alpha
The Alpha visual filter can be used to set the opacity of an object, either the whole image, or a gradient region.
STYLE="filter:Alpha(Opacity=opacity, FinishOpacity=finishopacity, Style=style, StartX=startX, StartY=startY, FinishX=finishX, FinishY=finishY)"
Opacity
Opacity level, 0-100, where 0 is transparent, 100 is fully opaque
FinishOpacity
Optional finish opacity level, 0-100, 0 is transparent, 100 is fully opaque
Style
values can be 0 (uniform), 1 (linear), 2 (radial) or 3 (rectangular)
StartX
X coordinate for start of opacity gradient
StartY
Y coordinate for start of opacity gradient
FinishX
X coordinate for finish of opacity gradient
FinishY
Y coordinate for finish of opacity gradient
For example:
Pressing the button below the image causes the following filter to be applied: