Pixels()

The pixels of the stage or of an image file, to read colours from. Coordinates count pixels from the top left corner (0, 0).

Pixels terrain = Pixels.of("assets/terrain.png");
boolean solid = terrain.getColor(10, 20).getAlpha() > 0;
 
Pixels screen = Pixels.of(this.getStage());

The stage's pixels are what its world layers show at that moment: backdrop, stage colour, pen strokes, stamps and sprites with their effects, the same as colour sensing sees. Texts, shaders and the UI layer are not included.