Go beyond basic sliders. Learn about chroma subsampling, quantization tables, and advanced compression mechanics that professional developers use to tune media files.
Chroma Subsampling (4:2:0 vs 4:4:4)
The human eye is much more sensitive to changes in brightness (luminance) than changes in color (chrominance). Chroma subsampling exploits this by saving color information at a lower resolution than brightness details. For standard web use, 4:2:0 subsampling cuts file sizes down significantly with zero perceived quality loss.