Flas, Front End Design, Back End Programming, Design, Photoshop, Photography
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Various man made and natural factors contribute to a photo having "haze", these include water vapor, smoke and pollution, etc. Digital cameras can also contribute to the problem by not capturing the full dynamic range.
Amount determines how much to increase the contrast of pixels. We're working with subtle highlights here, so for most cases you won't want to boost this by more than 20-30%.
Radius is used to identify how many pixels around edges to sharpen. For sharpening contrast in the localized fashion were working with here, a number between 40-70 seems to work well depending on the image, because you can really make edges stand out.
Threshold determines how far pixels must be from surrounding area in order to be considered an edge. By leaving the threshold at 0 the entire image is sharpened. Increasing this number to anything greater than 0 seems to make the effect useless for what we're doing here.