Preparing your images
punctuation and Apple Mac users must ensure the files have an extension of .jpg
The height can vary but the maximum width is 600 and a maximum height of 400 pixels.
Images should also be compressed to around 70-80% compression and if your software offers the alternative, in RGB mode rather than CMYK.
The maximum file size is 160kb. It should be possible to save 600x400 images that are good
enough for web viewing at around 80-100kb.
Using ‘Save for Web & Devices’ should achieve this.