Some more thoughts on superimposing a half-tone pattern. Use gmic like above on selections (or erase the bits not required) however...
The original image below is a piece of graphic art. Possibly created originally using a vector program such as CorelDraw.
To overlay a half tone pattern, try the Krita, that uses enhanced MyPaint brushes and one of them is a halftone pattern.
You can get a sort of equivalence in Gimp by making a half-tone pattern and painting using the Clone tool (1) . Bottom of the Clone tool dialogue is an option to set the source to 'Image' or 'Pattern' use pattern (2). Then paint using the clone tool. The big difference between Krita and Gimp is the degree of control over the pattern size there is none in Gimp. You need an old script to size a pattern or a set of various sized patterns.
Gimp or Krita (or CorelDraw..) a graphics tablet is best to enable pressure-opacity. (3)
The original image below is a piece of graphic art. Possibly created originally using a vector program such as CorelDraw.
To overlay a half tone pattern, try the Krita, that uses enhanced MyPaint brushes and one of them is a halftone pattern.
You can get a sort of equivalence in Gimp by making a half-tone pattern and painting using the Clone tool (1) . Bottom of the Clone tool dialogue is an option to set the source to 'Image' or 'Pattern' use pattern (2). Then paint using the clone tool. The big difference between Krita and Gimp is the degree of control over the pattern size there is none in Gimp. You need an old script to size a pattern or a set of various sized patterns.
Gimp or Krita (or CorelDraw..) a graphics tablet is best to enable pressure-opacity. (3)