Inspired by this, I'm using Graphics
to generate such a image, but it return
I want every disk to be the same color. How to modify to make it work? Using image related functions is OK, DiskMatrix
etc.
Graphics[Table[{{Opacity[0.5],White,Disk[{0,0},11.25]},
{RGBColor[{136,28,255}/255],Disk[{x,y},0.25]}},{x,-15,15},{y,-15,15}],
Background->Yellow, PlotRangePadding->None]