How to increase thickness of pen/pencil drawing?

I have a notes/drawing drawn with light and thin color pencil. How do I increase the thickness of the color pen or pencil handwriting or the drawing and make it heavy weight and bold? How do I make my handwriting look more like a picture? What do I do if I want to change the shape of my handwriting? For example, I have this picture,
Parsec
Image source: https://commons.wikimedia.org/wiki/File:Parsec.jpg

Answer

You can do it in GIMP (which is free and open source)

Open the image and do Filters > Distorts > Value Propagate. Set the mode to “More black (smaller value)”, then set the slider values as shown below. Adjust the thickness as desired by moving the propagating rate slider. You can also increase the Lower Threshold slider if the result is a bit blurry.

Here’s the split view so you can see before and after

enter image description here

Note: If you feel this has gone a little too dark, it’s also possible to use Colors > Curves to lighten it back up again, just a touch.

enter image description here

Attribution
Source : Link , Question Author : huzaifa abedeen , Answer Author : Billy Kerr

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