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Sharpening your images...

Comments

  • #2
    whitetea
    Closed Accounts Posts: 48 ✭whitetea


    I thought that when you delevelop a RAW file in Lightroom or Camera RAW or other popular application, they do a default amount of sharpening for you.. Isn't that right?


  • #3
    Marcus
    Registered Users Posts: 1,031 ✭✭✭Marcus


    We did a lot of investigation and testing on image sharpening following a discussion last year with Sineadw and Valentia about Pixie images not being as sharp as Flickr.

    We concluded that when images are resized (reductions), they loose their sharpness due to the fact that a smaller number of pixels are now responsible for providing the same information as the larger image. Pixels fold onto each other and hence become blurred. I guess this is why they talk about heavier sharpening for "web images". What they really mean is images that have received a large reduction in size from the original as web images are typically around 500px wide.

    We now use an algorithm similar to "unsharp mask" on all resized images and have different presets based on the amount of reduction taking place. Going from a large full size image to a 500px has totally different parameters than going from a 800px to a 240px. We ended creating a formula that provided radius, amount and threshold parameters for a resizing of (w1 x h1) to (w2 x h2) and this seems to work perfectly 99% of the time.


  • #4
    sasar
    Registered Users, Registered Users 2 Posts: 617 ✭✭✭sasar


    I usually use a combination of unsharp mask and high pass filter + soft light for my images.


  • #5
    GhostInTheRuins
    Registered Users, Registered Users 2 Posts: 5,966 ✭✭✭GhostInTheRuins


    Morrisseeee wrote: »
    Link to a good article on the 'Unsharp Mask' in Photoshop.

    linky: http://photojojo.com/content/tutorials/photoshop-sharpening/

    I suppose, for web pics I should have been sharpening alot more !, especially landscape.

    It's a different way of sharpening than I'd be used to, I rarely go over 150% nevermind up to 400%, but I don't think I've ever used the threshold slider either. I must give it a go.


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