I could manage to take a "decent" photo of what I'm refering to with the LED's: enter image description here

Is that caused by the printer? This is how the LED's are drawn:


\usepackage[a4paper, margin=2cm]{geometry}

        \draw[color=blue] (0,0) -- (2,0)node[fulllediodeshape,scale=0.7,color=black](q0){}; 


I'm printing on paper a circuit that has multiple elements with color, and some of them seem to appear with two kind of colors one darker than the other. Here for example you see a node (circ node) that has like an outer ring of darker color than the center:

enter image description here

Is this caused by the printer?

  • In my opinion, since the picture contains colored part, the black color is being produced by mixing all 3 colors (CMY) instead of a pure black color (K). So, the black part can be not too black. – Sigur Jan 7 '20 at 22:25
  • Yeah but I also have some LED's all black without any other color nearby and they show up the same, with a line of darker black around a greyish area inside the LED. I cannot show them because the scanner's light is so powerfull that it appears black instead of gray. – ElSabio Jan 7 '20 at 22:29
  • You can look at the PDF with high magnification and see if the problem is the printer or not. Keep in mind that antialiasing algorithms can kick in and create intermediate colores on sharp, not horizontal or vertical lines --- that's normal and good. See geeksforgeeks.org/anti-aliased-line-xiaolin-wus-algorithm – Rmano Jan 8 '20 at 8:41
  • In the case you show, that could be the printer or even the scanner --- it is not possible to have perfect alignment between the several colors. – Rmano Jan 8 '20 at 8:42
  • Your updated picture and code doesn't correspond (for example, shorter and thicker arrow in the picture than the arrow produced by the code). – quark67 Jan 8 '20 at 17:46

It is the printer.

I did another try in a different copy centre and it is perfect now:

enter image description here

Thank you all for your comments.

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