I uploaded a tif image into SharePoint Designer but it will not display on the web page. Does it have to be jpeg? I have uploaded jpeg images and they work fine but I erased a background on an image and saved it as a tif. Thanks
It might work for some browsers and not for others, but it's also possible that Sharepoint is rejecting it outright. I'd recommend sticking to any of the standard web formats: JPEG, GIF, and sometimes PNG.
TIFFs are uncompressed, so they're really large and as such not very web-friendly. They're handy as a backup format though, should you ever need to make changes to the site later.