Store an image in disk

I have a 1x1 inch passport photo and I want to store it in a computer disk in a way I minimize the size but also been able to print it back to the real world.

What do you recom开发者_运维技巧mend me? Thanks in advance.

UPDATE: this question is about image resolution.

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If you have a database, consider storing the image in a BLOB column, that will allow you to relate it with other information.