Below these tools in the panel are three sliders - Size, Feather and Opacity:
o Size refers to the size of the brush, controlling how large an area you cover.
o Feather refers to the harshness of the brush circle. A softer brush may allow for more seamless cover-ups but may also introduce unwanted blurriness into your photo.
o Opacity refers to the transparency of the effect and sample area. You can use this to do your healing very gradually and to create subtle healing on your photo. Note: Content Aware Remove hasn't got an Opacity option.
Selecting and adjusting areas of an image with masking
Masking enables you to make intricate and precise adjustments to any part of an image. You can apply as many masks as needed to make the image look exactly how you imagined it.
This is done through manual tools such as a brush, radial or linear gradient or AI driven tools such as subject selection, people selection, sky selections and more. With the manual tools, you create the selection that you want, with the AI driven masks, Lightroom make the selection for you (subject, background, sky, object and people), so you can focus on the other elements of photo editing.
After creating a mask, you can use powerful adjustments to change colour, tone, texture and more to selective areas. Multiple tools can be used in combination with one another within a single mask making it easy to select and adjust exactly what you want to effect in a photograph.
How to mask in Lightroom
Jump into Masking mode by clicking the Mask button on the right-hand side. At the top of the panel is Lightroom’s AI features which can automatically detect and create masks for the subject, sky and background of a photo.
In addition, you can choose Objects to select objects which may not be the primary subject in a photograph and use “Select People” to have Lightroom automatically find people in a photo and create masks for the entire person or create a mask based on more granular attributes and adjust areas such as eyes, skin, hair and clothing. These one-click solutions really speeds up the process and can transform your workflow.