_RED - mkilgore/QB64pe GitHub Wiki
The _RED function returns the palette index or the red component intensity of a 32-bit image color.
- redIntensity& = _RED(rgbaColorIndex&[,])
- rgbaColorIndex& is the RGBA color value or palette index of the color to retrieve the red component intensity from.
- The LONG intensity value returned ranges from 0 (no intensity, not present) to 255 (full intensity).
- imageHandle& is optional.
- If imageHandle& specifies a 32-bit color image, rgbaColorIndex& is interpreted as a 32-bit RGBA color value.
- If imageHandle& specifies an image that uses a palette, rgbaColorIndex& is interpreted as a palette index.
- If imageHandle& is not specified, it is assumed to be the current write page.
- If imageHandle& is an invalid handle, an invalid handle error occurs.
- If rgbaColorIndex& is outside the range of valid indexes for a given image mode, an illegal function call error occurs.
- Uses index parameters passed by the _RGB, _RGBA, _RGB32 or _RGBA32 functions.
- See the example in POINT.
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