Is there any particular reason why you need to invert the PCB image? And how are you producing the mask from the file?
If you're using a printer driver, then you need to make sure that this isn't scaling the output (such as having a "fit to page" option selected).
I regularly use the PDF export option, and import it into a program which does PDF reading, annotate it with my name, design name, logo and so forth, and then print it using a normal inkjet printer. But then I spent a lot of time making sure that the scaling wasn't a factor (however, I've never needed to invert the image)
Is there any particular reason why you need to invert the PCB image? And how are you producing the mask from the file?
If you're using a printer driver, then you need to make sure that this isn't scaling the output (such as having a "fit to page" option selected).
I regularly use the PDF export option, and import it into a program which does PDF reading, annotate it with my name, design name, logo and so forth, and then print it using a normal inkjet printer. But then I spent a lot of time making sure that the scaling wasn't a factor (however, I've never needed to invert the image)
Is it a photographic process (i.e. you need to provide it with a negative)? If so, how are you producing the photographic material? Is it printed out somehow?
(I'm just trying to gauge why you're having problems with scaling, and where those problems can lie).
