The best file format to store a 400-megapixel image would be a lossless format that can preserve all of the detail in the image. The two most common lossless formats are TIFF and PNG.

* **TIFF** (Tagged Image File Format) is a versatile format that is supported by most photo editing software. It is also a good choice for printing images, as it can produce high-quality output. However, TIFF files can be quite large, so they may not be ideal for sharing images online.
* **PNG** (Portable Network Graphics) is another lossless format that is smaller than TIFF files. PNG files are also supported by most photo editing software, and they can be used to create transparent images. However, PNG files may not be as suitable for printing images as TIFF files.

If you need to store a 400-megapixel image in a lossless format, then TIFF or PNG would be the best choices. However, if you need to share the image online or print it, then you may want to consider using a lossy format such as JPEG.

Here is a table summarizing the pros and cons of each format:

| File Format | Pros | Cons |
|---|---|---|
| TIFF | * Lossless compression | * Large file sizes | * Supported by most photo editing software | * Suitable for printing images |
| PNG | * Lossless compression | * Smaller file sizes than TIFF | * Supported by most photo editing software | * Can create transparent images |
| JPEG | * Lossy compression | * Smaller file sizes than TIFF or PNG | * Widely supported by browsers and other applications | * Not suitable for printing images |

Ultimately, the best file format for you will depend on your specific needs. If you need to preserve all of the detail in the image, then a lossless format such as TIFF or PNG is the best choice. However, if you need to share the image online or print it, then you may want to consider using a lossy format such as JPEG.
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