PhilosophersPictures.com: Resolution Guide

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MegaPixel Size	Image Resolution	Outstanding Print (* fine compression)	Very Good Print	Fair Print
1	480 x 640	Wallets, 4x6, 5x7	8x10	11x14, 16x20, 18x24, 20x30
1.2	768 x 1024	Wallets, 4x6, 5x7, 8x10, 8x12	11x14	16x20, 18x24, 20x30
1.5	1024 x 1280	Wallets, 4x6, 5x7, 8x10, 8x12, 11x14	16x20	18x24, 20x30
2	1200 x 1600	Wallets, 4x6, 5x7, 8 x10 8x12, 11x14	16x20, 18x24, 20x30	none
2.5	1368 x 1712	Wallets, 4x6, 5x7, 8 x10, 8x12, 11x14	16x20, 18x24, 20x30	none
3	1536 x 2048	Wallets, 4x6, 5x7, 8 x10, 8 x12, 11x14, 16x20	18x24, 20x30	none
4	1800 x 2400	Wallets, 4x6, 5x7, 8 x10, 8x12, 11x14, 16x20, 18x24, 20x30	none	none
6	2016 x 3040	Wallets, 4x6, 5x7, 8 x10, 8 x12, 11x14, 16x20, 18x24, 20x30	none	none
* All files, sizes and print quality were determined by their camera's highest resolution setting using the standard 7:1 JPEG ratio

Printed Image Resolution Guide