User Manual

Copy
Copy the value from one color channel to another. For example, copy the foreground red
channel into the background’s Alpha channel to create a matte.
 Add: Add the color values from one color channel to another channel.
 Subtract: Subtract the color values of one color channel from another color channel.
 And: Perform a logical AND on the color values from color channel to color channel.
The foreground image generally removes bits from the color channel of the
background image.
 Or: Perform a logical OR on the color values from color channel to color channel. The
foreground image generally adds bits from the color channel of the background image.
 Exclusive Or: Perform a logical XOR on the color values from color channel to color
channel. The foreground image generally flips bits from the color channel of the
background image.
 Multiply: Multiply the values of a color channel. This gives the appearance of darkening
the image as the values scale from 0 to 1. White has a value of 1, so the result would be
the same. Gray has a value of 0.5, so the result would be a darker image or, in other
words, an image half as bright.
 Divide: Divide the values of a color channel. This gives the appearance of lightening
the image as the values scale from 0 to 1.
 Maximum: Compare the two images and take the maximum, or brightest, values from
each image.
 Minimum: Compare the two images and take the minimum, or darkest, values from
each image.
 Negative: Invert the FG input to make a negative version of the image.
 Solid: Solid sets a channel to a full value of 255. This is useful for setting the Alpha to
full value.
 Clear: Clear sets a channel to a value of zero. This is useful for clearing the Alpha.
 Difference: Difference subtracts the greater color values of one color channel from the
lesser values of another color channel.
 Signed Add: Signed Add subtracts areas that are lower than mid-gray and adds areas
that are higher than mid-gray, which is useful for creating effects with embossed gray
images.
To Red, To Green, To Blue, To Alpha
These menus represent the four color channels of the output image. Use the drop-down menu
to select which channel from the source images produces the output channel.
The default setting copies the channels from the foreground channel. Select any one of the four
color channels, as well as several auxiliary channels like Z-buffer, saturation,
luminance, and hue.
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