Adjust Image Contrast

Drop your photos in and move the slider: the result appears right away, and a curtain over the image shows the before and after.

Contrast slider

Contrast pulls light and dark away from the middle: at +100 the difference between them triples, and at −100 the photo turns flat gray. The slider works the same way as the contrast control on the Adjust Image Brightness page, where you can also fix brightness and saturation.

Auto contrast

The button stretches the brightness of each photo on its own: the darkest points become black and the brightest ones become white. Half a percent of the extreme points stay out of the calculation, so a single bright lamp or glare does not spoil the stretch. A washed-out photo taken in fog or through glass stretches no more than threefold, otherwise noise would show up. The strength of the stretch shows on the slider.