Final answer:
For commercial printing, the standard resolution is 300 ppi, which offers sufficient clarity for most printed materials, while 8 MP is generally enough for clear and sharp digital photography unless printing posters.
Step-by-step explanation:
The standard ppi (pixels per inch) resolution for a digital image intended for commercial printing is 300 ppi. When preparing images for professional print purposes, a higher resolution is necessary to ensure that the final printed product is clear and sharp. This is because the printed images need enough detail to prevent pixelation when viewed at close distances. For most printing applications, such as brochures, magazines, and books, a resolution of 300 ppi is industry standard. While photos with 8 MP can produce high-quality prints, if the photos are intended for large posters, higher MP might be needed.