Color Mixing
Color mixing lets an application create new colors by combining the pen or
brush color with colors in the existing image. The application can choose either
to draw the pen or brush color as is (effectively drawing over any existing
image) or to mix the color with the colors already present.
The foreground mix mode, sometimes called the binary raster operation,
determines how these colors are mixed. An application can merge colors, preserving all
components of both colors; mask colors, removing or moderating components that
are not common; or exclusively mask colors, removing or moderating components
that are common. There are several variations on these basic mixing operations.
Color mixing is subject to color approximation. If the result of color mixing
is a color that the device cannot generate, Windows approximates the result,
using a color it can generate. If an application mixes dithered colors, the
individual colors used to create the dithered color are mixed, and the results are
subject to color approximation.
An application sets the foreground mix mode by using the
SetROP2 function and retrieves the current mode by using the
GetROP2 function.
Although there is a background mix mode, that mode does not control the mixing
of colors. Instead, it specifies whether a background color is used when
drawing styled lines, hatched brushes, and text.
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