Preserve transparency
This option is used to protect areas of a layer that has no imagery and is often used to paint over objects on that layer without affecting the surrounding empty space.
To see how this works, make a new empty layer (Layers> New Layer) and select the
Pencils> Grainy Cover Pencil 3 with a size of about 35% and Opacity 100%. Paint into the picture with any color but leave plenty of blank areas. Tick the Preserve Transparency box and change the paint color. Paint all across the layer and you will see that the paint has only recorded in the areas that already have some imagery while the areas that were transparent have been preserved untouched, hence the name. Now turn off the Preserve Transparency option and paint again. This time the paint is laid down wherever the brush is used.
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