2014/10/15 下午 10:13:38

iphone Programming Glossary: saturation

How can I change the saturation of an UIImage?

http://stackoverflow.com/questions/1144768/how-can-i-change-the-saturation-of-an-uiimage

can I change the saturation of an UIImage I have an UIImage and want to shift it's saturation about 10 . Are there standard methods or functions that.. can I change the saturation of an UIImage I have an UIImage and want to shift it's saturation about 10 . Are there standard methods or functions that can be used for this iphone cocoa touch uikit core graphics share.. Template create a new subclass of UIView like so header file @interface DesatView UIView UIImage image float saturation @property nonatomic retain UIImage image @property nonatomic float desaturation @end implementation file #import DesatView.h..

How to programmatically change the hue of UIImage?

http://stackoverflow.com/questions/11555071/how-to-programmatically-change-the-hue-of-uiimage

kCGBlendModeHue and draw with the appropriate hue. This is derived from Nitish's solution although I found that making saturation less than 1.0 had inconsistent results. This method does allow varying the alpha but for true saturation other than 100.. that making saturation less than 1.0 had inconsistent results. This method does allow varying the alpha but for true saturation other than 100 you will probably need a second round of drawing. UIImage imageWithImage UIImage source fixedHue CGFloat.. 0 0 Draw the hue on top of the image. CGContextSetBlendMode context kCGBlendModeHue UIColor colorWithHue hue saturation 1.0 brightness 1 alpha alpha set UIBezierPath imagePath UIBezierPath bezierPathWithRect imageExtent imagePath fill Retrieve..

color replacement in image for iphone application

http://stackoverflow.com/questions/15082025/color-replacement-in-image-for-iphone-application

able to understand arguments to be provided. 5 cvMerge the new image with the new hue with an image composed by the saturation and brightness channels that you saved in step one. i understand that cvMerge will merge three channel of H S and V but..

composite colors: CALayer and blend mode on iPhone

http://stackoverflow.com/questions/1658751/composite-colors-calayer-and-blend-mode-on-iphone

theLayer inContext CGContextRef myContext draw a white overlay with special blending and alpha values so that the saturation can be animated CGContextSetBlendMode myContext kCGBlendModeSaturation CGContextSetRGBFillColor myContext 1.0 1.0 1.0 0.9..

How to get RGB values from UIColor?

http://stackoverflow.com/questions/437113/how-to-get-rgb-values-from-uicolor

UIColor Im creating a color object using the following code. curView.backgroundColor UIColor alloc initWithHue 229 saturation 40 brightness 75 alpha 1 How can I retrieve RGB values from the created color object iphone rgb uicolor share improve..

How to draw a color wheel in objective-c

http://stackoverflow.com/questions/5108921/how-to-draw-a-color-wheel-in-objective-c

This is not exactly what you're trying to do looks like it's just hue varies in the circle with a constant luminance saturation but you should be able to adapt it for your needs. Note that this may not have optimal performance but it should get you.. void HSL2RGB float h float s float l float outR float outG float outB float temp1 temp2 float temp 3 int i Check for saturation. If there isn't any just return the luminance value for each which results in gray. if s 0.0 outR l outG l outB l return.. in gray. if s 0.0 outR l outG l outB l return Test for luminance and compute temporary values based on luminance and saturation if l 0.5 temp2 l 1.0 s else temp2 l s l s temp1 2.0 l temp2 Compute intermediate values based on hue temp 0 h 1.0 3.0 temp..

Change from RGB to HSB on iPhone?

http://stackoverflow.com/questions/5589804/change-from-rgb-to-hsb-on-iphone

code is just the important parts of the custom class I created for conversion. The HSBColor class stores just the hue saturation and brightness and I provide functions to get the components of it or a UIColor if I need to actually use it for something.. in the system. Note This code will not work as is unless you define an HSBColor class with hue brightness and saturation properties. void max int max andMin int min ofArray float array min 0 max 0 for int i 1 i 3 i if array i array max max.. 1 colorArray 2 int max int min self max max andMin min ofArray colorArray if max min toReturn.hue 0 toReturn.saturation 0 toReturn.brightness colorArray 0 else toReturn.brightness colorArray max toReturn.saturation colorArray max colorArray..

iOS: Positioning navigation bar buttons within custom navigation bar

http://stackoverflow.com/questions/6169474/ios-positioning-navigation-bar-buttons-within-custom-navigation-bar

drawRect CGRect rect Change the tint color in order to change color of buttons UIColor color UIColor colorWithHue 0.0 saturation 0.0 brightness 0.0 alpha 0.0 self.tintColor color Add a custom background image to the navigation bar UIImage image UIImage..

How to change a particular color in an image?

http://stackoverflow.com/questions/8046643/how-to-change-a-particular-color-in-an-image

and use the resulting mask to apply the new hue. cvMerge the new image with the new hue with an image composed by the saturation and brightness channels that you saved in step one. There are several OpenCV iOS ports in the net eg http www.eosgarden.com..

iOS - How to achieve emboss effect for the text on UILabel?

http://stackoverflow.com/questions/8467141/ios-how-to-achieve-emboss-effect-for-the-text-on-uilabel

33 UIImage interiorShadowImage self imageWithInteriorShadowAndString string font font textColor UIColor colorWithHue 0 saturation .9 brightness .7 alpha 1 size rect.size UIImage finalImage self imageWithUpwardShadowAndImage interiorShadowImage self.imageView.image..

Draw glow around inside edge of multiple CGPaths

http://stackoverflow.com/questions/8480401/draw-glow-around-inside-edge-of-multiple-cgpaths

NO 0.0 self drawInnerGlowWithPaths paths bounds self.imageView.bounds color UIColor colorWithHue 0 saturation 1 brightness .8 alpha .8 offset CGSizeZero blur 10.0 imageView.image UIGraphicsGetImageFromCurrentImageContext UIGraphicsEndImageContext..