Setting the color of the solder mask
To set the color of the solder mask click on the button. The color selector dialog will appear. Make sure to make it semi-transparent so you can see through it when it is displayed. You can make it semi-transparent by dragging the T slider shown below.
Solder mask color
Removing a pad's cutout
Normally a pad generates its own solder mask cutout. However you may want to define a custom no solder mask area and do not want the pad to automatically create a no solder mask region. You do this by selecting the pad and unchecking the Add Solder Cutouts checkbox in the pads properties panel.
Adding a custom soldermask cutout
You can add a custom solder mask cutout to the top or bottom side of the PCB. To add one you must have either the top copper layer or the bottom copper layer selected. You can do this using the layers panel.
A custom solder mask cutout can be rectangular (with optional rounded corners) or circular/elliptical or polygonal/curved.
Rotating a soldermask cutout
1.To rotate a cutout select the cutout by clicking on one of its edges.
Scaling a soldermask cutout
1.To cutout a cutout select the cutout by clicking on one of its edges.
2.Drag one of the edge manipulators to scale it. See scaling objects for more.
Moving a soldermask cutout
To move a soldermask cutout, hold down the left mouse key over the cutouts edge and drag it.
Deleting a soldermask cutout
Select the cutout and press the DEL key.