Which of the following is NOT a common file format for images?

The choice of .mp3 represents a file format that is primarily associated with audio. This format is widely used for compressing and storing music and other audio data, making it unsuitable in the context of image file formats.

In contrast, .jpg, .gif, and .bmp are all established formats specifically designed for storing images. The .jpg format is widely used for photographs due to its efficient compression methods that help reduce file sizes while maintaining quality, making it ideal for web use and digital photography. The .gif format supports animation and allows for transparency, making it a popular choice for simple graphics and animated content. Meanwhile, .bmp is a bitmap image format that provides high-quality images but generally results in larger file sizes, making it less common for use on the web but still significant in graphics applications.

Therefore, identifying .mp3 as the option that does not fit with the common file formats for images is accurate, as it pertains to a different category altogether—audio files.