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As demostrated by the image below (three rectangles, two of them blurred, and four pixel brush dots with soft edges)  Affinity designer and Affinity photo handle transparency and blending in a mathematically erroneous manner. It is wrong because blended areas are darker than any of the blended colors.

 

post-26340-0-08282400-1463660603_thumb.png

 

Here is a friendly video by MinutePhysics that explains what I think is going on and how to fix it:

https://www.youtube.com/watch?v=LKnqECcg6Gw

post-26340-0-08282400-1463660603_thumb.png

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Hi OrigoRho,

 

That video certainly makes for an interesting watch. I'll pass this over to development for them to look into.

 

Thanks :)

 

*Edit* - I have tested this in some other apps and it does appear we are doing something different. It has now been logged with dev.

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