Working with bitmap images is a pain. I recommend going vectorial to get your design ready for printing on a t-shirt! :)
Here's an SVG file ready to use to make your life easier:
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Download and edit it with Inkscape - cross-platform and open source like GIMP. ;)
Here's an SVG file ready to use to make your life easier:
Download and edit it with Inkscape - cross-platform and open source like GIMP. ;)