How to remove/detect lone pixels?

Question

I'm trying to find pixels which are next to others, and removing pixels with no neighbours seems to be the best solution. Is it possible to either delete lone pixels/highlight continuous runs of pixels using some function?

c.pfaffenbichler · Accepted Answer

This might work:

• duplicate the Layer thrice,

• move one copy 1 px to the right,

• aother 1 px down,

• convert the three Layers to a Smart Object,

• Layer > Smart Objects > Stack Mode > Median,

• Filter > Other > Minimum aith 1px and Roundness,

• set the Smart Object’s Blend Mode to Screen.

r-bin · Answer

If you have black(gray\color) pixels and absolute white backgound then you can do this.

Make two copies of the original layer.

Apply to one of the copies Custom Filter

0 0 0 0 0
0 1 1 1 0
0 1 0 1 0
0 1 1 1 0

0 0 0 0 0
scale: 8 offset: 0

Using magic wand with

tol = 0, antial = off, cont = off

select white (255,255,255) on this layer.
If it's hard to find white, find a single pixel on the original, it will definitely turn white.

Turn off \ delete this layer. Switch to another copy. Fill the selection with white.

You can check the result by putting the layer to Difference blend mode or turning layer on\off.

Pixels at the very edges are not deleted. It is necessary to expand the canvas by 1 pixel at least with white filling.

UPD. To increase accuracy, you can replace in filter 1 with 256, and in scale 8 with 2048.

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