You can use the Histogram menu to adjust the range of values used for the red, green, blue, or luminance channels of an image.
The histogram shows the colour distribution of pixels in the front and result image for the selected channel. The horizontal
axis represents the values of pixels, from black at the left to white at the right. The vertical axis represents the number
of pixels with these colour values.
When working with 16-bit floating point images, the values of the histogram are represented on a logarithmic scale. When working
with integer images (8, 10, or12-bit), the values of the histogram are represented on a linear scale.
To access the Histogram menu:
- Click the Histogram tab.
The Histogram menu options are described as follows.
- Input controls
-
Use the minimum and maximum input sliders or fields to set the input levels of your image.
- Output controls
-
Use the minimum and maximum output sliders or fields to set the output levels of your image.
- Channel Selection box
-
Select which channel you want to work with in the histogram: Luminance, Red, Green, or Blue.
- Out Range Option box
-
When using 16-bit floating point images, you can select Clamp to clamp colour and luminance values, or No Clamp to allow pixel
floating point values to be less the 0 or more than 1.
- Frame Selection box
-
Choose how you want to frame the histogram.
Select |
To Frame: |
Min / Max |
Based on the minimum and maximum slider values. |
Full Range |
The complete range of histogram values. |
Plot Colour |
The plot and reference colours. |
Home |
Based on a [0:1] horizontal and vertical range. |
- Source button
-
Enable to show a histogram of the colour values in the front, or source clip. The source colour values are obtained from the
current frame. If you input both front and matte clips, the colour values in the front clip that are defined by the white
part of the matte are displayed.
- Source View Option box
-
Select whether to display all RGB Source histograms or only the histogram you are working on (Mono).
- Destination button
-
Enable to show a histogram of the colour values in the result, or destination clip. The destination colour values are obtained
from the current frame. If you input both front and matte clips, the colour values in the front clip that are defined by the
white part of the matte are displayed.
- Destination View Option box
-
Select whether to display all RGB Destination histograms or only the histogram you are working on (Mono). When viewing the
Source and Destination histograms at the same time in Mono mode, the Destination histograms are lighter; in RGB mode, the
Destination histograms are displayed with a white outline.
- Reset button
-
Click to reset the settings defined by the Histogram. The Basic properties of the Colour Corrector are unaffected.
- Zoom field
-
Select a vertical zoom value for the histogram display. You can also zoom horizontally by pressing
Ctrl+spacebar and dragging left or right in the histogram. To pan horizontally, click
spacebar and drag left or right in the histogram.