Color inversion transforms bright white PDF pages into deep OLED dark mode canvases. By converting background pixels to pure black (`#000000`) and inverting text to crisp white, readers experience significantly reduced eye fatigue during nighttime reading. On modern OLED and AMOLED mobile displays, displaying pure black pixels completely turns off individual display diodes, conserving significant battery power during extended study sessions. Favored by software developers, medical students, and researchers reviewing lengthy technical papers in low-light environments.