<alphaOff> (Alpha Offset)

This element specifies a more or less opaque version of its input color. Increases or decreases the input alpha percentage by the specified percentage offset. A 10% alpha offset increases a 50% opacity to 60%. A -10% alpha offset decreases a 50% opacity to 40%. The transformed alpha values are limited to a range of 0 to 100%. A 10% alpha offset increase to a 100% opaque object still results in 100% opacity.

Parent Elements

<hslClr>; <prstClr>; <schemeClr>; <scrgbClr>; <srgbClr>; <sysClr>



<val> (Value)

Specifies the opacity as expressed by a percentage offset increase or decrease relative to the input color. Increases will never increase the opacity beyond 100%, decreases will never decrease the opacity below 0%.


<a:solidFill> <a:srgbClr val="00FF00"> <a:alphaOff val="-10000"/> </a:srgbClr></a:solidFill>

The possible values for this attribute are defined by the ST_FixedPercentage simple type (§

The following XML Schema fragment defines the contents of this element:

<complexType name="CT_FixedPercentage">
	<attribute name="val" type="ST_FixedPercentage" use="required"/>