Open the Brush Dynamics submenu in the Toolbox and make sure only the bottom-right ( Random Color) check is active. Create a new layer and call it “Color.” Then select the Paintbrush Tool ( P), choose the largest “Fuzzy” brush- Circle Fuzzy (19)-and drag the Scale slider to 10.0 (giving you a brush size of 190 pixels).
Plain white nebulae are a bit dull though-we need to add some color.
So the stars are perfectly visible in the other parts of the image. Uncheck Show Layer Mask, and have a look: since we made our layer mask by copying the original Nebulae layer, the only parts of it that are transparent are areas where there are nebulae. It will be unnecessary to do any of this for our image, however.
