You can improve performance by only fetching a subset of the screen with screenshot:

my $img = screenshot(left => 68, right => 69, top => 58, bottom => 59);

You're also writing the screenshot to a file, then reading the same image back in again, which is a waste.

In reply to Re^2: How to get pixel color from 3d application by tonyc
in thread How to get pixel color from 3d application by JuR

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