How to compare UIColors?

I'd like to check the color set for a background on a UIImageView. I've tried:

if(myimage.backgroundColor == [UIColor greenColor]){
...}
else{
...}

but that doesn't work, even when I know the color is green, it always falls into the else part.

Also, is there a way to output the current color in the debug console.

p [myimage backgroundColor]

and

po [myimage backgroundColor]

don't work.

Have you tried [myColor isEqual:someOtherColor] ?

As zoul pointed out in the comments, isEqual: will return NO when comparing colors that are in different models/spaces (for instance #FFF with [UIColor whiteColor]). I wrote this UIColor extension that converts both colors to the same color space before comparing them:

- (BOOL)isEqualToColor:(UIColor *)otherColor {
    CGColorSpaceRef colorSpaceRGB = CGColorSpaceCreateDeviceRGB();

    UIColor *(^convertColorToRGBSpace)(UIColor*) = ^(UIColor *color) {
        if (CGColorSpaceGetModel(CGColorGetColorSpace(color.CGColor)) == kCGColorSpaceModelMonochrome) {
            const CGFloat *oldComponents = CGColorGetComponents(color.CGColor);
            CGFloat components[4] = {oldComponents[0], oldComponents[0], oldComponents[0], oldComponents[1]};
            CGColorRef colorRef = CGColorCreate( colorSpaceRGB, components );

            UIColor *color = [UIColor colorWithCGColor:colorRef];
            CGColorRelease(colorRef);
            return color;            
        } else
            return color;
    };

    UIColor *selfColor = convertColorToRGBSpace(self);
    otherColor = convertColorToRGBSpace(otherColor);
    CGColorSpaceRelease(colorSpaceRGB);

    return [selfColor isEqual:otherColor];
}