I found this and as I have worked with gimp print for a while now , I can tell you it works good.
It is an option for Epson printers dedicated to DTG.

This application will alter the standard Gutenprint definition files to enable them to print 1) A white under-base and 2) A three color composite image for use with direct to garment printers. If you're looking for a free Epson RIP then this is the closest you will ever get.

The second component of this project will be a plugin written in C# for Gimp that will create two layers from an image. One for a white underbase and another for the image to be printed on a garment.

Please send me a message if you are interested in being involved.

Licensed under a Creative Commons Attribution Share-Alike Non-Commercial 3.0 License.

Wingp (Windows Port of Gutenprint) is Licensed under GNU GPL v3.

Gutenprint Copyright 2008 Robert Krawitz ([email protected])

For Windows