Inside Macintosh: QuickTime Components
Use the color table settings request to retrieve or modify the color table that the standard dialog component uses with all compression operations. Unless you specify otherwise, the component extracts the color table from the source image or sequence.
You supply a pointer to a color table handle ( CTabHandle data type). Your application is responsible for disposing of this handle when you are done with it. Set the pointer to nil to clear the current color table; this may be useful if the current color table is inappropriate for the image or sequence you are working with.