How it works
Why does my photo look yellow?
Indoor tungsten and LED bulbs emit warm light that cameras struggle to neutralise. Dragging the Blue channel up (and Green slightly) kills the yellow cast instantly.
Blue shadows in outdoor shots?
Shade and overcast skies bounce blue skylight into shadows. Reduce Blue, lift Red slightly. The "Blue Shadows" preset handles this in one click.
Use the histogram
The live RGB histogram shows where each channel peaks. If red towers over blue and green, your photo is warm/yellow — balance by lifting blue.
100% private
Everything runs in your browser using the Canvas API. Your image never touches a server. Works offline once the page is loaded.