A really quick simple trick to generate textures to use in Phaser3.

You can use simple arrays of strings. The values are hexadecimal. You call another method that will generate the texture from the strings.

exportletbar=["11111111111111111111","1.FEDCBA9876543210.1","11111111111111111111",];this.textures.generate("bar",{data:bar,pixelWidth:16});this.textures.generate("bar8",{data:bar,pixelWidth:8});

Once you have the textures generate with the keys. Then you can use these as if they were image files all along.

letimg=this.add.image(0,0,"bar");img.setOrigin(0,0);letimg2=this.add.image(0,64,"bar8");img2.setOrigin(0,0);

The palette values look like they come from here
https://androidarts.com/palette/16pal.htm

The Phaser3 documentation calls this Arne16. See here:https://photonstorm.github.io/phaser3-docs/Phaser.Textures.TextureManager.html