| MsoTriState can be one of these MsoTriState constants. |
| msoCTrue Not used with this property. |
| msoFalse The specified picture does not contain an alpha channel. |
| msoTriStateMixed Indicates a combination of msoTrue and msoFalse for the specified shape range. |
| msoTriStateToggle Not used with this property. |
| msoTrue The specified picture contains an alpha channel. |
expression.HasAlphaChannel()
expression Required. An expression that returns a PictureFormat object.
Remarks
An alpha channel is a special 8-bit channel used by some image processing software to contain additional data, such as masking or transparency information.
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 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