Comparison Of Perfectly Clear™ Versus Other Advanced Enhancement Techniques

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Original Image
Perfectly Clear™	omnistretch Arguments: -m RGB -acc 3	retinex Arguments: -m HSL -f 50
redist Arguments: -m HSL 50,80,80	space Arguments: -m .5 -b 1.5 -c 3 -w 5	coefroot Arguments: .85
Ranking: Retinex -- brought out more detail without exaggerating the clouds Perfectly Clear -- a bit too dark Omnistretch -- sky color a bit light Redist -- less detail in clock tower and clouds exaggerated Space -- good detail, but halo around building Coefroot -- too dark and exaggerated clouds

Original Image
Perfectly Clear™	omnistretch Arguments: -m RGB -acc 3	retinex Arguments: -m HSL -f 0 -c 1.25
redist Arguments: -m HSL 50,80,80	space Arguments: -m .5 -b 1.5 -c 3 -w 5	coefroot Arguments: .85
Ranking: Perfectly Clear -- if you believe the color shift towards gold frame is accurate Space -- good coloration in center figure Redist -- whiter center, but dull coloration in center figure Coefroot -- good coloration in center figure Retinex -- dull coloration in center figure Omnistretch -- over all orange tint

Original Image
Perfectly Clear™	omnistretch Arguments: -m RGB -acc 1	retinex Arguments: -m HSL -f 0
redist Arguments: -m HSL 60,60,60	space Arguments: -m .5 -b 1.4 -c 3 -w 5	coefroot Arguments: .85
Ranking: Perfectly Clear Omnistretch -- slightly more contrast Coefroot -- some artifacting Space -- some haloing Redist -- clouds too dark Retinex -- sky too dark and white artifact on left edge

Original Image
Perfectly Clear™	omnistretch Arguments: -m RGB -acc 3	retinex Arguments: -m HSL -f 0
redist Arguments: -m RGB 50,80,80	space Arguments: -m .5 -b 1.5 -c 3 -w 5	coefroot Arguments: .9
Ranking: Perfectly Clear -- better sharpness, but color balance overshifted to red (see snow) Omnistretch -- still a little blue Redist -- still a little blue Coefroot -- a little too much contrast Retinex -- fails with gray in snow Space -- too much detail enhancement

Original Image
Perfectly Clear™	omnistretch Arguments: -m RGB -acc 3	retinex Arguments: -m HSL -f 0 -c 1.2
redist Arguments: -m HSL 40,80,80	space Arguments: -m .5 -b 1.5 -c 3 -w 5	coefroot Arguments: .85
Ranking: Redist -- nice white clouds Perfectly Clear -- clouds slightly blue Retinex -- clouds too dark Coefroot -- clouds slightly dark Space -- clouds too dark Omnistretch -- over all a little dark

Original Image
Perfectly Clear™	omnistretch Arguments: -m RGB -acc 3	retinex Arguments: -m HSL -f 0
redist Arguments: -m HSL 50,80,80	space Arguments: -m .5 -b 1.5 -c 3 -w 5	coefroot Arguments: .85
Ranking: Perfectly Clear -- clearly the best Retinex -- orange "smog" over mountains Space -- lost some coloration Omnistretch -- over all a little dark Redist -- greens are too pastel and artifacts in sky Coefroot -- too dark

Original Image
Perfectly Clear™	omnistretch Arguments: -m RGB -acc 2	retinex Arguments: -m HSL -f 50
redist Arguments: -m RGB 60,60,60	space Arguments: -m .5 -b 1 -c 3 -w 5	coefroot Arguments: .95
Ranking: Coefroot -- good sky color Perfectly Clear -- slightly oversaturate as sky is too dark Retinex -- some loss of color on left side Redist -- a bit too pastel sky omnistretch -- a bit too pastel sky Space -- loss of coloration and red mountain top

Original Image
Perfectly Clear™	omnistretch Arguments: -m RGB -acc 1	retinex Arguments: -m HSL -f 50
redist Arguments: -m RGB 30,80,80	space Arguments: -m 0 -b 1.5 -c 1 -w 5	coefroot Arguments: .9
Ranking: Retinex -- most even illumination Redist -- (tie for second) trees slightly dark, but good detail in water Space -- (tie for second) trees slightly dark, but good detail in water Perfectly Clear -- trees slightly dark and less detail in water Coefroot -- a little too much contrast Coefroot -- a littl too much contrast

Original Image
Perfectly Clear™	omnistretch Arguments: -m RGB -acc 3	retinex Arguments: -m HSL -f 0
redist Arguments: -m RGB 30,80,80	space Arguments: -m .5 -b 1.5 -c 3 -w 5	coefroot Arguments: .9
Ranking: Retinex -- better tree detail and some blue sky Perfectly Clear -- a little hazy especially the building and shadows omnistretch -- slight loss of color in blue dome Redist -- slight loss of color in blue dome Coefroot -- too much contrast Space -- too much contrast

Original Image
Perfectly Clear™	omnistretch Arguments: -m RGB -acc 3	retinex Arguments: -m HSL -f 0
redist Arguments: -m RGB 50,80,80	space Arguments: -m .5 -b 1.5 -c 3 -w 5	coefroot Arguments: .85
Ranking: Retinex -- most even illumination Perfectly Clear -- a little too dark Omnistretch -- a little too dark Redist -- coloration too pastel Coefroot -- too much contrast Space -- strange purplish border on cement walkway

Original Image
Perfectly Clear™	omnistretch Arguments: -m RGB -acc 1	retinex Arguments: -m HSL -f 0
redist Arguments: -m HSL 60,60,60	space Arguments: -m .5 -b 1.5 -c 3 -w 5	coefroot Arguments: .85
Perfectly Clear with whitepoint adjust at pixel (75,75)	retinex above with whitepoint adjust at pixel (75,75)	space above with whitepoint adjust at pixel (75,75)
Ranking: Omnistretch -- whitest snow Perfectly Clear -- color balance over-shifted a bit to the red (see snow) Space -- some haloing around people (whitepoint adjusted image has more even snow illumination and details, but less color) Retinex -- white artifact on left edge Coefroot -- slight horizontal artifacting Redist -- too much contrast

Original Image
Perfectly Clear™	omnistretch Arguments: -m RGB -acc 3	retinex Arguments: -m HSL -f 50
redist Arguments: -m HSL 50,80,80	space Arguments: -m .5 -b 1.5 -c 3 -w 5	coefroot Arguments: .85
Ranking: Space -- best balance of color and contrast Perfectly Clear -- a little too dark Coefroot -- a bit over textured Redist -- a bit under saturated Retinex -- a bit under saturated and too green Omnistretch -- a bit dark, under saturated and too green

Original Image
Perfectly Clear™	omnistretch Arguments: -m RGB -acc 3	retinex Arguments: -m HSL -f 0
redist Arguments: -m HSL 60,60,60	space Arguments: -m .5 -b 4 -c 5 -w 5	coefroot Arguments: .75
Ranking: Retinex -- best detail in person Omnistretch -- over all coloration, but person a bit dark Redist -- a bit too pastel coloration Space -- a bit under saturated Perfectly Clear -- too dark Coefroot -- way too dark