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File type

Select the right file type depending on the image. The general rule of thumb is:

- PNG or SVG for vector-based images such as icons and logos
- JPG for such as photography-sourced images

Colour mode

Ensure images are saved in RBG mode.

Colours will look different depending on mode. RGB (best for screen), CMYK (best for print) Here is an article explaining the difference.

Compression

Compress image files.

- Compression reduces storage and load times but will affect quality. Photo editing software includes compression tools you can use to optimise compression while maintaining the quality needed. Here is an article explaining compression.

Dimensions and resolution

Accommodate the device type(s) of your users when deciding dimension and resolution.

- If an image is to appear on mobile, tablet and desktop devices, consider separate scalability and/or resolution of images for each type. In general,
  - Dimensions: remember that desktop is wider and mobile is taller, with tablet in between.

- - Resolution: Export images at higher resolutions for mobile devices, and lower, for desktops/tablets.

Tip

title	Specifying device type

Use the device type display options when adding banners on your website. You can also deselect a device type so a banner does not display on it.

File size

Minimise file size

- Recommended maximum file sizes: 250kb for desktop and tablet, 50kb for mobile.

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