What is the minimum standard for print resolution?

You're always going to get pixilation and blurring if you print at a resolution lower than your images.  At some point, however, no one will be able to tell10 years ago everyone printed at300 DPI and no one seemed to object.  However, if take a600 DPI printer and print a copy at300 and a copy at600 DPI, the difference is amazing.  So, I would say the minimum resolution that people would accept now is300 DPIAnother thing you should check is what the resolution of the images you're trying to print is.  If you're printing from the web, it's typically only72 DPI.  PDFs can range, but are often either72 DPI or300 DPI.  If you print higher than the resolution of your images, they won't look any better but the text should look better

There are two options available usually

300dpi

600dpi

so300 is minimum

Quick breakdown:

• Screen Resolution72/96 dpi - pixelated when printed at100%
• Large Format Printng:120 -250 dpi (usually viewed from a distance so pixelation is not apparent)
• Digital Printing:300 dpi (recommended) printing at higher resolutions 'smooths' artwork and gradients but doesn't affect the image unless you scale it up
• Offset Printing:300 dpi - anything less becomes more pixelated the lower the dpi

I hope that helps.

300 dpi indoor ,72/92 outdoor .

Resolution72 Pixel /Inch is the default one but with better resolution better go with300

You have to keep in mind the purpose of the final document. In the printing world, there is something called "Lines Per Inch" (LPI)A line consists of halftone points (aka physical dots used by the printer)In the printing world, the appropriate  LPI to be used is measured by the distance the print is meant to be viewd at.The Chart is as follows. 

Distance Present Study20 feet   greater than10LPI

18 feet  18.75 LPI or greater

16 feet  18.75 LPI or greater

14 feet  37.5 LPI or greater

12 feet  37.5 LPI or greater

10 feet  50 LPI or greater

8 feet    65 LPI or greater

6 feet    85 LPI or greater

4 feet    100 LPI or greater

2 feet    133 LPI or greater

1 foot    150 LPI or greater

6 in        150 LPI or greater

Multply the LPI into2 to get the appropriate DPI for your document. (: 

I always recommend240 to300dpi if any publications are to be printed at A4+ of course this all depends on the amount of information the printer can handle but realisticially300dpi will get you most of what you're after. Generally I keep all my work at300dpi in case my clients expect a larger version on print at a specialist printer.

The minimum resolution to print is300 dpi

300dpi

100 pixle

All of the answers are correct, especially100%on the review before print using any printer to get good quality. 

Other answers gives an idea of suitable reselution depending on the aimed printout. If you are designing for huge print, my recomendation is do design on ratio mesures for the actual one with resolution of300 dpi,600 dpi,1200 dpi. For example,7cm X10 cm with any resolution for print of7m X10m. As some suggested before me300 dpi is the common one. I hope this help.