获取图片每像素颜色值

关于获取图片每像素颜色值

以下是oc及swift实现

swift：

func getimageColorarray(_ image:UIImage) ->[[(CGFloat,CGFloat,CGFloat,CGFloat)]] {
        var colorA = [[(CGFloat,CGFloat,CGFloat,CGFloat)]]()
        //        image.cgImage.sc
        let pixelData = image.cgImage?.dataProvider?.data
        let data:UnsafePointer<UInt8> = CFDataGetBytePtr(pixelData)
        let length = CFDataGetLength(pixelData)

        for x in 0..<Int(image.size.height) {
            var colorR = [(CGFloat,CGFloat,CGFloat,CGFloat)]()
            for y in 0..<Int(image.size.width) {

                let pixelInfo: Int = ((Int(image.size.width)*Int(y)) + Int(x)) * 4

                let r = CGFloat(data[pixelInfo])
                let g = CGFloat(data[pixelInfo+1])
                let b = CGFloat(data[pixelInfo+2])
                let a = CGFloat(data[pixelInfo+3])

                let rgba = (r,g,b,a)
                colorR.append(rgba)
            }
            colorA.append(colorR)
        }

        return colorA
    }

object-c：

+(NSMutableArray*)imageFunc:(UIImage *)image{
NSMutableArray *colorArray = [NSMutableArray array];
const int imageWidth = image.size.width;
const int imageHeight = image.size.height;
size_t bytesPerRow = imageWidth * 4;
uint32_t *rgbImageBuf = (uint32_t *)malloc(bytesPerRow * imageHeight);
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef context = CGBitmapContextCreate(rgbImageBuf, imageWidth, imageHeight, 8, bytesPerRow, colorSpace, kCGBitmapByteOrder32Little | kCGImageAlphaNoneSkipLast);
CGContextDrawImage(context, CGRectMake(0, 0, imageWidth, imageHeight), image.CGImage);

int pixelNum = imageWidth * imageHeight;
uint32_t* pCurPtr = rgbImageBuf;

for (int i = 0; i < pixelNum; i++, pCurPtr++){
    NSMutableArray  *colorRow = [NSMutableArray array];
    uint8_t *ptr = (uint8_t *)pCurPtr;
    int r = ptr[0];
    int g = ptr[1];
    int b = ptr[2];
    int a = ptr[3];
    [colorRow addObject:[[NSNumber alloc] initWithInt:r]];
    [colorRow addObject:[[NSNumber alloc] initWithInt:g]];
    [colorRow addObject:[[NSNumber alloc] initWithInt:b]];
    [colorRow addObject:[[NSNumber alloc] initWithInt:a]];

    [colorArray addObject:colorRow];
}
CGContextRelease(context);
CGColorSpaceRelease(colorSpace);
return colorArray;
}