testing with spoons
- Thread starter BarryG
- Start date
Your image manipulation tools should be able to tell you how many pixels an image will take up. Usually it will be a rectangular image so width x height is all you need. You can't know what sort of a screen it's going to be displayed on (might be my 1920 x 1280 monitor or my 320 x 200 smart'phone) so almost all you can do is hope that the viewer has an intelligent way of dealing with it. Most browsers can re-size an image reasonably well but you can make life easier for them by using modest image sizes (a few hundred pixels).
You need to keep the file size reasonable to avoid long load times, especially over slow links like telephone modems and especially if there are many images to be displayed at one time. For a page with just a few images I like to keep the file size down to about 100kBytes or less. Not so long ago the entire page, images and all, needed to be 20kBytes or less to avoid losing the audience through boredom! With a jpeg you can trade image quality for a reduced file size, you can't do that with all image file types.
