You can select an image from your computer or get one from an URL. Afterwards you can press zoom to add details, and smooth to remove noise.
There are two renderers. The pixel renderer which is faster for large pictures, and the square renderer which creates a square for each pixel. The square renderer is really slow when used with large pictures. That is why when the renderer is set to auto it chooses the renderer based on the size of the picture.
From file:
From URL:
Show resolution:
  • Auto
  • Square - Distance between squares:
  • Pixel