The best file format to store very large images depends on your purpose and needs.

If your objective is to print the image into posters, the best file format for printing large images is TIFF, which is a lossless and versatile format that preserves the original quality and resolution of the image. TIFF files are also suitable for scanning and printing in large quantities. However, TIFF files are also very large and heavy, which can make them difficult to store, share, or edit.

Another good option for printing large images is PDF, which is also a lossless and compatible format that can retain the quality and resolution of the image. PDF files are also smaller than TIFF files, which can make them easier to store, share, or edit. However, some printers may not support PDF files, or may require specific settings to print them correctly.

If you are not planning to print your large images, but rather display them on a screen or a website, you may want to consider other file formats that are more suitable for web or mobile use. Some of these formats are JPEG, PNG, GIF.

These are some of the best file formats to store very large images depending on your purpose and needs. I hope this helps you choose the best format for your large images.
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