相关疑难解决方法(0)

我正在编写这种方法来计算图像的平均R,G,B值.以下方法将UIImage作为输入,并返回包含输入图像的R,G,B值的数组.我有一个问题:如何/我在哪里正确发布CGImageRef？

-(NSArray *)getAverageRGBValuesFromImage:(UIImage *)image
{
    CGImageRef rawImageRef = [image CGImage];

    //This function returns the raw pixel values
    const UInt8 *rawPixelData = CFDataGetBytePtr(CGDataProviderCopyData(CGImageGetDataProvider(rawImageRef)));

    NSUInteger imageHeight = CGImageGetHeight(rawImageRef);
    NSUInteger imageWidth = CGImageGetWidth(rawImageRef);

    //Here I sort the R,G,B, values and get the average over the whole image
    int i = 0;
    unsigned int red = 0;
    unsigned int green = 0;
    unsigned int blue = 0;

    for (int column = 0; column< imageWidth; column++)
    {
        int r_temp = 0;
        int g_temp = 0; …