Here is a good site that comprehensively takes you through the process of resizing images for the internet using Photoshop:

Media College.com

HOWEVER …..

A really easy way to prepare files for the internet is to use dosize.com

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DoSize is a Web 2.0 application that will convert your files in 3 easy steps and then email the web images to your email account! All you need to do is follow the three steps:

1. Upload your file: select your files and hit ‘do upload’

2. Select the size for resizing: either 640 x480 at 72 dpi (internet resolution) or 4×6in or 5×7in or 8×10in (print resolution)

3. Input your email address and hit send!

The website is easy as pie to follow so have a go!

Most digital cameras have a setting that lets you capture web-ready images: its usually the smallest file size (resolution) called Basic, Web or Email or even 640×480. Check your manual!

What is the FUNCTION of a website?

What DESIGN features (visual, technical etc) make or break a website’s success?

“If you ask why something works and you push back far enough, eventually everything seems to be based on contrast: the ability to distinguish one thing from another. Composition, sequencing, even legibility all rely on devices that affect the contrast between things”.
— Chris Pulman, The Education of a Graphic Designer

Web design tips

Principles of Graphic Design explained simply

Alignment

What features hold a viewer’s ATTENTION?

Grids

Page Design

What is the biggest turn-off?

How to design fast websites

How can I make a website interesting and CAPTIVATING FOR THE VIEWER?

Gestalt principles

Fonts, images and white space

How can you avoid the pitfalls of designing a bad site? Go to:

Web Design Mistakes Sorted

Top 30 Mistakes