The Spray brush imitates spraying paint on an image. It does not apply paint in a continuous layer but rather as droplets scattered along the stroke.
You can change the paint color using the Color panel, Swatches panel, Color Wheel panel, or by clicking the image with the Eyedropper tool. To pick a color sample, press and hold the I key and then click the image with the Eyedropper tool. After the hotkey is released, the painting tool becomes active again.
The basic tool settings are shown in the Tool Options panel above the Image Window. To display the full list of parameters, press the tool icon in the Tool Options panel, or right-click the image. To specify the parameter settings, enter a numerical value in the parameter’s field or use the slider.
Size (1-1000). The maximum width of a line made by the brush (in pixels).
Opacity (1-100). The permeability of brush strokes in relation to the background color. This parameter sets the opacity of paint applied to the image: at lower values drop color becomes lighter and interacts more with the background color.
Drop Density (1-100). The amount of spots in a stroke. At higher values of this parameter the spray becomes denser.
Drop Size (1-50). The diameter of individual drops. Larger drops will merge, forming an irregularly shaped line with rough edges.
Intensity (1-100). The intensity of drop color in a single stroke. As drops are sprayed their interaction with one another increases. The lower the value of this parameter, the paler the paint color.
Beside the above-listed settings, some additional parameters are available for this tool.
Press the Default button to set all settings to their default values.
To spray paint along a straight line, Left-click to set the starting point, then hold down Shift, move the cursor, click on and end point and release Shift. If Shift is not released, the line will be drawn following all selected points.