![Image](https://i.stack.imgur.com/dIsul.png)
convert -noise 20x20 resultnn.png output.jpg
convert output.jpg +dither -posterize 2 mono12.png
how i could do this better
this is my output
![Image](https://i.stack.imgur.com/GMABm.png)
i expected something like this
![Image](https://i.stack.imgur.com/vDc6y.png)
enter image description here
what I could do
doing a crop i obtain this
convert mono12.png -fuzz 10% -fill blue +opaque "#000000" monod12.png
corde=$(convert monod12.png -median 3x3 -format %@ info:)
convert resultnn.png -crop $corde +repage resulnmonod12.png
![Image](https://i.stack.imgur.com/4IFe5.png)
this is my expected output
![Image](https://i.stack.imgur.com/iCTxw.png)
i need detect the circle ; I would use a command to detect it by color; But as it is a transparent watermark this is impossible
Please help me