You're on Gerard Meier's website

Color Heatmaps

Generate a cosine distance heatmap based on CIELAB color space.

How to use:

  1. Select a picture from the drop down menu;
  2. Draw a polygon with your mouse: hold left mouse button down to draw, release when finished;
  3. Wait while it computes the similarity heatmap. Computation is asynchronous, so doesn’t freeze the browser;
  4. Win win win.

Some specifics:

The paintings are from WikiArt and the photos from VGG.