Shadows/Highlights

Use this tool to independently influence the highlights and the shadows of the image.

Sharp Mask

• Shadows/Highlights
• 

  The source image.

• 

  "Sharp mask" turned off.

• 

  "Sharp mask" turned on.

In order to separate the dark areas from the light ones, a lightness mask (invisible to the user) is created. There are two algorithms for doing this; one blurs the image, while the other retains sharp edges between light and dark zones. Neither one is "better", both have their own merits. The soft mask approach can lead to halos, but it is quick. The sharp mask is slow, but it doesn't cause halos, though it can cause edge artifacts at close inspection.

Highlights

The Highlights slider makes the brightest parts of the image less bright without touching the darker tones. To make the effect stronger, use higher values. A slider value of 100 will turn the whites light gray.

Tonal Width for Highlights

This slider controls the strength of the Highlights slider. Higher values give a stronger effect. A value of 100, combined with Highlights 100, turns the whites into middle gray (you probably won't want that...).

Shadows

This slider lifts the shadows and applies an effect that is sometimes called 'fill-light' (or 'fill-flash') in other software. Higher values lighten the shadow areas more.

Tonal Width for Shadows

This slider controls the strength of the Shadows slider. A maximum value of 100 gives the strongest 'lift shadows' effect.

Radius

The value of the Radius slider influences the Highlights, Shadows and Local Contrast sliders. The larger the radius, the stronger the effect of local contrast. The effective area of the Highlights and Shadows sliders also increases.

If you are bored, set the first four sliders to 100 and play with Local Contrast to transform your favorite raw processor into a cheap effect machine!