Today, the most popular formats for embedding images in emails are JPEG, GIF, and PNG. None of them have definite advantages, so you should be guided by the task you set for the picture when choosing.
- JPEG. This format does a great job of rendering the colors in your photos. But it can not use animation; with its reduction, it gets very distorted, and it is not convenient for logos.
- GIF. This format transmits animated images, compresses without losing quality, transmits text well, and allows you to create transparent areas. But the palette is limited (256 colors), GIF files are large, and it displays photos poorly.
- PNG. The format is compressed without losing quality and is ideal for logos and icons; it conveys texts and transparency. However, not all browsers support PNG animations, and it doesn't work well in emails...