back color value. Black in the background appears unchanged; the
front color appears in place of white in the background.
Lighten
In Lighten mode, the color values of the front color replace
the underlying color values if the front color value is lighter than the
back color value. White in the background appears unchanged; the
front color appears in place of black in the background.
Difference
The Difference mode compares the color values of the
front and back colors and subtracts the darker value from the lighter
value. If the front and back colors are identical, the result is black. If
the front or back color is black, the other color does not change. If the
front or back color is white, the other color is inverted.
Dodge
Dodge mode compares the lightness values in each channel
of the front and back colors, and uses the lighter value from each
channel for the result color. However, black is not replaced by a
lighter color. White in the front replaces all colors except black.
Burn
Burn mode compares the lightness values in each channel of
the front and back colors, and uses the darker value from each chan-
nel for the result color. However, white is not replaced by a darker
color. Black in front replaces all colors except white.
Color modes
Canvas calculates transfer mode effects by applying formulas to
color values. Canvas performs these calculations in RGB or CMYK
color space. In other words, Canvas uses RGB color values or
CMYK color values in its calculations.
For example, the formula for Multiply mode is Color 1 multiplied by
Color 2. Canvas applies the formula separately to each value that
defines a color. In the case of RGB colors, Canvas applies the for-
mula separately to the red, green, and blue values. For CMYK colors,
Canvas calculates the effect on cyan, magenta, yellow, and black val-
ues.
The significance of the color space calculation is that the effect you
see on screen could appear completely different if the effect is printed
in a different color space.
In particular, you must display transfer mode effects in CMYK if the
document will be separated for printing with process (CMYK) col-
ors. Otherwise, the color separations could produce colors that are
completely different from the colors you see on screen.