#5 Set dpi --we really mean set the # of pixels per inch!

DPI --Really means pixels per inch


DPI has nothing to do with resolution. It has everything to do with printing and displaying your image on a monitor.
Printing
A setting of 300 DPI (ppi)tells your printer to print a dot (a pixel) 1/300 of an inch in size, or 300 Dots (Pixels) Per Inch.
A 96 DPI (ppi) setting tells your monitor to display a pixel 'element' at 1/96 of an inch or 96 pixels elements per inch on the screen.

Resolution is the size of the pixel when it is printed or displayed (Pixels per inch -ppi)...
Resolution is also the number of pixels in a photo...
Note:
Most consumer digital cameras set the photos dpi (ppi) to 72. The dpi (ppi) setting tells the camera's processor to display 72 pixels per inch on the camera's display LCD.

An modern LCD/LED computer monitor for a PC or a Mac generally displays at 96 pixels per inch.

You can calculate your monitors actual display resolution by measuring the width and height (in inches or cm) and dividing that into the # of pixels in the display's width and height eg
My 20" Dell displays at 1680 x 1050 pixels and measures 17.125 inches wide and 10.75 inches tall
1680 pixels ÷ 17.125 inches = 98 pixels/inch
1050 pixels ÷ 10.75 inches = 97.7 pixels/inch

Set the printing DPI for your picture
for printing by using the menu item
 Image > Image Size...
Setting printing resolution
You should always check to see that every picture you print has been set to the correct number of pixels per inch
(200 - 300 ppi) it doesn't have to be 300 ppi...
Absolute Rule:  Always sharpen a photo before you send it to a printer!

How large can I make a "perfect" print?


Divide the width of a picture in pixels by the # of pixels per inch (DPI) --the value you told the printer to print per inch

EG from the data on the left...

Width:
2845 pixels / 300 pixels per inch
 = 9.48 inches

Height:
2152 Pixels / 300
Pixels per inch
=7.1733 inches

Up Rezing a photo for large Prints

Some times you have a low resolution photo that you need to upscale to make a large print. Photoshops function Bi-Cubic smooth is okay but these are way better

SiPro V2.5 at Fredmiranda.com
Genuine Fractals, now known as Perfect Resize at onOne Software.com (A Portland Company)
Blow Up By Alien Skin at alienskin.com/

Okay, thats all for now.