Image Compression Tool Guide
Image Compression Principles
Image compression reduces file size through several methods:
- Lossy Compression: Reduces file size by removing image details that are less noticeable to human eyes, as used in JPEG format.
- Lossless Compression: Reduces file size by optimizing data storage without quality loss, as used in PNG format.
- Dimension Reduction: Reduces file size by decreasing the number of pixels.
- Metadata Removal: Removes extra information from images, such as EXIF data.
Compression Modes
- Size Priority: Suitable for scenarios requiring significant file size reduction
- Compression quality set to 60%
- Automatically limits maximum dimension to 1920 pixels
- Ideal for website images, email attachments, etc.
- Quality Priority: Suitable for scenarios requiring high image quality
- Compression quality set to 90%
- Maintains original dimensions
- Ideal for photography work, print images, etc.
- Custom: Customize compression parameters based on specific needs
- Adjustable compression quality (0-100%)
- Configurable maximum file size limit
- Suitable for scenarios with specific requirements
Supported Image Formats
- JPEG/JPG: Suitable for photos and complex images, supports high compression rates
- PNG: Ideal for icons, screenshots, and images requiring sharp edges
- BMP: Common uncompressed bitmap format
- GIF: Image format supporting simple animations (Note: animations will be lost after compression)
Usage Recommendations
- Choose appropriate compression mode based on usage scenario:
- Use "Size Priority" for website images
- Use "Quality Priority" for important images
- Use "Custom" for special requirements
- Backup original images before compression
- Check if compressed image quality meets requirements
- For large images, adjust dimensions before compression
