User Guide

Chapter 5184
Subtract
subtracts the RGB color value of the foreground sprite’s color from the RGB value of the
background sprite’s color to determine the new color. If the color value of the new color is less
than 0, Director adds 256 so the remaining value is between 0 and 255.
Subtract Pin subtracts the RGB color value of pixels in the foreground sprite from the value of the
background sprite. The value of the new color is not allowed to be less than 0. If the value of the
new color is negative, the value is set to 0.
Darken changes the effect of the Foreground and Background color properties of a sprite to create
dramatic color effects that generally darken and tint a sprite. Darken ink makes the background
color equivalent to a color filter through which the sprite is viewed on the Stage. White provides
no filtering; black darkens all color to pure black. The foreground color is then added to the
filtered image, which creates an effect that is similar to shining light of that color onto the image.
Selecting Darken ink has no effect on a sprite until you select nondefault foreground and
background colors. See “About Darken and Lighten inks” on page 182.
Lighten changes the effect of the Foreground and Background color properties of a sprite so that
it is easy to create dramatic color effects that generally lighten an image. Lighten ink makes the
colors in a sprite lighter as the background color gets darker. The foreground color tints the image
to the degree allowed by the lightening. See “About Darken and Lighten inks” on page 182.
Note: Mask and Matte use more memory than other inks because Director must duplicate the mask of the artwork.
Assigning a cast member to a sprite with Lingo
Several Lingo properties specify the cast member that is assigned to a sprite. You can use
these properties to determine a sprite’s cast member and switch the sprite’s cast members as
the movie plays.
To specify the cast member, including its cast:
• Set the member sprite property. See member (sprite property) in the Lingo Dictionary.
Setting this property is the most reliable way to specify a sprite’s cast member. You can also set
the
memberNum sprite property, but this is reliable only when the new cast member is in the
same cast as the current cast member.
To determine which cast contains the cast member assigned to a sprite:
• Test th e castLibNum sprite property. See castLibNum in the Lingo Dictionary.
This procedure is useful for updating movies that serve as templates.