"NickHK" schrieb im Newsbeitrag
As a different tack, if you can place the pictures directly on a
worksheet,
you can set:
With ActiveSheet.Shapes("Picture 1").ShapeRange.PictureFormat
.TransparentBackground = msoTrue
.TransparencyColor = RGB(12, 124, 184)
End With

And then stack them on top of each other.

NickHK,

is there a possibility to make this work without putting the pictures on a
worksheet, but rather display them on a userform?

Thanks!
Jens