Problems:
1. Not good at density control. From this view, the growing mask seems more promising.
Scaling errors
Stippling
Halftoning
============================
(Half number of dots are used)
Halftoning
============================(Half number of dots are used)
Stippling
Halftoning
=========================================
Halftoning
=========================================Stippling
Halftoning
==============================================
Halftoning
==============================================
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