JPG Format Introduction
JPGは最も広く使用されている画像フォーマットで、優れた互換性と圧縮を提供します
History
JPG (JPEG) format was created in 1992 by the Joint Photographic Experts Group as one of the first image compression standards. It uses lossy compression algorithms to significantly reduce file sizes while maintaining acceptable image quality, becoming the standard format for digital photography and web images.
Technical Features
JPG uses Discrete Cosine Transform (DCT) for compression, supports 24-bit true color, and adjustable compression quality (1-100). File sizes are typically 5-10 times smaller than lossless formats, suitable for storing photos and complex images. Does not support transparency, and each edit loses quality.
Use Cases
JPG is widely used for digital camera photos, web images, email attachments, and social media sharing. It's the preferred format for storing and sharing photos, especially suitable for complex images containing millions of colors.
Advantages
- Small file size, easy to store and transfer
- Wide support, compatible with all devices and software
- Suitable for photos and complex images
- Adjustable compression quality
- Ideal for web display
Disadvantages
- Lossy compression, quality degrades with multiple edits
- Does not support transparent backgrounds
- Not suitable for line art and text
- Compression artifacts visible