Any progress about the PDF Grey/White stripes Bug?


I get white grey strips/ on the copper filled part of the PCB.

I dont really need to explain just look at the picture ( open it ), this happens with almost all of my boards whenever i export a pdf. Since im home etching i can just open gimp and paint them one by one using the bucket tool, but its an just an extra annoying step when dealing with a complex double sided PCBs
there has been older discussions about it before

but it looks like there no progress to report …


Wow, you’re right.

It only puts lines in the ground plane, not the traces.

Mine does it in V0.9.2 and V0.9.3.

I’m doing the toner transfer method but I don’t add the ground plane, so I haven’t noticed it.

I exported as a Gerber in V0.9.3 and the lines aren’t there, but in V0.9.2 there is one line.


Im using 0.92
It looks like they couldn’t track down the problem so they didnt much care about it since it doesn’t effect the circuit ( traces ) and it also doesnt effect the board when ordering it ( at least according to replies from old forum discussions )
but it certainly does effect my home toner transfer so i have to some how get rid of them


In the Gerber it looks ok, so you can export for production the Gerbers and get a Gerber program to display it, I use KiCad GerbView, and then print off that.

There is an online Gerbviewer, but I don’t know how that works.


I just remembered that Gerber doesn’t have the drill hole in the centre, and that means that the drill guide spot is missing from the centre making it hard to locate the drill unless you put a centrepunch in the centre first.


Sorry, but don’t worry about these! They are just rendering artefacts and won’t affect your print or production. The copper fill is created with a scanline algorithm, so it’s basically hundreds of black rectangles stacked vertically. There is no gap between them, though, but the PDF viewer sometimes displays them as 1px white/grey lines.

I admit it’s confusing… There’s a patch from Nicolas Raynaud to replace the scanline algorithm with a proper boolean-based area merging, but it’s not quite there yet:

Anyway, as I said, it should not influence your etching process.