In response to @JackPD wishing to use various font weights for canvas labels, while not really possible it occured to me that because labels are transparent, using multiple canvases offers a variety of possibilities.
Here are some ideas
font-tricks.pd

Nice

@Balwyn said:

In response to @JackPD wishing to use various font weights for canvas labels, while not really possible it occured to me that because labels are transparent, using multiple canvases offers a variety of possibilities.
Here are some ideas
font-tricks.pd

Wow, that´s amazing, how do you found all these commands and attributes? Also, seeing that you are really advanced in this topic, is it possible to make a canvas with a color gradient or is it too much? I would like to apply a gradient background to the label if it´s possible.

Thanks for sharing this information, it really opens the possibilites on improving GUIs.

You cannot create a canvas with a gradient background.
You can however create a gradient with many canvases
font-tricks.pd
This was created with 60 canvases
You can find the command and attributes for all GUI objects by right clicking and selecting Help
then opening [pd edit]

you can also get quite decent effect with just 20 canvases

The fact that when dynamically creating canvases, the normal way of setting rgb colour doesn't seem to work (in Win10 at least).
This puzzled me, so I checked the dialog.iemgui.tcl and found the default color scheme by Mary Ann Benedetto were set with hex values in the format of
"#E3C6FF" .
So using that I've managed to set the canvas colour dynamically.
However it doesn't work with PurrData. So I'll adapt this for PurrData next.
gradient-creator.pd

Ok, so Purr Data and Pd-Extended both need a second loop to set the canvas colours after instantiation
gradient-creator-purr.pd