You’ll need to change the picture into something without soft transitions. Manual work in Illustrator comes to my mind for perfection, or Photoshop with reduced number of colors for a quick and dirty version.
DaVinci Resolve is very capable even for free, but you need the right hardware!
Studio 18.6.3, MacOS 12.7.1 MacBook M1 Pro, 16 GPU cores, 32 GB RAM and iPhone 15 Pro Speed Editor, UltraStudio Monitor 3G, iMac 2017