this method can also be used to change the colors of pictures!
first, grab a png of whatever picture you're using. next, import it into ibisPaint X, and alpha lock the picture.
choose a color and set the brush to its biggest size and color over the picture. when it's colored over, it should look like this.
that's it really! :) but before saving it, to keep it as a transparent, you'll go into the layer's settings and change the background into the check board one.
that's all there is to it! like I said earlier, this method can also be used to change colors of other objects like if you want a blue circle instead of a black one and things like that. it's really easy to change colors in this app.
I hope this helped those of you using ibisPaint X! :)