Matrox RT.X100 Xtreme User's Guide download pdf (Page 49)

Creating a color pass effect

You can use the following controls to further refine your color pass effect:

•

Color Pass Controls

¥Tip To see the color selector, you’ll need to change the View to Plot or

Map. For more information on the different views, see “Viewing and

selecting colors” on page 43.

$ Hue Use this to rotate the color selector around the perimeter of the color

spectrum so that you can select a different hue (color) to retain.

$ Saturation Use this to select a color that has a particular saturation value.

Pale colors have a low saturation value and are located at or near the center

of the spectrum. Vivid colors have a high saturation value and are located

at or near the perimeter of the spectrum.

$ Luminance Use this to select a color that has a particular luminance

value. A luminance selector in the

Luma Plot (Plot view) or Luma Map

(Map view) indicates the particular luminance value you’ve selected.

$ Aperture Use this to widen or narrow the aperture of the color selector

to increase or decrease the range of colors to be retained.

$ Saturation Threshold Use this to proportionally increase or decrease

the region outside of your saturation range. This controls how closely the

Saturation value specified must match the retained color before a region

is converted to grayscale.

For example, after choosing the color you want to retain, you may find that

some areas of the image that have a similar color have also been retained.

By adjusting the

Saturation Threshold, you can eliminate the color of

these areas, so that they’ll become grayscale.

$ Clear color selection Click this to return your clip to the original colors.

This can be helpful if you want to choose a different color to retain.

¥Tip You can apply keyframes to gradually change the retained color over time

in your image. In this case, you can use the

Toggle Track State button to disable

the tracks, so you’ll be able to see your original clip to help you select a new

color to retain.

Viewing and selecting colors

There are three ways of viewing and selecting the color that you want to retain.

To switch between the views, you can click the appropriate button, or you can use

the following keyboard shortcuts:

Q for Output, W for Plot, and E for Map.

•

Output This is the default view when you first display the Custom Color

Pass

page. You can see the result of your color pass effect in the Preview

Window

•

Plot Click this to plot the colors and luminance values that are present in

the current frame of your clip. The

Luma Plot shows each luminance value

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Matrox RT.X100 Xtreme User's Guide Page 49

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