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Nero PhotoSnap Nero PhotoSnap • 24
b. The histogram has a "mountain" on the right but the left-hand side is relatively
empty or very flat. This means that the picture is overexposed. The histogram
needs to be moved to the left to correct it.
c. The histogram has a "mountain" in the middle, though the histogram to the left
and right of it is very flat. This means that your digital camera has not made full
use of the CCD chip's available brightness range. Depending on the width of the
"mountain" in the histogram, the picture may appear low in contrast to a greater
or lesser extent. There are two possible causes: either the camera's automatic
control mechanisms have not worked or the subject does not have a large
brightness range (e.g. a foggy day in London or a black cat on a dark cushion). If
the subject was the cause of the problem, an exposure correction would ruin the
atmosphere of the picture and so the image should not be changed. When
correcting the image, the histogram should be stretched in such a way that use is
made use of the entire brightness range available.
d. A mountainous landscape can be seen on the histogram, covering the entire
range of the histogram from left to right. By all appearances, a picture like this is
correctly exposed. Correction is probably not necessary.
However, if you would still like to undertake an exposure correction by shifting the
left and right-hand sides of the histogram, all the data outside the vertical border
lines of the histogram will be lost. On the other hand, if a particular color area is
to be brightened or made darker, this can be done with the aid of the gradation
curves (by "bending" the curve up or down).
1. Start Nero PhotoSnap and open the desired photograph.
2. Click on the 'Exposure' effect to open the editing menu for this effect.