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Thread: How to Sharpen Images

  1. #1
    Senior Member cichlid's Avatar
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    Default How to Sharpen Images

    Hi all

    How do you all sharpen your images in Elements or CS?

    Do you use Unsharp mask or adjust sharpness?

    If using unsharp mask, how to set the Amount % , Radius pixels and threshold?

  2. #2

    Default Re: How to Sharpen Images

    cs 2

    unsharp mask, try to limit your radius pixels.. how much depends on the size, amount should not go beyond 100% as far as i can see

    best is to zoom in 100% so you can see what you are doing to "degrade" the image

    if you are posting websize can go a little more aggressive, when resize cannot see the jagged little edges/haloing hurhur

    here is another way, works for certain pictures very well

    if you wonder what all the parameters mean, i quote:

    Radius controls how wide the edge rims become, and Radius = 1.0 is about the right ballpark, with 0.6 to 2.0 often being useful. Higher Radius values can cause halos at the edges, a detectable faint light rim around objects. Radius units are not the same as pixels, the units step in tenths, but the Radius width is usually at least 4 pixels overall, you will see various effects. Radius is a very important parameter, and the easiest way to ruin a good scan is with too much Radius. Inanimate objects can use the most radius, human faces can tolerate the least, and landscapes fall in between. But it really depends on the size of the details. Fine detail needs a smaller Radius, or else you may obliterate tiny detail of the same size as the Radius width. Large images have larger detail (more pixels involved) and can use more Radius, so therefore printing at higher resolution can support the larger radius. Radius and Amount interact, reducing one allows more of the other.

    Threshold specifies how far apart adjacent tonal values have to be (values of 0..255) before the filter does anything to the edges, before it is judged to be an edge at all. This lack of action is important to prevent smooth areas from becoming speckled. Low values should sharpen more because fewer areas are excluded. Higher threshold values exclude areas of lower contrast. Human faces want values greater than 1 or 2, like perhaps 5 or more. For inanimate objects, perhaps 0 or 1 is useful. General work, try 3 or 4. This control has little effect at high values, but has more effect changing between low values of 0 to 5. This Threshold is not to be confused with Line art Threshold.

    Amount is like a volume control, exaggerating the edge differences (how much darker and how much lighter the edge borders become). Amount interacts with Radius as to degree of sharpening, but it does not affect the width of the edge rims. Amount has a large effect, and values of 80 to 120 are normally usable if the Radius isn't too large.
    Last edited by night86mare; 22nd March 2008 at 10:02 PM.

  3. #3
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    Default Re: How to Sharpen Images

    Use unsharp mask, depending on whether is it for web or print. Range from 85-100%. Radius usually use 1. For threshold depending on the intensity, 1 for major sharpening and 5 for subtle changes
    Canon 5D mkII|24-105 F4 IS L|70-200 F4 IS L|135 F2 L|580EX|

  4. #4
    Senior Member cichlid's Avatar
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    Default Re: How to Sharpen Images

    ok thanks guys

    no wonder my pics look horrible,

    i think the Amount is more than 250% .
    Radius 65.7 pixels and
    Threshold 135 levels


  5. #5

    Default Re: How to Sharpen Images

    Quote Originally Posted by cichlid View Post
    ok thanks guys

    no wonder my pics look horrible,

    i think the Amount is more than 250% .
    Radius 65.7 pixels and
    Threshold 135 levels



    wow, that's scary

  6. #6

    Default Re: How to Sharpen Images

    Mmm... I find the following works well to start with, then adjust to suit the picture:

    For picture size of about 900 x 600px:
    Amount: 50 - 70%
    Radius: 0.5
    Threshold: 3

    For picture size of about 500 x 333px:
    Amount: 30 - 50%
    Radius: 0.5
    Threshold: 3

  7. #7
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    Default Re: How to Sharpen Images

    For me...

    Amount: 30 - 200% (depending on image size and how aggressive I need it to be sharpened)
    Radius: 2
    Threshold: 10

  8. #8

    Default Re: How to Sharpen Images

    will this method reduce handshake blur? thks
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  9. #9
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    Default Re: How to Sharpen Images

    Depends on how much blur you're talking about. Get it right when you shoot. The original intention of sharpening is not for correcting a mistake, but rather overcoming lens/sensor limitations for sharpness.

  10. #10
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    Default Re: How to Sharpen Images

    Quote Originally Posted by sin77 View Post
    will this method reduce handshake blur? thks
    scott kelby has some tips on combating handshakes with USMs...
    Canon 5D mkII|24-105 F4 IS L|70-200 F4 IS L|135 F2 L|580EX|

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