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36 lines
1.5 KiB
Plaintext
36 lines
1.5 KiB
Plaintext
{{QBDLDATE:07-31-2022}}
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{{QBDLTIME:23:36:26}}
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{{DISPLAYTITLE:_BLUE}}
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The [[_BLUE]] function returns the palette intensity or the blue component intensity of a 32-bit image color.
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{{PageSyntax}}
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: {{Parameter|blueintensity&}} = [[_BLUE]]({{Parameter|rgbaColorIndex&}}[, {{Parameter|imageHandle&}}])
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{{PageDescription}}
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* {{Parameter|rgbaColorIndex&}} is the ''RGBA'' color value or palette index of the color to retrieve the blue component intensity from.
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* The [[LONG]] intensity value returned ranges from 0 (no intensity, not present) to 255 (full intensity).
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* If {{Parameter|imageHandle&}} specifies a 32-bit color image, {{Parameter|rgbaColorIndex&}} is interpreted as a 32-bit ''RGBA'' color value.
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* If {{Parameter|imageHandle&}} specifies an image that uses a palette, {{Parameter|rgbaColorIndex&}} is interpreted as a palette index.
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* If {{Parameter|imageHandle&}} is not specified, it is assumed to be the current write page.
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* If {{Parameter|imageHandle&}} is an invalid handle, an [[ERROR Codes|invalid handle]] error will occur.
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* If {{Parameter|rgbaColorIndex&}} is outside the range of valid indexes for a given image mode, an [[ERROR Codes|illegal function call]] error occurs.
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* Uses index parameters passed by the [[_RGB]], [[_RGBA]], [[_RGB32]] or [[_RGBA32]] funtions.
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* An image handle is optional.
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{{PageExamples}}
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* See the example for [[POINT]].
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{{PageSeeAlso}}
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* [[_RED]], [[_GREEN]]
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* [[_RGB]], [[RGB32]]
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* [[_LOADIMAGE]]
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{{PageNavigation}}
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[[Category:Latest]]
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