cocoa - How can I display the spinning NSProgressIndicator in a different color?

Question

I am using a "spinner" NSProgressIndicator in my cocoa app:

I would like to display it in a different color so that it will show up well on a dark background:

How would I go about doing this? My last resort would be to write my own custom NSView subclass that renders a custom animation, but I'm not even sure where to start on that front. Any help is appreciated.

Answer 1

This is what I've done:

    #import <QuartzCore/QuartzCore.h>

    ...

    CIFilter *lighten = [CIFilter filterWithName:@"CIColorControls"];
    [lighten setDefaults];
    [lighten setValue:@1 forKey:@"inputBrightness"];
    [self.indicator setContentFilters:[NSArray arrayWithObjects:lighten, nil]];