给图片增加高斯模糊效果

来源：互联网发布：提高手机网速软件编辑：程序博客网时间：2024/05/16 07:52

前一阵研究了图片的滤镜效果，今天单独把高斯模糊的拿出来，供小伙伴们一起学习。

高斯模糊的效果其实灰常简单，苹果这边已经给了一些现成的封装CIFilter，下面一起来看一看代码吧~

////  ViewController.m//  GS////  Created by a111 on 16/3/7.//  Copyright © 2016年 司小文. All rights reserved.//#import "ViewController.h"#define nav 64 //导航条高度#define imgViewH 200 //图片高度@interface ViewController (){    CIFilter *filter;//全局filter    UIImageView *_imgView_Top;//上方图片    UIImage *_img_original;//原始图片    float radius;//高斯模糊度}@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    self.title = @"高斯模糊demo";        //高斯模糊度 （这个数值由你自己设定，越大模糊度越高）    radius = 10.;        //原始图片img    _img_original = [UIImage imageNamed:@"20140622212336_N284Y.jpg"];        //图片    _imgView_Top = [[UIImageView alloc] initWithFrame:CGRectMake(0, nav, self.view.frame.size.width,imgViewH)];    _imgView_Top.image = _img_original;    [self.view addSubview:_imgView_Top];        //高斯模糊    filter = [CIFilter filterWithName:@"CIGaussianBlur"];    [filter setValue:@(radius) forKey:@"inputRadius"];        //将图片转换成文件    NSData *imageData = UIImagePNGRepresentation(_img_original);        //将文件转换成CIImage    CIImage *beginImage =[CIImage imageWithData:imageData];        //模式    [filter setValue:beginImage forKey:kCIInputImageKey];        //渲染并输出CIImage    CIImage *outputImage = [filter outputImage];        //获取绘制上下文    CIContext *context = [CIContext contextWithOptions:nil];        //创建CGImage句柄    CGImageRef cgimg = [context createCGImage: outputImage fromRect:[beginImage extent]];        //获取图片    UIImage *newImage = [UIImage imageWithCGImage:cgimg];        //释放CGImage句柄    CGImageRelease(cgimg);        //赋值img    _imgView_Top.image = newImage;        // Do any additional setup after loading the view, typically from a nib.}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}@end

下图为模拟器效果

demo链接：高斯模糊--司小文（提取码：978c）

感谢观看，学以致用更感谢。

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