Makes all pixels of the chosen color invisible inside the specified window.
WinSetTransColor Color , WinTitle, WinText, ExcludeTitle, ExcludeText
Specify a color name or RGB value (see the color chart for guidance, or use PixelGetColor in its RGB mode). To additionally make the visible part of the window partially transparent, append a space (not a comma) followed by the transparency level (0-255). For example: WinSetTransColor "EEAA99 150".
If the value is a string, any numeric color value must be in hexadecimal format. The color value can be omitted; for example, WinSetTransColor " 150" (with the leading space) is equivalent to WinSetTransparent 150.
"Off" (case-insensitive) or an empty string may be specified to completely turn off transparency for a window. This is functionally identical to WinSetTransparent "Off". Specifying Off is different than specifying 255 because it may improve performance and reduce usage of system resources (but probably only when desktop composition is disabled).
Type: String, Integer or Object
If each of these is blank or omitted, the Last Found Window will be used. Otherwise, specify for WinTitle a window title or other criteria to identify the target window and/or for WinText a substring from a single text element of the target window (as revealed by the included Window Spy utility).
ExcludeTitle and ExcludeText can be used to exclude one or more windows by their title or text. Their specification is similar to WinTitle and WinText, except that ExcludeTitle does not recognize any criteria other than the window title.
Window titles and text are case-sensitive. By default, hidden windows are not detected and hidden text elements are detected, unless changed with DetectHiddenWindows and DetectHiddenText; however, when using pure HWNDs, hidden windows are always detected regardless of DetectHiddenWindows. By default, a window title can contain WinTitle or ExcludeTitle anywhere inside it to be a match, unless changed with SetTitleMatchMode.
A TargetError is thrown if the window could not be found.
An OSError is thrown if the change could not be applied.
This allows the contents of the window behind it to show through. If the user clicks on an invisible pixel, the click will "fall through" to the window behind it.
To change a window's existing TransColor, it may be necessary to turn off transparency before making the change.
The ID of the window under the mouse cursor can be retrieved with MouseGetPos.
This function is often used to create on-screen displays and other visual effects. There is an example of an on-screen display at the bottom of the Gui object page. For a simple demonstration via hotkeys, see WinSetTransparent example #4.
WinSetTransparent, Win functions, Control functions