_GREEN - QB64 Wiki


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The _GREEN function returns the palette index or the green component intensity of a 32-bit image color.


greenintensity& = _GREEN(rgbaColorIndex&[, imageHandle&])


  • rgbaColorIndex& is the RGBA color value or palette index of the color to retrieve the green component intensity from.
  • The LONG intensity value returned ranges from 0 (no intensity, not present) to 255 (full intensity).
  • 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 will occur.
  • 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.
  • An image handle is optional.

See Example:

See also:

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