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Digital Resolution

This is an introduction to digital resolution [Pixels]. Discover the only 3 numbers you'll ever need to remember...
by

Karl Sedgwick

on 10 October 2016

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Transcript of Digital Resolution

Resolution
Size really does matter...
OBJECTIVES
What is a pixel?
Using the correct image size & resolution for imputing and outputting images.
The only three numbers you’ll ever need
Resolution is a word that is being thrown about and used in many ways while discussing monitors, printers and digital cameras. Thus, there is a lot of confusion about resolution. Most references to resolution are in the form of dots per inch or pixels per inch.
We are going to concentrate on ‘Pixels Per Inch’…
The word PIXEL [pick-sell] comes from two
words: Picture = PIX and Element = EL
A pixel is the smallest part of a digital image.

It's a single coloured square.
How do we create pixels?
Scanner
Digital camera
Create an image on screen using specialist software, e.g. Adobe Photoshop
Digital images are always square
[there are a few minor exceptions]

They are constructed of pixels.
There is a horizontal number and a vertical number of pixels. When you multiply these two numbers, you get the pixel size of the image.
A million pixels is called a Megapixel.
For example, an image that is 2048 pixels wide and 1536 pixels high = 3,145,728 pixels, called a 3-megapixel image, a very common image size used with digital cameras.
So what resolution do I need?
There are a million theories on what the optimum resolution is.



Top Tip:


1. Before you do anything, KNOW YOUR OUTPUT
In other words are you going to use the image for:-
A) Screen
B) Print

2. Know you DIMENSIONS.
If you are creating an image to display on screen, what size will it be? Will it be full screen, half screen, etc
If you’re going to print the image, is going to be A4, A3, a 6” x 4” photograph etc.

Caution, the bigger the dimensions, the bigger the file size (memory).
So what size do I need?
The 3 resolution figures you’ll ever need to remember are:

72 ppi
200 ppi
300 ppi
72 ppi

This resolution is used for anything that is to be displayed on a monitor or screen.
For example:
On a website, a Power Point presentation, TV screen, anything that doesn’t require a quality printout.
200 ppi

This resolution is used for anything that is to be printed on your home printer or college printer (non commercial).
300 ppi

This resolution is used for anything that is to be printed at a commercial/professional printers.




In other words:
If you’re going to get a thousand posters printed, you’re not going to print them on your little Epson at home, you’ll need the services of a professional printer.
Full transcript