Photoshop CC. Lasso Problem

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  • Updated 2 years ago
When using the lasso tool with a feathered edge e.g. 20 pixels and painting to it's edge, when you hide the Lasso and continue painting around the edge it grows bigger.
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Jim O'Farrell

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Posted 2 years ago

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christoph pfaffenbichler, Champion

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You might be confusing the behaviour of Layer Masks and Selections: 
• The Layer Mask limits the visibility of a Layer, so a solid pixel will in effect assume a transparency determined by the corresponding Mask pixel. 
• A Selection limits the application of a Brush stroke on a Layer for example but another stroke will – with the same limitations – add on the existing pixel content of the Layer. 

If I misunderstood the problem please post screenshots to clarify. 
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Jim O'Farrell

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Hi Christoph, thanks for your reply but I don't think I explained myself very well.
However I've now found what was causing the problem. I had never realised that if I were to continually repeat a 100% fill in a feathered selection that it would keep reducing the feather i.e. reducing the soft edge. I don't ever remember this happening in previous versions of Ps.
By the way I wouldn't ever be continually filling a feathered selection, it just demonstrates the problem I was having.  
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christoph pfaffenbichler, Champion

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»I don't ever remember this happening in previous versions of Ps.«
It is as it has been and if you did not notice it before you probably did not do it to the same extreme as in this case. 
But saying it "reduces the soft edge" does not do the issue justice in my opinion – it builds up the opacity of the affected pixels and due to quantisation this may lead to banding.