Graphics Programs Reference
In-Depth Information
17. Bring the Offset property back to 0.
Using CurveTool to match black and white points
Thinking back to the introduction of this section, how are you going to find the darkest
and lightest points in these two images to match them together? One way, which is valid
and happens often, is using your eyes to gauge which are the darkest and brightest pixels.
However,thecomputerissomuchbetteratthesekindsofthings,anddoesn'thavetocon-
tend with light reflections on the screen, etc.
The Node to use for this is the CurveTool node, which you used in
Chapter 3
to find the
edges of the lemming element. You can also use this node to find other color-related stuff
aboutyourimage.Let'sbringaCurveToolnodeintogaugethedarkestandbrightestpoint
intheforegroundandusethatdatatostretchtheforegroundimagetoafulldynamicrange.
1. Select Read1 and branch out by Shift-clicking a CurveTool node in the Image
toolbox.
This time you are going to use the Max Luma Pixel Curve Type. This finds the
brightest and darkest pixels in the image.
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