Matrox Electronic Systems Matrox RT.X2 User Manual download pdf (Page 143)

135

Creating a shine effect

$ End Opacity Sets the opacity of the rays furthest from the light source.

Levels range from completely transparent (0) to opaque (100).

•

Preprocessing These controls allow you to isolate a channel as the input

for the shine. For example, if you wanted to apply the shine to the alpha

channel only, you would select

Alpha Only as your mode.

$ Enable Preprocessing Select this option to enable preprocessing.

$ Mode Lets you select the channel you want to use for your effect. Click

the triangle on the right to expand the list.

• Red Only Uses the red channel.

• Green Only Uses the green channel.

• Blue Only Uses the blue channel.

• Alpha Only Uses the alpha channel.

• Luma Uses the luminance values.

• Oversaturated Luma Uses the oversaturated luminance values only.

$ Threshold Use this to proportionally increase or decrease the region

outside your

Mode range. For example, if you chose Red Only as your

mode, raising the

Threshold will cause only the really bright red areas of

your image to be affected by the shine.

•

Color Remapping These controls allow you to apply a color gradient to

your effect. For example, you may want to simulate the look of a crackling

fire by using a gradient that contains orange, red, and white.

$ Enable Color Remapping Select this option to enable color remapping.

$ Gradient Allows you to select a gradient. Click the button on the right

to see the list of available gradients. You can use the

Gradient Lower

Boundary

and Gradient Upper Boundary controls to specify a range of

colors from the gradient you choose.

$ Use Gradient Built-in Alpha Select this option when using a gradient

that contains an alpha channel.

$ Gradient Lower Boundary Sets the starting color from the gradient you

chose, which will create a gradual progression between this color and the

Gradient Upper Boundary color. Drag the slider to progress through the

various colors in the gradient. For example if you selected a gradient that

progresses from black to white and you want your gradient to start at

medium gray, drag the slider to 50%.

$ Gradient Upper Boundary Sets the end color from the gradient you

chose, which will create a gradual progression between this color and the

Gradient Lower Boundary color. Drag the slider to progress through the

various colors in the gradient. For example, if you selected a gradient that

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Matrox Electronic Systems Matrox RT.X2 User Manual Page 143

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