The only real size limitation is the file size. The image itself can be as large as you'd like, as long as the file size of smaller than 256 Kilobytes. If you are posting a photograph, you can reduce the size by saving it in the JPEG format, with a quality of 80 - 90%. This will provide a decent quality at a low file size. If you are posting a computer drawing, saving the image in the PNG format will secure the smallest possible file size with no loss in quality.
If you don't have any image editing software installed, you can open the image in Paint (Start > Programs > Accessories > Paint), select JPEG or PNG according to the instructions above, and save it to a new location. If the image is still too large to be attached, try downscaling the image ([Ctrl] + [W] in Paint).
- Click on the Upload attachment tab.
- Click Browse and select the file you wish to upload.
- Add a description of the file (optional)
- Click Add the file