- (UIImage *)imageWithImage: (UIImage *)sourceImage {

i_width = 640; // Neue Breite für das Bild

float oldWidth = sourceImage.size.width;
float scaleFactor = i_width / oldWidth;

float newHeight = sourceImage.size.height * scaleFactor;
float newWidth = oldWidth * scaleFactor;

UIGraphicsBeginImageContext(CGSizeMake(newWidth, newHeight));
[sourceImage drawInRect:CGRectMake(0, 0, newWidth, newHeight)];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

return newImage;

}