Best Practices for JPG Image Quality

1. Optimal Quality Setting Sweet Spots

• Web Publishing & E-commerce (75% – 85%): The golden standard. Reduces raw file weight by 70%–85% while remaining visually indistinguishable from uncompressed photos on 4K and Retina screens.
• Print & High-End Portfolio (90% – 95%): Delivers pristine color fidelity for 300 DPI physical prints without unnecessary file bloat (quality settings above 95% inflate file size exponentially with zero human-visible benefit).
• Thumbnails & Grid Previews (55% – 65%): Maximum byte savings for rapid mobile list rendering.

2. Prevent Generation Loss (Re-compression Degradation)

Every time you open, modify, and re-save a JPG, the lossy DCT quantization algorithm runs again, compounding compression artifacts and introducing color banding.

• Best Practice: Always store your original master files in lossless format (RAW, PNG, or TIFF). Only export to JPG as the final distribution step.

3. Always Embed the sRGB Color Profile for Web

Browsers and mobile screens interpret colors through the standard sRGB color space. If you export JPGs in Adobe RGB or ProPhoto RGB without converting to sRGB, your images will appear washed out, dull, and desaturated on websites.

4. Resize Pixel Dimensions Before Compressing

Compression reduces byte weight by quantizing pixel details; resizing reduces raw pixel count ($Width \times Height$). Resizing a 6000x4000 camera photo to 1920x1280 cuts raw data by 89% before compression even starts!