Troubleshooting Common JPG Issues

Common JPG Problems & Instant Fixes

1. Compression Ringing & "Mosquito Noise" Around Text

• Symptom: Blurry halo or speckled pixel noise around letters, logos, or high-contrast lines.
• Cause: The 8x8 Discrete Cosine Transform struggles with sharp geometric step edges.
• Fix: Use PNG for text-heavy graphics and logos. If using JPG, set quality to at least 88%–92%.

2. Transparent Background Turns Pitch Black

• Symptom: Converting a transparent PNG to JPG fills transparent areas with black.
• Cause: JPG does not support alpha channels. Naive converters interpret transparent $RGBA(0,0,0,0)$ as solid black.
• Fix: Use ILoveJPG’s PNG to JPG tool, which automatically blends transparency onto a clean white canvas.

3. Colors Look Washed Out or Dull in Browsers

• Symptom: Vibrant photos look faded or greyish when viewed on websites.
• Cause: Image was saved with Adobe RGB or ProPhoto RGB color profiles instead of sRGB.
• Fix: Convert your color space profile to standard sRGB (IEC61966-2.1) before publishing to the web.

4. Image Appears Rotated Sideways or Upside Down

• Symptom: Photo taken on iPhone or Android opens in incorrect orientation.
• Cause: The browser or software failed to parse the EXIF orientation flag.
• Fix: Open the image in Image Editor or Resize JPG to bake the rotation permanently into the pixel data.

5. File Size Is Still Too Large After Compression

• Symptom: Compressing with quality slider still doesn't get file under 100KB or 50KB.
• Cause: Raw pixel dimensions are too high (e.g., 4000x3000px).
• Fix: First use Resize JPG to scale dimensions down to 1200px or 800px width, then compress.