Printed on the surface
Direct-to-Film (DTF) printing prints your artwork onto a transfer film, coats it with adhesive powder, and heat-presses it onto the finished item. It prints full colour with bright, opaque results on fabrics of any colour — including dark, textured and synthetic materials that direct-to-garment printing struggles with — and it holds a crisp edge. Because the design is a thin flexible layer bonded onto the surface, very fine lines can soften slightly and large solid blocks feel a little smoother to the touch than the fabric around them.
Your artwork is printed in full colour onto a sheet of transfer film, backed with a layer of white ink so the colours stay opaque, and dusted with a heat-activated adhesive. The film is then pressed onto the item, the adhesive bonds to the fabric and the film peels away, leaving only the printed design behind.
Because the white backing is printed as part of the transfer rather than sprayed onto the garment, colours stay bright on black, navy and heather fabrics without the artwork having to fight the material underneath. It is also why the method works on polyester and blends, which do not absorb direct-to-garment ink well.
Bold artwork with clean edges and strong colour is where this method is at its best — logos, lettering, illustrations and vivid graphics all transfer crisply and stay legible after repeated washing.
Photographs reproduce well too. The one thing to keep an eye on is the very finest detail: hairline strokes and single-pixel edges soften slightly as the transfer bonds, so a design that depends on 0.5pt rules will read a little heavier than it does on screen. Thicken anything critical and it will come through exactly as drawn.
The two names are almost identical and the processes have nothing in common. Direct-to-Film — this page — prints a transfer and presses it onto an item that has already been made. Direct-to-fabric prints the cloth on the roll, before anything is cut or sewn, so the colour is in the material itself and covers the whole garment.
If you are designing an all-over pattern that runs across seams, you want the direct-to-fabric guide, not this one.