Last year Adobe added the ability to apply a range mask to the adjustment brush tools in Lightroom, but photographers have mostly forgotten about this powerful option. Here is why you should be using range masks more frequently when editing your photos.
All Lightroom users are familiar with the software’s adjustment brush and gradient tools to some extent. These options give users more control by providing a way to add a specific adjustment to a localized area of an image. The range mask, however, allows photographers to take that control a step further. This tool enables you to restrict the application of an adjustment to only a specific luminance or color value. In this video from PHLEARN, Aaron Nace teaches how to use the luminance version of the mask to edit an image in Lightroom.
Nace has a practical purpose for range masks, using the luminance mask to make adjustments to only the highlights or the shadows in the selected area to essentially dodge and burn the image. The mask allows him to avoid the luminance values that he doesn’t want to affect. I will also add that the color version of the mask is a great way to add an effect to a specific part of an image without the need to paint perfectly with the brush tool. For example, you can paint an effect over a subject's entire face, and then use the color range mask to only apply the adjustments to their skin or their hair by selecting those colors. You can also hold shift when using the color picker to apply the effect to multiple colors.
The range mask has been available for a while, but it is still overlooked. If you haven't implemented this technique in your editing, take a look at the video above.