right example has the brightness adjusted, which does make the shadows lighter, but results in the image looking washed out as some lighter and mid-tone shades have also been lightened.Only the shadowed area has been enhanced, the mid and bright tones of the sky have not been altered.
Highlights control
The Highlights adjustment similarly can reduce the brightness of the very brightest parts of the image.The highlights have been reduced on the example on the right, revealing more details of the quilt pattern without affecting the brightness of other parts of the image.Note neither function can bring back data that is missing from the original photo. For example it’s common with many lower-end digital cameras that really bright areas will clip or ‘burn out’ (e.g. clouds) and just show as pure white. The Highlights tool cannot bring back detail missing from such clipped whites.