I'm using Powerpoint 365 and C# Interop in VS2022 to add a picture to a Powerpoint presentation using:
var pic = slide.Shapes.AddPicture(FileName: pictureName, LinkToFile: MsoTriState.msoFalse, SaveWithDocument: MsoTriState.msoCTrue, Left: picLeft, Top: picTop, Width: picWidth, Height: picHeight);
Once the picture is added, I can go into Powerpoint and right-click the image, select Picture Format then Picture Transparency to set image transparency. I've searched, but cannot find how to set that transparency directly in C#. Tried
pic.Fill.Transparency = 0.5f;
but that didn't work. How could I do this in the interop. Thanks.
