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Plotting Colour Values
Mastering the RGB Viewer
Reshaping the Convex Hull
Translating, Scaling, and
Rotating Key Elements
You
can fine-tune the key by translating, scaling, or rotating the tolerance
ellipsoid, softness ellipsoid, and patches in the RGB viewer. For
example, scale the softness ellipsoid in a particular direction
to increase the softness. You use the same methods for all three
key element types.
To translate or scale
an element in a particular direction, you use its arrow to specify
the direction. When scaling an element along the axis of the arrow,
you have the option of scaling it equally in both directions from
its centre, or scaling it only in the forward direction of the arrow.
You can also scale an element proportionally in all directions (X,
Y and Z directions).
Before performing the
following operations, set up the RGB viewer to best display the
elements you are working with. Zoom in on the element, decide if
you want to show the histogram, and hide elements that are in the way.
See
Changing the Display of Key Elements.
TipDisplay the 3D histogram
as you make modifications to see the areas of colour that you are
working in. Try reducing the size and opacity of histogram cubes
to see more clearly. See
Setting the 3D Histogram Display.
To modify the tolerance
or softness using these techniques, the ellipsoid must be displayed.
The Tol Display or Soft Display must be set to Ellipsoid, Wireframe,
or Cloud. Likewise, when reshaping patches, the patch box must be
displayed. The box is displayed when the Display is set to Cloud, Box,
or Box&Surf.
See
More Keying Techniques to
learn ways to apply these techniques in specific situations.
To translate a key element:
- Select the element. See
Selecting Key Elements in the RGB Viewer.
- Identify the direction in which you want
to translate the element and set the arrow in this direction. You
can do this manually. See
Controlling Elements with the Directional Arrow.
- Alternatively, you can also plot a pixel
on the image or a histogram cube (see
Plotting Single Colour Values).
When you plot a pixel on the image or a histogram cube, the arrow
of the selected key element automatically points towards the plotted
pixel.
- Press 6 and
drag the cursor in the RGB viewer. Drag to the right to translate
the element forward along the arrow axis, or to the left to translate
it backward.
To rotate a key element:
- Select the element. See
Selecting Key Elements in the RGB Viewer.
- Press 7 and
drag the cursor in the key element.
The key element rotates
in any direction around its centre point.
To scale a key element proportionally:
- Select the element. See
Selecting Key Elements in the RGB Viewer.
- Press 8 on
the keyboard and drag in the RGB viewer. Drag to the right to increase
its size, or to the left to make it smaller.
To scale a key element from its centre:
- Select the element. See
Selecting Key Elements in the RGB Viewer.
- Set the arrow in the desired direction.
You can do this manually. See
Controlling Elements with the Directional Arrow.
You can also set the
arrow by plotting a point on either the image or a histogram cube.
When you plot a point on the image or a histogram cube, the arrow
of the selected key element automatically points towards the plotted
pixel. See
More Keying Techniques.
- Press 9 and
drag the cursor in the RGB viewer. Drag to the right to scale it
larger along the axis of the arrow, and to the left to scale it
smaller.
The element is scaled
equally in the forward and backward directions of the arrow.
To scale a key element in one arrow direction:
- Select the element. See
Selecting Key Elements in the RGB Viewer.
- Set the arrow in the desired direction.
You can do this manually. See
Controlling Elements with the Directional Arrow.
- You can also set the arrow by plotting
a point on either the image or a histogram cube. When you plot a
point on the image or a histogram cube, the arrow of the selected
key element automatically points towards the plotted pixel. See
More Keying Techniques.
- Press 0 and
drag the cursor in the RGB viewer. Drag to the right to scale it
larger in the forward direction of the arrow, or to the left to
scale it smaller towards the centre of the element.
The element is scaled
in the forward direction of the arrow only.