To create it, I first define my goals, intentions and desires:
When it comes to digitization, I maintly use two programs:
Start with the main image everyone uses and write your conscript over it with white. You can probably do this with Paint, but you'll get better results using Photoshop or a free alternative like Krita.
And like many of them, you can also try to integrate a drawing of one of the characters as a letter in the title.
You'll need XQuartz to run Inkscape and Fontforge on MacOS. It allows you to run Unix applications that have not been specifically designed for MacOS. This means that the user interface will be quite un-Mac like with menu bars at the top of the windows and the control key for shortcuts instead of command. On the other hand, a neat thing about using Inkscape in conjunction with Fontforge is that you can design your characters in the more user friendly Inkscape and then copy-paste them into Fontforge.
Here's a series of tutorials on how to use Inkscape and Fontforge. Be warned: they quickly become very advanced.
Tulisan Melayu is a Brahmic-based concript I made for Malay. You can see it here on a poster for a brown sugar bubble tea promotion.
The post also includes versions in Tulisan Rumi (Roman alphabet) and Tulisan Jawi (Arabic alphabet), both of which are used to write Malay.
Credit for the original poster goes to the user photographeeasia on Freepik. Please see the original here: https://www.freepik.com/free-vector/brown-sugar-bubble-milk-tea-set-poster-ad-flyer-template-watercolor-illustration_5124838.htm.
One note on the language. I made this script along with an alternate history scenario where Malaysia is still mostly Hindu-Buddhist. Thus, the Malay word for Tuesday (selasa) which is Arabic in origin has been replaced by anggara which is of Sanskrit origin. That's all!
Cool!
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I don't generally recommend how-to books for language invention, and am a little on the fence about this one, but you may want to look into u/Dedalvs's new book Create Your Own Secret Language.
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I'm considering getting this for one of my nephews.