UIImagePNGRepresentation和蒙版图像
我使用iphone博客的函数创建了一个蒙版图像：
UIImage * imgToSave = [self maskImage：[UIImage imageNamed：@“pic.jpg”] withMask：[UIImage imageNamed：@“sd-face-mask.png”]];
在UIImageView中看起来不错
UIImageView *imgView = [[UIImageView alloc] initWithImage:imgToSave];
imgView.center = CGPointMake(160.0f, 140.0f);
[self.view addSubview:imgView];
没有找到相关结果
已邀请:
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揽芳僵迷仇
// MyImageHelperObj.h @interface MyImageHelperObj : NSObject + (UIImage *) createGrayScaleImage:(UIImage*)originalImage; + (UIImage *) createMaskedImageWithSize:(CGSize)newSize sourceImage:(UIImage *)sourceImage maskImage:(UIImage *)maskImage; @end // MyImageHelperObj.m #import <QuartzCore/QuartzCore.h> #import "MyImageHelperObj.h" @implementation MyImageHelperObj + (UIImage *) createMaskedImageWithSize:(CGSize)newSize sourceImage:(UIImage *)sourceImage maskImage:(UIImage *)maskImage; { // create image size rect CGRect newRect = CGRectZero; newRect.size = newSize; // draw source image UIGraphicsBeginImageContextWithOptions(newRect.size, NO, 0.0f); [sourceImage drawInRect:newRect]; UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext(); // draw mask image [maskImage drawInRect:newRect blendMode:kCGBlendModeNormal alpha:1.0f]; maskImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); // create grayscale version of mask image to make the "image mask" UIImage *grayScaleMaskImage = [MyImageHelperObj createGrayScaleImage:maskImage]; CGFloat width = CGImageGetWidth(grayScaleMaskImage.CGImage); CGFloat height = CGImageGetHeight(grayScaleMaskImage.CGImage); CGFloat bitsPerPixel = CGImageGetBitsPerPixel(grayScaleMaskImage.CGImage); CGFloat bytesPerRow = CGImageGetBytesPerRow(grayScaleMaskImage.CGImage); CGDataProviderRef providerRef = CGImageGetDataProvider(grayScaleMaskImage.CGImage); CGImageRef imageMask = CGImageMaskCreate(width, height, 8, bitsPerPixel, bytesPerRow, providerRef, NULL, false); CGImageRef maskedImage = CGImageCreateWithMask(newImage.CGImage, imageMask); CGImageRelease(imageMask); newImage = [UIImage imageWithCGImage:maskedImage]; CGImageRelease(maskedImage); return [UIImage imageWithData:UIImagePNGRepresentation(newImage)]; } + (UIImage *) createGrayScaleImage:(UIImage*)originalImage; { //create gray device colorspace. CGColorSpaceRef space = CGColorSpaceCreateDeviceGray(); //create 8-bit bimap context without alpha channel. CGContextRef bitmapContext = CGBitmapContextCreate(NULL, originalImage.size.width, originalImage.size.height, 8, 0, space, kCGImageAlphaNone); CGColorSpaceRelease(space); //Draw image. CGRect bounds = CGRectMake(0.0, 0.0, originalImage.size.width, originalImage.size.height); CGContextDrawImage(bitmapContext, bounds, originalImage.CGImage); //Get image from bimap context. CGImageRef grayScaleImage = CGBitmapContextCreateImage(bitmapContext); CGContextRelease(bitmapContext); //image is inverted. UIImage inverts orientation while converting CGImage to UIImage. UIImage* image = [UIImage imageWithCGImage:grayScaleImage]; CGImageRelease(grayScaleImage); return image; } @end刷骸码