What image content types compress most efficiently to under 200KB?
Photographs with smooth gradients — outdoor scenes, portraits, product shots on white backgrounds — compress most efficiently. A 3-megapixel smartphone photo (2000×1500 px) reaches 200KB at JPEG Q88–92 with no visible quality loss. Screenshots and infographics compress less efficiently because high-contrast edges (text on white, colored buttons, sharp icons) produce large JPEG quantization coefficients that cannot be zeroed without visible block artifacts. A screenshot of a dense webpage at 1920×1080 px may only reach 200KB at Q60–70, where text begins to show softness. For screenshots, crop to the relevant region first to reduce pixel count before compressing.