How to prepare artwork for DTF printing (without white halos)

Good DTF artwork is the difference between a crisp, vivid transfer and one with fuzzy edges, ghost boxes and specks. DTF printers print every pixel that isn't fully transparent, so the file has to be clean. Here's the checklist we use.

1. Size it at 300 DPI at the final print size

DTF prints the pixels you give it, so the file needs enough of them. Set the image to the size it will be on the garment, at 300 DPI:

• Left-chest logo, 4 in wide: 1,200 px

• Full front, 11 in wide: 3,300 px

• Oversized back, 14 in wide: 4,200 px

Scaling a small image up in Photoshop doesn't add detail; it only makes the blur bigger. If your original is small, it needs redrawing. What DPI do you need? explains the math.

2. Use a PNG with true transparency

Export a PNG with a transparent background. JPG can't do transparency, so the background will print as a box.

Then check the transparency properly: zoom in to 300–400% over a dark background. Look for:

• Leftover background pixels from a quick background removal

• Soft drop shadows and glows, which are semi-transparent

• Anti-aliased edges that fade to almost-transparent

3. Get rid of semi-transparency

This is the number-one cause of bad DTF prints. A pixel at 10% opacity still prints, usually as a faint, muddy haze or white specks, because the printer lays white ink under it.

Fixes:

• Replace soft shadows and glows with halftone dots, so every dot is solid ink

• Make edges crisp: solid pixels inside, fully transparent outside

• Avoid low-opacity layers and blend modes; flatten and check the result

4. Keep lines and text thick enough

Very thin lines can break up or peel. As a rule of thumb keep lines at least 0.5 mm (about 1.5 pt) and small text at least 8 pt at print size. Thin outlines around a design are the first thing to fail.

5. Watch your colors

• Send RGB (sRGB) unless your printer asks otherwise; most DTF RIP software converts to CMYK itself

• Pure black on a black shirt prints nothing useful. Add a thin outline or use a dark gray

• Bright neons and some Pantone colors are outside the printable range; expect them to shift slightly

6. Remove what you don't want printed

DTF prints white under everything. If the design has a white background or white areas you meant to show the shirt color through, knock them out (make them transparent). This also makes the transfer lighter and more breathable.

7. Pack gang sheets carefully

If you're ordering a gang sheet, leave about 0.25 in (6 mm) between designs for cutting, keep everything at 300 DPI, and match the sheet width your printer uses (22 in is common). Our gang sheet service does the packing for you.

Common DTF file mistakes

These are the problems we fix most often in customer files:

• Exporting at screen size (72 DPI) and letting the printer scale it up

• A white or near-white box left behind the design

• Soft drop shadows, glows and feathered edges

• Hairline outlines from stroked or auto-traced artwork

• Fine text and detail that fill in at the printed size

• Saving as JPG, which removes transparency and adds compression artifacts

Quick DTF file checklist

1. PNG, transparent background

2. 300 DPI at final size

3. No semi-transparent pixels or soft shadows

4. Lines 0.5 mm+, text 8 pt+

5. RGB unless told otherwise

6. Knock out areas meant to show the garment

Let us prep it

Send any design, even a screenshot, and we'll redraw it, clean the transparency and export a print-ready DTF file. DTF files start at $25 with unlimited revisions. Still choosing a method? Read DTF vs DTG.