well ekta, well, The generally accepted number is 300. Printing an image at a resolution of 300 pixels per inch gives you enough image information for professional quality prints. In fact, 300 is usually a bit more than you need. You can often times get by with 240 pixels per inch for resolution without noticing any loss of image quality. The professional standard though is 300 pixels per inch.
Based on our simple math, we can see that in order to print a digital photo as a 4x6 at 240 pixels per inch resolution, which should give us good quality, our photo's pixel dimensions need to be 960x1440. We can see exactly how many pixels that is by multiplying 960 by 1440, which gives us 1,382,400 pixels. Let's round that up to 1.4 million pixels. That may sound like a lot of pixels but it really isn't, not when you consider that 1.4 million is the minimum number of pixels you'd need to print good quality 4x6 photos using the minimum resolution we can to achieve good quality, which is 240 pixels per inch. The good news at least is that these days, most digital cameras on the market are 4MP ("mega pixels", or "millions of pixels") cameras and higher, so they'd have no trouble printing good quality 4x6's even using 300 pixels per inch for the resolution.
For more visit :
http://www.photoshopessen tials.com/essentials/image-qua lity.php
Answered by
Romi
, an ibibo Master,
at
10:46 AM on June 26, 2008