Draw a selection around the larger black area

Question

How to identify the largest black area in an image? Create a selection around the largest black area, as shown in the image: There are many black areas in the image, each varying in size and position. The goal is to identify the largest black area and create a selection around it. I'm confused and don't know how to achieve this. Thank you, everyone.

Stephen Marsh · Accepted Answer

Some links that may help:

https://community.adobe.com/t5/photoshop-ecosystem-discussions/how-do-i-seperate-subjects-into-different-seperate-files-automatically/td-p/14449644

https://community.adobe.com/t5/photoshop-ecosystem-discussions/isolating-groups-of-pixels/td-p/4042904

https://community.adobe.com/t5/photoshop-ecosystem-discussions/options-besides-crop-and-straighten-for-separating-images/m-p/12964068

Stephen Marsh · Answer

@w30290083o9nn

For scripted automation, I believe that you would need to isolate each area to a separate layer or channel, then each individual area can be inspected via bounds or pixel count to determine which is the largest, then a selection can be loaded and expanded.

EDIT: Perhaps loading a selection for all areas and converting to an individual path for each would be another approach. Perhaps each path can then be determined as to which is larger.

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