UINT RealizePalette();
Takes entries in the logical palette currently selected into a device context and maps them to the system palette.
A logical color palette acts as a buffer between color-intensive applications and the system, allowing an application to use as many colors as needed without interfering with its own color display, or with colors displayed by other windows.
When a window has input focus and calls the function, Windows ensures that it will display all the colors it requests, up to the maximum number simultaneously available on the display, and displays colors not found in the window's palette by matching them to available colors.
In addition, Windows matches the colors requested by inactive windows that call the function as closely as possible to the available colors. This significantly reduces undesirable changes in the colors displayed in inactive windows.
Specifies how many entries in the logical palette were mapped to different entries in the system palette. This represents the number of entries that this function remapped to accommodate changes in the system palette since the logical palette was last realized.
CPalette, ::RealizePalette