How do I create a solder resist pattern in Eagle?

Question

I have used photoshop to create a mask from the eagle print but it is tedious. There must be something I am missing in Eagle such as a ULP that would make it easier. Can anyone help me>

dukepro · Accepted Answer

On 11/23/2013 05:06 PM, billpenner wrote: Thanks for the help. I can print the Stop pattern but It is negative, that is I will have to make a transparency then make a photo film negative of that for a mask to the board. I am making the layouts, film positives, negatives then using dry film resist to make the PC boards and solder masks I am trying to eliminate some of the steps. I would like to eliminate all of the lithographic processes if possible. Bill, To my knowledge, Eagle can not produce a negative Gerber file. So you're left to external tools to do so. Maybe this will help: In Eagle, setup the CAM section normally to emit GERBER_RS274X and process the section to produce the desired Gerber file. For the top layer, include only the tStop layer, and the Dimension layer for alignment. For the bottom layer, use bStop and Dimension and be sure to mirror the layer. Using gerbv to view the Gerber file: o Set the layer color to pure white (#FFFFFF). o Click-right on the layer and choose "Invert Layer Color" o Print the layer. HTH, - Chuck 
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