_BLUE

The _BLUE function returns the palette intensity or the blue component intensity of a 32-bit image color.

Syntax

blueintensity& = _BLUE(rgbaColorIndex&[, imageHandle&])

Description

• rgbaColorIndex& is the RGBA color value or palette index of the color to retrieve the blue 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 funtions.
• An image handle is optional.

Examples

• See the example for POINT.

See also

• _RED, _GREEN
• _RGB, RGB32
• _LOADIMAGE

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