50% alpha border problems - Fusion

I have multiple clips in a frame over a generator. I wanted each clip to have a 50% opacity edge/border that would reveal the generator below. I thought I set this up right in fusion. It appears ok there; but the view on the timeline is off. Any idea why this is happening? Also, I do know that there is a crop on one edge that will throw it off. But the other edges ought to be in tact. Pics of fusion page and timeline below.

Create a Rectangle with the following properties:
- Width and Height both = 1.0
- Solid = unticked
- Border Width = 0.06 (or similar)

Result (viewing the Rectangle in a Viewer to see its alpha channel):


At the end I'll give you a Rectangle node you can just copy in.

Now, duplicate your MediaIn node, pipe the same Rectangle to both nodes, and Merge one over the other:


Then in the MediaIn that's going to the Merge's background (yellow) input (MediaIn1_1 in my example):
- Inspector -> Settings -> tick Apply Mask Inverted and Multiply By Mask


Finally, in the Merge set Blend to 0.5.

Result - note Alpha value shown in the colour inspector in the top left, this is for one of the edge pixels:


Then on Edit this will behave how you expected.

Rectangle node you can copy into Fusion:

Code: Select all

{
   Tools = ordered() {
      Rectangle1 = RectangleMask {
         CtrlWZoom = false,
         Inputs = {
            Filter = Input { Value = FuID { "Fast Gaussian" }, },
            BorderWidth = Input { Value = 0.06, },
            Solid = Input { Value = 0, },
            MaskWidth = Input { Value = 1920, },
            MaskHeight = Input { Value = 1080, },
            PixelAspect = Input { Value = { 1, 1 }, },
            ClippingMode = Input { Value = FuID { "None" }, },
            Width = Input { Value = 1, },
            Height = Input { Value = 1, },
         },
         ViewInfo = OperatorInfo { Pos = { 914.993, 67.866 } },
      }
   },
   ActiveTool = "Rectangle1"
}

Or to do it with MatteControl:


Rectangle mask is as before, except Level is set to 0.5


MatteControl is:


(Note the "Post Multiply Image" ticked at the bottom)

Nodes to copy (just add your MediaIn and MediaOut):

Code: Select all

{
   Tools = ordered() {
      MatteControl1 = MatteControl {
         Inputs = {
            MatteCombine = Input { Value = 4, },
            CombineOp = Input { Value = 2, },
            Filter = Input { Value = FuID { "Fast Gaussian" }, },
            PostMultiplyImage = Input { Value = 1, },
            Foreground = Input {
               SourceOp = "Rectangle1_1",
               Source = "Mask",
            },
         },
         ViewInfo = OperatorInfo { Pos = { 1248.75, 235.873 } },
      },
      Rectangle1_1 = RectangleMask {
         CtrlWZoom = false,
         Inputs = {
            Level = Input { Value = 0.5, },
            Filter = Input { Value = FuID { "Fast Gaussian" }, },
            BorderWidth = Input { Value = 0.06, },
            Solid = Input { Value = 0, },
            MaskWidth = Input { Value = 1920, },
            MaskHeight = Input { Value = 1080, },
            PixelAspect = Input { Value = { 1, 1 }, },
            ClippingMode = Input { Value = FuID { "None" }, },
            Width = Input { Value = 1, },
            Height = Input { Value = 1, },
         },
         ViewInfo = OperatorInfo { Pos = { 1269.28, 187.738 } },
      }
   }
}

Thank you so much. Will try today.

Thanks again. The first method worked perfectly!

I actually tried with matte control first since that was more similar to my initial idea and seemed slightly simpler. But I couldn't get the matte control approach to work. If you see an error, I'd be pleased to know.

Thanks again. The first method worked perfectly!

I actually tried with matte control first since that was more similar to my initial idea and seemed slightly simpler. But I couldn't get the matte control approach to work. If you see an error, I'd be pleased to know.

mask is going into wrong input of matte control. Should be green not blue input.

Thanks again. I've got some color and edit skills; but fusion is where I get confused.