Histogram
screen provides more in-depth histogram information. The three
detail screens give you the technical information for your image. This
may be more information than you ever want to know about your
photos, but it's there if you need it! This information is actually part
of the image file that is saved on your memory card. Using the soft-
ware we'll look at in Part II you can see this information again after
you put the pictures on your computer. This is convenient, because at
a later date you may want to look up a certain setting such as what
aperture you used or what the ISO was set at. You can even find out
on what date you took a photo. No need to remember when you vis-
ited a certain place, you can just use the software to look up the date
for a photo you took there.