Returns the red component of a color. The return value is an integer in the range of 0 to 255, inclusive. The input is an index of a color in the document's color table, an expression that resolves to a custom color (like RGB or HSL), or a reference to a cell that contains a color index or color result. The function returns 0 for invalid input.
The return value is a number in the range 0 to 255, inclusive, or a cell reference that resolves to an index. If expression is invalid, this function returns 0 (black).
Returns 51 if the document uses the default Microsoft Visio color palette, where dark gray is the color at index 22.
Returns the value of the red component of the current font color.
RED(RGB(10, 20, 30))