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What is the Difference?
When you compress an image, the software has to decide how to save space. It has two choices: Lossless or Lossy.
Lossless Compression
Lossless compression looks for redundant data (like a large area of solid blue sky) and writes a mathematical shortcut for it, without altering a single pixel. When uncompressed, the image is 100% identical to the original. The downside? It only reduces file size by 10-20%.
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Lossy Compression
Lossy compression actually deletes data. It removes colors and details that the human eye cannot perceive. This results in massive file size reductions (up to 95%).
When to Use Which?
- Use Lossless for: Medical imaging, architectural diagrams, pixel art, and transparent logos.
- Use Lossy for: Photographs, blog banners, ecommerce product shots, and social media posts.
ImageTight allows you to dial in your exact lossy percentage (we recommend 80-85% for the perfect balance of quality and speed).
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