I'm editing an image of a bronze statue of a horse and rider shot against the sky. The image is excessively blue of course and I want to mask out the statue so I can edit this spearately from the sky. It was shot in RAW on a Canon 450D.
As I'm creating the mask and I zoom in more, I notice I've left sky pixels behind. There also some purple fringing I'm noting at 100%, becoming quite clear at 200%. Understandably, I don't really want to zoom into something ridiculous to remove individual pixels.
How large a print would I have to make in order for the remaining blue pixels to be noticable? Bigger than A3 for example? Is there some way I can assess what the impact of those remaining pixels or the fringing will be, if there will be one at all?