改变iphone sdk中的图像颜色

Question

我有一张图片＆amp;我想以编程方式更改该图像的颜色。

＆安培; 我想更改此图片的颜色

Answer 1

<强>更新

使用此方法...

-(UIImage *)imageNamed:(NSString *)name withColor:(UIColor *)color {
    // load the image

    UIImage *img = [UIImage imageNamed:name];

    // begin a new image context, to draw our colored image onto
    UIGraphicsBeginImageContext(img.size);

    // get a reference to that context we created
    CGContextRef context = UIGraphicsGetCurrentContext();

    // set the fill color
    [color setFill];

    // translate/flip the graphics context (for transforming from CG* coords to UI* coords
    CGContextTranslateCTM(context, 0, img.size.height);
    CGContextScaleCTM(context, 1.0, -1.0);

    // set the blend mode to color burn, and the original image
    CGContextSetBlendMode(context, kCGBlendModeColorBurn);
    CGRect rect = CGRectMake(0, 0, img.size.width, img.size.height);
    CGContextDrawImage(context, rect, img.CGImage);

    // set a mask that matches the shape of the image, then draw (color burn) a colored rectangle
    CGContextClipToMask(context, rect, img.CGImage);
    CGContextAddRect(context, rect);
    CGContextDrawPath(context,kCGPathFill);

    // generate a new UIImage from the graphics context we drew onto
    UIImage *coloredImg = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    //return the color-burned image
    return coloredImg;
}

像下面那样使用它......

yourImageView.image = [self imageNamed:@"yourImageName" withColor:[UIColor orangeColor]];

希望这对你有帮助.....

Answer 2

感谢您的方法 - 它的工作原理。然而，在图像质量方面，我找到了答案，以提供更准确的彩色图像：

https://stackoverflow.com/a/4630136/917802

Answer 3

这是Swift版本：

extension UIImage {

    func colorizeWith(color: UIColor) -> UIImage {
        UIGraphicsBeginImageContext(self.size)
        let context = UIGraphicsGetCurrentContext()
        color.setFill()
        CGContextTranslateCTM(context, 0, self.size.height)
        CGContextScaleCTM(context, 1.0, -1.0)

        // set the blend mode to color burn, and the original image
        CGContextSetBlendMode(context, kCGBlendModeNormal);
        let rect = CGRectMake(0, 0, self.size.width, self.size.height);
        CGContextDrawImage(context, rect, self.CGImage);

        // set a mask that matches the shape of the image, then draw (color burn) a colored rectangle
        CGContextClipToMask(context, rect, self.CGImage);
        CGContextAddRect(context, rect);
        CGContextDrawPath(context,kCGPathFill);

        // generate a new UIImage from the graphics context we drew onto
        let coloredImage = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();

        //return the color-burned image
        return coloredImage;
    }

}

Answer 4

你可以尝试Ankish Jain's answer，它对我有用。

theImageView.image = [theImageView.image imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
[theImageView setTintColor:[UIColor redColor]];

Answer 5

CoreImage Color Filters非常适合这类任务 - 我发现它们比使用Core Graphic类（CG ...）稍微简单一点：它们可以让你调整我拥有的图像的RGB和Alpha特征一直用它们来改变QRCode的白色背景。在你的情况下，白色的RGBA是（1,1,1,1）我相信你必须扭转颜色。只需查看Apple的CI文档，有几十个可用的过滤器CIColorMatrix只是其中之一。

CIImage *beginImage = [CIImage imageWithCGImage:image.CGImage];

CIContext *context = [CIContext contextWithOptions:nil];

CIFilter *filtercd = [CIFilter filterWithName:@"CIColorMatrix"  //rgreen
                                keysAndValues: kCIInputImageKey, beginImage, nil];
[filtercd setValue:[CIVector vectorWithX:0 Y:1 Z:1 W:0] forKey:@"inputRVector"]; // 5
[filtercd setValue:[CIVector vectorWithX:1 Y:0 Z:1 W:0] forKey:@"inputGVector"]; // 6
[filtercd setValue:[CIVector vectorWithX:1 Y:1 Z:0 W:0] forKey:@"inputBVector"]; // 7
[filtercd setValue:[CIVector vectorWithX:0 Y:0 Z:0 W:1] forKey:@"inputAVector"]; // 8
[filtercd setValue:[CIVector vectorWithX:1 Y:1 Z:0 W:0] forKey:@"inputBiasVector"]; 
CIImage *doutputImage = [filtercd outputImage];


CGImageRef cgimgd = [context createCGImage:doutputImage fromRect:[doutputImage extent]];
UIImage *newImgd = [UIImage imageWithCGImage:cgimgd];

filterd.image = newImgd;

CGImageRelease(cgimgd);

Answer 6

我在这里回答iPhone - How do you color an image?我认为从iOS 7着色图像的最佳方法是使用

myImageView.image = [[UIImage imageNamed:@"myImage"] imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];

然后更改imageView的tintColor或包含图像的任何内容。