Preparing Images for Printing
FIRST- convert the color space to Adobe 1998

Now RESIZE your image up to the print size:
Images on a screen are 72 DPI - Images for print should be between 180 and 300 DPI.
Best print resolution is 300 DPI.
Resizing up is only if your image size is smaller than the intended print size.
Resizing to make an image smaller is useful for web applications and email.

DPI is an abbreviation meaning Dots Per Inch.
It is used as a form of resolution measurement for printers, scanners, digital cameras and displays.
Digital images are made up of Pixels.

Short for Picture Element, a pixel is a single point in a graphic image.
Graphics monitors display pictures by dividing the display screen into thousands (or millions) of pixels, arranged in rows and columns.
The pixels are so close together that they appear connected.
On color monitors, each pixel is actually composed of three dots -- a red, a blue, and a green one.

Printed images are made up of dots of ink - either a color dye or particles of pigment. Measured by Dots per inch DPI.

If you are printing to a specific size (like 8.5X11) crop to the final proportions:

First find the native resolution of your image:

Uncheck Resample image and change resolution to 300 pixels/inch.

This now shows the actual size of your printed image

Now check the Resample image box and increase the image size by %110

The image is resized by adding extra pixels between existing pixels.
Changing in increments of %110 at a time makes a smoother/sharper image

Keep increasing the image by %110 until you reach your final size.

Rename your file to reflect the resize dimension - filename 8-5X11.jpg

You are now ready to print.