You could roll your own macro that would do some of that:

\define imageit(image:"image.jpg")
<a href=$image$ target="new"><img src=$image$ width="25%" height="25%" 
/></a>
\end

e.g. 

<<imageit "TW-Images\chimps_77646868_3patrol.jpg">>

This produces a 1/4 size clickable "thumb" (no actual thumb is generated).

To actually generate a thumb would probably take a FF plugin.

The tiddlyclip plugin (http://tiddlyclip.tiddlyspot.com/) can capture 
screenshots of  web pages, BTW.


On Monday, November 10, 2014 10:57:50 AM UTC-8, steve wrote:
>
> Hi
>
> I am using TW5 to write documentation for a application and I would like 
> to embed screenshots in the text
> So far I am able to have a clickable link to the image (see below)
>
> [ext[App Screenshot|./externalFiles/image.tiff]]
>
> What I would really like to do is:
> * have the image displayed in the tiddler without having to click on a 
> link (good);
> * have a thumbnail of the image displayed; click on thumbnail to see the 
> full resolution image (better)
> * generate the thumbnail "on the fly" without having to a separate 
> thumbnail image; click on the thumbnail to see the full resolution image 
> (best)
>
> Steve Wharton
>

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