I use a template variable for my image alt in code such as following:
<img src="smiley.gif" alt="[*pagetitle*]" height="42" width="42">
My home-page is heavily loaded with images and somehow around 50% of my images do NOT have alt img text, but the others do. Different SEO tools tell me that. I wonder why? And perhaps there is a better way to generate img alt text? Whats an optimal solution?
Now I use a TV as in above example and the input-type is just "text". Nothing fancy.