2014/10/15 下午 10:10:10

iphone Programming Glossary: image.cgimage

How can I change the saturation of an UIImage?

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

flip image right side up CGContextScaleCTM context 1.0 1.0 CGContextDrawImage context rect self.image.CGImage CGContextSetBlendMode context kCGBlendModeSaturation CGContextClipToMask context self.bounds image.CGImage restricts drawing.. rect self.image.CGImage CGContextSetBlendMode context kCGBlendModeSaturation CGContextClipToMask context self.bounds image.CGImage restricts drawing to within alpha channel CGContextSetRGBFillColor context 0.0 0.0 0.0 desaturation CGContextFillRect context..

OpenCV install in xcode

http://stackoverflow.com/questions/12214273/opencv-install-in-xcode

UIImage UIImageFromCVMat cv Mat cvMat withUIImage UIImage image CGColorSpaceRef colorSpace CGImageGetColorSpace image.CGImage CGFloat cols image.size.width CGFloat rows image.size.height CGFloat widthStep image.size.width CGContextRef contextRef.. colorSpace kCGImageAlphaNoneSkipLast kCGBitmapByteOrderDefault CGContextDrawImage contextRef CGRectMake 0 0 cols rows image.CGImage CGContextSetRGBStrokeColor contextRef 1 0 0 1 CGImageRef cgImage CGBitmapContextCreateImage contextRef UIImage result UIImage.. colorSpace return finalImage cv Mat cvMatFromUIImage UIImage image CGColorSpaceRef colorSpace CGImageGetColorSpace image.CGImage CGFloat cols image.size.width CGFloat rows image.size.height cv Mat cvMat rows cols CV_8UC4 CGContextRef contextRef CGBitmapContextCreate..

Cropping an image in iOS using OpenCV face detection

http://stackoverflow.com/questions/14756505/cropping-an-image-in-ios-using-opencv-face-detection

its because of Rotation issue. I have Rotated the Image as below. UIImage rotateImage UIImage alloc initWithCGImage image.CGImage scale 1.0 orientation UIImageOrientationRight And Cropped the image using the below Code get sub image UIImage getSubImageFrom..

CGImage/UIImage lazily loading on UI thread causes stutter

http://stackoverflow.com/questions/1815476/cgimage-uiimage-lazily-loading-on-ui-thread-causes-stutter

it is decompressing the JPEG data. Anyway the method is void forceLazyLoadOfImage UIImage image CGImageRef imgRef image.CGImage CGFloat currentWidth CGImageGetWidth imgRef CGFloat currentHeight CGImageGetHeight imgRef CGRect bounds CGRectMake 0.0f..

UISearchBar clear background color or set background image [iphone sdk]

http://stackoverflow.com/questions/2139115/uisearchbar-clear-background-color-or-set-background-image-iphone-sdk

CGContextScaleCTM contenxt 1.0 1.0 CGContextDrawImage contenxt CGRectMake 0 0 image.size.width image.size.height image.CGImage @end @ .h #import Foundation Foundation.h #import QuartzCore QuartzCore.h @interface UISearchBar CustomBackground @end Hope..

How to crop the UIImage?

http://stackoverflow.com/questions/2635371/how-to-crop-the-uiimage

CGBitmapContextCreate void pixels image.size.width image.size.height 8 image.size.width 4 CGImageGetColorSpace image.CGImage kCGImageAlphaPremultipliedLast if context NULL Draw the image in the bitmap CGContextDrawImage context CGRectMake 0.0f.. NULL Draw the image in the bitmap CGContextDrawImage context CGRectMake 0.0f 0.0f image.size.width image.size.height image.CGImage NSUInteger numberOfPixels image.size.width image.size.height NSMutableArray numberOfPixelsArray NSMutableArray alloc initWithCapacity..

Convert Image to B&W problem CGContext - iPhone Dev

http://stackoverflow.com/questions/3340564/convert-image-to-bw-problem-cgcontext-iphone-dev

bug. Heres the code snippet UIImage rotateImage UIImage image int kMaxResolution 320 Or whatever CGImageRef imgRef image.CGImage CGFloat width CGImageGetWidth imgRef CGFloat height CGImageGetHeight imgRef CGAffineTransform transform CGAffineTransformIdentity..

How to display an image on a MKOverlayView?

http://stackoverflow.com/questions/3891850/how-to-display-an-image-on-a-mkoverlayview

RadarOverlay self.overlay UIImage image UIImage alloc initWithData radarOverlay.radarData CGImageRef imageReference image.CGImage MKMapRect theMapRect self.overlay boundingMapRect CGRect theRect self rectForMapRect theMapRect CGRect clipRect self rectForMapRect..

ASSETWriterInput for making Video from UIImages on Iphone Issues

http://stackoverflow.com/questions/3983882/assetwriterinput-for-making-video-from-uiimages-on-iphone-issues

videoWriter startSessionAtSourceTime kCMTimeZero Write samples CVPixelBufferRef buffer Utils pixelBufferFromCGImage image.CGImage size size adaptor appendPixelBuffer buffer withPresentationTime kCMTimeZero adaptor appendPixelBuffer buffer withPresentationTime..

CGContextDrawImage draws image upside down when passed UIImage.CGImage

http://stackoverflow.com/questions/506622/cgcontextdrawimage-draws-image-upside-down-when-passed-uiimage-cgimage

And then simply asking core graphics to draw it to my context CGContextDrawImage context CGRectMake 0 0 145 15 image.CGImage It renders in the right place and dimensions but the image is upside down. I must be missing something really obvious here.. cgcontextdrawimage share improve this question Instead of CGContextDrawImage context CGRectMake 0 0 145 15 image.CGImage Use image drawInRect CGRectMake 0 0 145 15 In the middle of your begin end CGcontext methods. This will draw the image with..

How do I create an image overlay and add to MKMapView?

http://stackoverflow.com/questions/5283741/how-do-i-create-an-image-overlay-and-add-to-mkmapview

zoomScale inContext CGContextRef ctx UIImage image UIImage imageNamed @ image.png retain CGImageRef imageReference image.CGImage MKMapRect theMapRect self.overlay boundingMapRect CGRect theRect self rectForMapRect theMapRect CGRect clipRect self rectForMapRect..

UIImagePickerController camera preview is portrait in landscape app

http://stackoverflow.com/questions/538041/uiimagepickercontroller-camera-preview-is-portrait-in-landscape-app

messageID 7949889 UIImage scaleAndRotateImage UIImage image int kMaxResolution 640 Or whatever CGImageRef imgRef image.CGImage CGFloat width CGImageGetWidth imgRef CGFloat height CGImageGetHeight imgRef CGAffineTransform transform CGAffineTransformIdentity..

Free barcode scanner SDK for iOS (iPhone) [closed]

http://stackoverflow.com/questions/5659380/free-barcode-scanner-sdk-for-ios-iphone

ZBarReaderController reader ZBarReaderController new reader.readerDelegate self ... code to get image CGImageRef imgCG image.CGImage id NSFastEnumeration results reader scanImage imgCG ZBarSymbol symbol nil for symbol in results break resultText.text symbol.data..

Getting RGB pixel data from CGImage

http://stackoverflow.com/questions/6073259/getting-rgb-pixel-data-from-cgimage

you can adapt it to your needs void imageDump NSString file UIImage image UIImage imageNamed file CGImageRef cgimage image.CGImage size_t width CGImageGetWidth cgimage size_t height CGImageGetHeight cgimage size_t bpr CGImageGetBytesPerRow cgimage size_t..