It will be appropriate to increase the the resolution of the image in photo shop for publishing in print media. To print it will be good if the image is around 3 Mpx. For web applications the resolution of the image has to be less .
It is appropriate to decrease the resolution of an image in photo shop when the size of the image is too large to send it by e-mail or to publish it in the Internet.
Yes we can decrease or increase the resolution of an image by using variation effects in photo shop. Lot of adjustments are available in photo shop menu. Photo shop is the best place to edit pictures.
enter in photoshop for change resolution of image! is simple to use need to have min 3 hours use that program and you know how can modify resolution!! yes is simple