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jpg compression artifact

JPEG compression artifacts are visual distortions that occur when an image is compressed using the JPEG format, which is lossy compression method. These artifacts become more pronounced at lower quality settings or with repeated saving.
What Are JPEG Compression Artifacts?
• Blockiness: JPEG divides images into 8×8 pixel squares, and heavy compression can cause visible edges or “blocks” between these squares, especially in areas with smooth gradients (e.g., skies).
• Color Banding: Subtle color transitions may appear as distinct bands due to reduced color information.
• Blurring: Fine details can be lost, making edges or textures appear soft or smeared.
• Noise or Halos: Around high-contrast edges, you might see ringing or halo-like effects.–Mr. Grok