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66 ADVANCED IMAGE PROCESSING
A short guide to histogram corrections
This guide shows simple corrections that can be made with a histogram. Unlike the
tone curve, the histogram provides information on a specific image. This can used to
evaluate the image and make adjustments accordingly.
The histogram of the cherry blossoms shows a gap at the right and the flowers look a
little grey. This is caused by slight underexposure when the image was captured.
By moving the highlight slider to the left to set the white point to where the pixel
distribution ends, the whites become more brilliant and the contrast increases.
On February 20th, 1962, John Glenn became the first American to orbit the Earth.
On board his Friendship 7 spacecraft was a Minolta Hi-matic camera to record that
historic event. The 4 hour, 55 minute, and 23 second flight orbited the Earth three
times at an average speed of 28,000 kph (17,500 mph).
Mr. Glenn visited our Sakai camera factory in Japan on
May 24th, 1963 to plant a palm tree to celebrate the occa-
sion. The palm tree is still in the courtyard of the factory
and stands over eight meters tall (26ft).
The camera? It was not lost. It is on display at
the Smithsonian Institution’s National Air and
Space Museum in Washington D.C. This and
other objects from John Glenn’s Friendship 7
Mercury flight can be found in galley 210,
“Apollo to the Moon.”
Konica Minolta History