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Prepare artwork for DTF (Direct-to-Film) printing | Chamevo Support Center
Prepare artwork for DTF (Direct-to-Film) printing
Learn how to prepare print-ready artwork for DTF transfers, including file format, resolution, white ink layer, and color settings.
Updated April 27, 20265 min read
DTF (Direct-to-Film) printing transfers full-color designs onto fabric using a special film, adhesive powder, and heat press. It works on cotton, polyester, blends, and even some non-fabric surfaces. Preparing artwork correctly prevents wasted film, weak transfers, and color issues.
How DTF printing works
The printer prints the design onto a PET film — first the color layer (CMYK), then a white ink layer underneath.
Adhesive powder is applied to the wet ink and melted in a curing oven.
The cured transfer is heat-pressed onto the garment. The adhesive bonds the ink to the fabric.
The film is peeled away, leaving the design on the garment.
The white ink layer is critical. It sits between the color layer and the fabric, providing opacity so colors appear vivid on any garment color — dark or light.
File format requirements
Requirement
Recommended
Notes
File format
PNG (32-bit with alpha)
Transparency defines where ink is NOT applied. JPEG does not support transparency
Color mode
RGB (sRGB)
Most DTF RIP software converts to CMYK+White internally
Resolution
300 DPI at final print size
150 DPI minimum. Below 150, text and fine details visibly degrade
Transparency
Required
Transparent areas = no ink, no adhesive, no film residue. The garment shows through cleanly
A white background prints as a white rectangle on the garment
PNG with transparency is the standard for DTF. If you deliver a JPEG or a PNG with a white background, the entire rectangular area will print — including the background — creating an unwanted white box around the design.
The white ink layer
White ink is what makes DTF work on dark fabrics. Without it, colors printed directly on dark fabric would be invisible or heavily shifted.
How white ink is generated
Most DTF workflows generate the white ink layer automatically from the artwork:
Transparent areas → no white ink, no color ink. The garment shows through.
Opaque areas → white ink is printed as a base layer, then color ink is printed on top.
Semi-transparent areas → partial white ink. This allows the garment color to influence the final appearance.
The DTF RIP software (the print driver) reads the alpha channel of your PNG file to determine where and how much white ink to apply.
White ink settings
DTF RIP software typically offers these white ink controls:
Setting
What it does
Typical value
White underbase
Prints white under all colored areas
Always on for dark garments
Choke
Shrinks the white layer slightly inward from the color edge
1–2 pixels. Prevents white peeking out around the design
White density
Controls how thick the white layer is
60–100%. Higher = more opaque on dark fabrics. Lower = softer hand feel
Highlight white
Prints white only under light-colored areas, not under dark areas
Use for light garments to reduce ink usage
These settings are controlled in the RIP software, not in your artwork file. But understanding them helps you design artwork that transfers well.
Artwork preparation checklist
Resolution and size
Set the artwork to the exact print dimensions at 300 DPI. A 10 × 12 inch print area needs a 3000 × 3600 pixel image.
Do not scale the artwork up after creation. Upscaling adds pixels but not detail.
If the source artwork is low resolution, consider AI upscaling before sending to print. AI upscaling improves detail but is not a substitute for a high-resolution source.
Transparency
Save as PNG-24 or PNG-32 with alpha channel.
Remove any white or colored background. Only the design elements should be opaque.
Check edges carefully. Anti-aliased edges (smooth edges) create semi-transparent pixels. These are fine — the RIP software handles them. But a stray 1-pixel white border around the design will print as a faint white outline.
Colors
Work in RGB (sRGB). The RIP software converts to the printer's ink set.
Avoid extremely saturated neon colors. DTF ink on fabric does not match screen neon.
If the design includes black areas, use a rich black in the design (R=30, G=30, B=30 or similar dark value). Pure black (R=0, G=0, B=0) is acceptable — the RIP handles it — but some designers prefer a slightly warm or cool black for visual preference.
Test a print sample for color-critical work. DTF colors vary between printer models, ink brands, and film types.
Text and fine details
Minimum text size: 8pt for sans-serif fonts, 12pt for script or decorative fonts. Below this, fine strokes may not hold up during the transfer and wash process.
Convert text to outlines (paths) if delivering the final file as SVG or if there is any risk of font substitution.
Thin lines (under 1pt / 0.35mm) may not transfer cleanly. Thicken them to at least 1pt.
Design edges
DTF does not require bleed in the traditional sense (there is no trimming). The transparent background defines the design boundary.
However, leave a small margin (2–3mm) around the outermost design elements if you want breathing room between the design edge and the transfer edge.
Avoid designs that extend to the very edge of the printable area. Heat press alignment has minor tolerances.
Common DTF artwork problems
White background prints as a rectangle
Problem: The garment has a visible white box around the design.
Fix: Open the file and confirm the background is transparent, not white. Re-save as PNG with alpha channel. In Photoshop, check the Layers panel — if the background layer is locked and white, delete it or convert it to a regular layer and erase the background.
Colors look washed out on dark garments
Problem: The design looks faded on black or navy fabric.
Fix: Increase white ink density in the RIP software. The white underbase layer needs to be thick enough to block the garment color from showing through. 80–100% density is typical for dark garments.
White ink peeking out around design edges
Problem: A thin white border is visible around the design on dark garments.
Fix: Increase the choke setting in the RIP software by 1–2 pixels. This shrinks the white layer slightly inward so it does not extend past the color layer.
Design cracks or peels after washing
Problem: The transfer starts peeling or cracking after a few washes.
Fix: This is usually a production issue, not an artwork issue. Common causes: incorrect press temperature (typically 160–170°C / 320–340°F), insufficient press time (10–15 seconds), or low-quality adhesive powder. If the artwork has very fine lines or isolated small elements, they are more prone to peeling — consider thickening them.
Gradients or shadows look banded
Problem: Smooth gradients in the design appear stepped or banded in the print.
Fix: Ensure the source file is at least 300 DPI. Low-resolution gradients band more visibly. Also check the RIP software's color settings — some RIPs reduce color depth to speed up printing, which can cause banding.
Q: Can I use JPEG files for DTF printing?
A: JPEG does not support transparency. The entire image rectangle — including the background — will print. Use PNG with a transparent background instead.
Q: Do I need to create the white ink layer myself?
A: No. DTF RIP software generates the white layer automatically from the alpha channel in your PNG file. Opaque areas get white ink, transparent areas do not.
Q: Can DTF print on dark garments?
A: Yes. The white ink underbase makes DTF one of the best methods for full-color prints on dark fabrics. No manual color separation is needed.
Q: What is the maximum print size for DTF?
A: It depends on the printer's film width. Common DTF printers handle 30cm (12 in), 60cm (24 in), or wider film rolls. The length is limited only by the roll length. Check with your DTF supplier for their maximum dimensions.
Q: Is DTF good for single orders or only bulk?
A: DTF is excellent for single orders. There is no screen setup, no minimum order, and the cost per print is consistent whether you print 1 or 100. This makes it ideal for print-on-demand and product customization workflows.
