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Is there video explaining/comparison LHE vs Unsharp mask?

Shaun Bharrat
in PixInsight
I am at the stage where I would like to add some sharpening into my workflow. I have seen YT tutorials with UnsharpMask and others with LHE. I have the Fundamentals series but haven't found anything in there that explains/compares the PI sharpening tools. Are they in there and I just missed them? If not, any other links to good explanations of these? 

Comments

  • BlockHeadBlockHead
    Hi Shaun,

    I wouldn't consider that particular discussion "Fundamental"... probably belongs in Horizons.
    I do not have that discussion...but I guess a comment. 
    I see Unsharpmask as a *boundary* contrast enhancement (sharpening).
    Though it is in the same family... I would not  equate LHE with USM. 
    LHE looks at ensembles of values (Histogram)... USM does not... and is more like a kernal filter. 

    I have not read up on  Contrast Limited Adaptive Histogram Equalization which is what LHE is based on.

    -the Blockhead

  • BlockHeadBlockHead
    See the WIki article:

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