How to set a brush in Photoshop that have a slightly degree of opacity over itself without lifting the pen, or reaching the same effect in a single path? what I need is to simulate a ballpoint pen stroke.
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I believe it's not possible at all in Photoshop, mainly because your brush stroke is, in fact, made of separate brush shapes (most often circles) that overlap to form a continuous line. You can see it by tampering with either the Flow or the Spacing setting (the latter can be found in Window > Brush).
What you can do, although it is a bit of a workaround, is this:
This solution does work, but the drawback is that if you want to have multiple overlapping points, you have to create multiple curves, and all that work can be extremely tedious. Alas, this is the closest I could come to the effect you asked about.
Hope this helps anyway!
Just using the brush tool should achieve what you're after. Setting the brush tool to a standard hard mechanical brush with an opacity like so:
Now draw continuously. I did this with a mouse:
If you're using a pen with pressure sensitivity, just make sure it's not affecting opacity. If you're after something that's path-based, you may be better off using Illustrator or other vector software.