Thanks for the quick reply, and for the code.

Unfortunately, it's not working for me. Here's what I've done.

1. Download a fresh copy of Tiddlywiki
2. Create a tiddler called "Test".
3. Copy/paste your code into "Test" and save.

I end up with a broken image icon. When I right click and choose "open 
image in new tab", I get the link:

http://mysite.com/dir/images/%7B%7B!!title%7D%7D.jpg

It's still interpreting {{!!title}} literally.

 --Nathanael
On Wednesday, June 23, 2021 at 11:14:15 AM UTC+8 [email protected] wrote:

> I think this is what you're looking for? There may be a better way to do 
> it, but it seems to function based on my tests. Thanks to everyone over the 
> last two weeks that have helped me so much! I wouldn't have been able to 
> answer someone's question like this otherwise.
>
> \define linkcreation()
> [img[images/{{!!title}}.jpg]]
> \end
>
> <<linkcreation>>
>
> On Tuesday, June 22, 2021 at 10:45:51 PM UTC-4 [email protected] wrote:
>
>> Long time lurker, first time poster.
>>
>> I've a wiki with a couple of hundred tiddlers all of the same format, 
>> just different content, so I'm trying to develop a tiddler template.
>>
>> Each tiddler displays an image specific to that tiddler. I've a directory 
>> in which all the images are kept, each with the same name as the tiddler 
>> {{!!title}} field. E.g.:
>>
>> images/Tiddler1.jpg
>> images/Tiddler2.jpg
>> images/Tiddler3.jpg
>>
>> They idea is to then embed the tiddler title in the url, i.e.:
>>
>> [img[images/{{!!title}}.jpg]]
>>
>> But of course that just gets read literally. I've also tried using a 
>> variable with the same result:
>>
>> <$set name="image" value="images/{{!!title}}.jpg">
>> [image[<<image>>]]
>> </$set>
>>
>> How can I do this?
>>
>> --Nathanael
>>
>>

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