The storage size of a 400 megapixel image depends on the bit depth and the compression format of the image file. Bit depth is the number of bits used to represent the color of each pixel in an image. Compression format is the way the image data is encoded to reduce the file size.

An uncompressed 24-bit RGB image (8 bits per color channel) would have a file size of **1.15 GB** (400 megapixels x 24 bits/pixel / 8 bits/byte / 1000 bytes/kilobyte / 1000 kilobytes/megabyte / 1000 megabytes/gigabyte). However, most image files are compressed to reduce the file size and save storage space. For example, a JPEG file with 90% quality and 24-bit RGB color would have an estimated file size of **97.2 MB**. Other compression formats, such as PNG, GIF, TIFF, RAW, etc., would have different file sizes depending on the image quality and complexity.

To calculate the file size of an image, you can use this formula:

image file size = pixel count x bit depth / 8 bits/byte / compression ratio

where pixel count is the number of pixels in the image (width x height), bit depth is the number of bits per pixel, and compression ratio is the factor by which the file size is reduced by compression. For example, a JPEG file with 90% quality has a compression ratio of about 10:1.
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