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PictureFormat.OriginalHasAlphaChannel property (Publisher)

  • Article

Returns an MsoTriState constant depending on whether the original, linked picture contains an alpha channel. Read-only.

Syntax

expression.OriginalHasAlphaChannel

expression A variable that represents a PictureFormat object.

Return value

MsoTriState

Remarks

This property only applies to linked pictures. Returns "Permission Denied" for shapes representing embedded or pasted pictures.

Use either of the following properties to determine whether a shape represents a linked picture:

  • The Type property of the Shape object
  • The IsLinked property of the PictureFormat object

An alpha channel is a special 8-bit channel used by some image processing software to contain additional data, such as masking information or transparency information.

The OriginalHasAlphaChannel property value can be one of the MsoTriState constants declared in the Microsoft Office type library and shown in the following table.

Constant Description
msoFalse The original, linked picture does not contain an alpha channel.
msoTriStateMixed Indicates a combination of msoTrue and msoFalse for the specified shape range.
msoTrue The original, linked picture contains an alpha channel.

Example

The following example returns whether the first shape on the first page of the active publication contains an alpha channel. If the picture is linked, and the original picture contains an alpha channel, that is also returned. This example assumes that the shape is a picture.

With ActiveDocument.Pages(1).Shapes(1).PictureFormat 
 If .HasAlphaChannel = msoTrue Then 
 Debug.Print .Filename 
 Debug.Print "This picture contains an alpha channel." 
 
 If .IsLinked = msoTrue Then 
 If .OriginalHasAlphaChannel = msoTrue Then 
 Debug.Print "The linked picture " & _ 
 "also contains an alpha channel." 
 End If 
 End If 
 End If 
End With

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