using the reference image change all light grey tiles to a darker grey that precisely matches the grey tone used in the key border pattern sample the darker grey directly from the existing key border to ensure perfect color continuity maintain original tile geometry grout spacing surface wear texture and lighting apply the darker grey uniformly across every light grey tile while preserving natural aging micro pitting and environmental grime so the modification blends seamlessly with the rest of the mosaic no other colors or pattern elements should be altered goal a seamless global color correction where every light grey tile is recolored to the darker grey found in the key border with full preservation of realism texture and historical surface character
