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Suggestions on how to separate small pixels clusters

Explorer ,
Nov 30, 2022 Nov 30, 2022

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Hello,

 

I'm wondering if anyone has any suggestions to achive the below.

 

(imaging the sample below over a larger area) I'm trying to figure out a method of just selecting the red areas which are above a certain pixel count in area. In effect, I want to select the small red dot areas and fill them in green.

I've played around with contracting and expanding etc, however, after contracting by 2 for example, I might have to expand by 6/7 pixels to get the all the pixels in a larger shape which have an accute angle (if that makes sense), then it's likely some of those small pixel areas will be picked back up again.

bobd7221748_0-1669809061075.png

I've tried solving this problem a number of times, but can never figure it out. I'd be really interested to see if anyone has any angles on how to approach this which I haven't yet considered. Even a seed of an idea might help me figure it out for myself.

 

Thanks in advance!

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Community Expert ,
Nov 30, 2022 Nov 30, 2022

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How exact does it need to be? 

 

Dust & Scratches might work to some extent. 

Screenshot 2022-11-30 at 13.07.09.pngScreenshot 2022-11-30 at 13.07.34.pngScreenshot 2022-11-30 at 13.07.41.png

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Explorer ,
Dec 02, 2022 Dec 02, 2022

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Thank you for the suggestion! I've played around with dust and scratches before, but ideally, I am, looking for an exact result really. Though I am interested to re-create your experiement to see if you've tackled it differently to how I would have done. Thank you very much for your input!

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Community Expert ,
Dec 08, 2022 Dec 08, 2022

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If I remember correctly a while back someone actually created and posted a plugin for this sort of thing because Scripting approaches were so slow. 

Unsurprisingly I cannot find it anymore (though I am not sure it would work on a current version of Photoshop, anyway). 

 

Can you post an actual sample-file? 

Or at least tell what the images’ pixel dimensions are? 

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