[英]CIFilter how to turn white imageView.image with transparency to any color
我正在尝试以编程方式将白色imageView.image转换为不同的颜色。 轮廓当前为白色。
我正在尝试将此解决方案与CIFilter结合使用,但是图像根本不会出现。
这是粘贴的代码以供参考:
- (UIImage *) filterImage: (CIImage *)beginImage color: (UIColor *) color{
CIImage *output = [CIFilter filterWithName:@"CIColorMonochrome" keysAndValues:kCIInputImageKey, beginImage, @"inputIntensity", [NSNumber numberWithFloat:1.0], @"inputColor", [[CIColor alloc] initWithColor:color], nil].outputImage;
CIContext *context = [CIContext contextWithOptions:nil];
CGImageRef cgiimage = [context createCGImage:output fromRect:output.extent];
UIImage *newImage = [UIImage imageWithCGImage:cgiimage];
CGImageRelease(cgiimage);
return newImage;
}
解决方案.h文件
#import <UIKit/UIKit.h>
@interface ViewController : UIViewController
@property (weak, readwrite, nonatomic) IBOutlet UIImageView *imgView;
@end
解决方案.m文件
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
CIImage *inputImage = [CIImage imageWithCGImage:[UIImage imageNamed:@"NJDLv"].CGImage];
self.imgView.image = [self filterImage:inputImage color:[UIColor yellowColor]];
}
- (UIImage *) filterImage: (CIImage *)beginImage color: (UIColor *) color{
CIColor *ciColor = [CIColor colorWithCGColor:color.CGColor];
CIImage *output = [CIFilter filterWithName:@"CIColorMonochrome"
keysAndValues:kCIInputImageKey, beginImage,
@"inputIntensity",@(1.0),
@"inputColor", ciColor, nil].outputImage;
CIContext *context = [CIContext contextWithOptions:nil];
CGImageRef cgiimage = [context createCGImage:output fromRect:output.extent];
UIImage *newImage = [UIImage imageWithCGImage:cgiimage];
CGImageRelease(cgiimage);
return newImage;
}
@end
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