I was looking to write my son's nickname in multi color. I had already tried some colors in svg but I was looking for something more degraded and colorful.
I use inskape and degrade the background from very black to light grey (see screenshot).
don't go too much towards white otherwise it will be too light in xcs
I'm using grayscale for bitmap mode and I'm looking for the point where the colors start to appear.
At first, I played with power (according to the shades indicated in inskape).
I gradually increased the duration in µs
then to darken I played with the dpi