Filtering Image using Masking

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Filtering Image using Masking
Filtered Image (Blured)
Bluring and Swirling Spring Time
Problem with bluring using compute shader
Problem with bluring using compute shader
Hello.
I have implemented Gaussian Blur using compute shaders and it works good but as I increase the alpha the outcome becomes darker and darker. And I don’t know understand why because the weights sum is equal to one.
This is how I calculate weights :
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