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The little popup "browse" screen will sometimes freeze when uploading pictures. I don't know what's wrong with these pictures, as they're all in the jpg format and are under the 5 MB limit. (they're actually around 1.2 MB) Any ideas?
I've personally found that the Image Uploader tends to freeze when dealing with larger files (especially at busy times of the day). Although your file is well under the 5MB 'limit', 1.2MB is still a pretty hefty jpeg for any website to handle. Remember that anyone visiting your website will need to wait for all the related files to load - if you have a number of large images on a page, this may take a while. I suggest that you optimise your files well to ensure that visitors don't leave your site in frustration at the delay (as a rough guide, a 640 x 480 image should be less than 100K).
In the section 'Understanding Images' in 'Creating Good Looking Websites' I explain why Smaller is Better.
"Minimise the use of images on a single page. As a rough guide, ten to twenty 20k images on a page is more than plenty. Be sure to optimise your images for the web. All image files should be low resolution (72dpi). As a rule of thumb use GIF format for computer generated graphics such as simple logos, buttons or animations, and JPEG format for photographs or scanned material."
In these two tutorials I discuss the importance of DPI, file formats and Image Optimization and take you through the steps to optimise your graphics in Photoshop and Picnik.
I hope this gives you some insights into the exciting world of web design. Good luck!!