2017

Table Of Contents
Creating High-Contrast Mattes
Use the Auto command to create a high-contrast matte. The minimum and maximum luminance values
for the matte are set using the two colour pots in the AutoMatte menu. Any pixel with a luminance value
below the minimum is set to black, and any pixel with a luminance value above the maximum is set to
white.
Unwanted grey areas can be removed from the matte by increasing the percentage in the Auto Gain field
in the Setup menu.
(a) Auto Gain field
Pixel values between the minimum and maximum values are multiplied by the Gain value. The resulting
values are clipped at the specified maximum luminance value. The Gain is expressed as a percentage value.
The default value of 100% has no effect on the image since the luminance values are multiplied by 1.
To use the AutoMatte command:
1 In the Paint menu, click Matte.
The AutoMatte menu appears.
(a) Minimum luminance (b) Maximum luminance
2 Set the minimum luminance value for the matte in the colour pot on the left. To set the value, click
the field and use the colour picker to select the lightest colour from the image.
3 Set the maximum luminance value for the matte in the colour pot on the right.
Paint Tool | 915