meagain75 wrote: but the desired colors will only go down to 2.
I probably wasn't clear with my "Desired Colours+1". If you wanted to print one colour, you'd quantise at two colours (foreground and background); if you really wanted two colours, you quantise at three. I'm assuming in all cases you throw the generated background away and use the T-Shirt as real background.
But I noticed that when I exorted then imported to bitmap it permanently grouped my designs. I like that cause I had white text that wouln't show up without a black background.
I've never actually done what you're trying do, so was just trying to suggest something that I thought would work. You might need to add an extra background layer before you start. Just play around with it, and if you find something you think works, come back and tell us.