paulnicholson wrote:I know that posting an image any larger than 400Kb would be too large on most websites, especially my own - it slows the loading speed of the web page.
It depends what the image is for. If you have an image gallery, then users will expect larger downloads. For a normal webpage, any image over 50kb it too big IMO.
Probably the best you can do to keep your images as small as possible is to save in the right format. For photographs and complex images, JPEG is best. For simple images and graphics, PNG is best. I always use PNGOUT (which can be used as an IrfanView
plugin) to make my images as small as possible - I've tried other programs like PNGCrush and they hardly compare. For JPEGs, most programs allow you to reduce the quality of the image to reduce the filesize. I always experiment with to see what setting works best for the image without losing too much quality, but at the same time reducing the size.
Never use formats like BMP and TIFF because they aren't supported by all operating systems. Generally I don't use GIF either, since it only supports 256 colours.