PATONA Premium Serie Handbuch Seite 40

LCD 3G-SDI MONITOR 7"
- Histogram -
The histogram shows the distribution of the luminance or the black and white information along a
horizontal scale. It lets the user monitor how close the details are to being clipped in the blacks or
whites of the video. The histogram also lets you see the effects of gamma changes in the video.
The left edge of the histogram displays shadows, or blacks, and the far right displays the bright
ones, or whites. If you monitor the image of a camera, and you close or open the lens aperture, the
information in the histogram moves to the left or right accordingly. The user can use this to check
"clipping" in the image shadows and bright, and to get a quick overview of the number of details
visible in the tonal ranges. For example, a tall and broad range of information around the middle
section of the histogram corresponds to good exposure for details in the mid tones of your image.
The video is likely being clipped if the information bunches to a hard edge at 0% or over 100% along
the horizontal scale. Video clipping is undesirable when shooting, as detail in the blacks and whites
must be preserved if the user subsequently wants to perform color correction in a controlled
environment. When shooting, try to maintain the exposure so information falls off gradually at the
edges of the histogram with most forming around the middle. This will give the user more freedom
for later to adjust colors without whites and blacks appearing flat and lacking in detail.
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