Renaming tiff to jpg
On Macs, does that actually convert the file? Perhaps your image viewer software recognises the 'jpeg' file as a tiff. You can tell because the filesize for jpegs is usually smaller. If it's the same size, it means you've just renamed the file.

Load it into an image editor such as Photoshop and save it as whatever format you want. There are some lightweight image-viewers that do the trick.
( mistaspakkaman and the inedible shifting caterpillars, Mon 7 Jul 2008, 12:09, Reply)