DTF White Underbase Ink & Choke Estimator
Direct-to-Film (DTF) apparel printing requires a solid white ink underbase behind color artwork so prints stay vibrant on black and dark cotton/poly garments. Calculate exact white and CMYK ink consumption, choke pixel margins, and per-shirt transfer costs.
Print Dimensions & Coverage
Ink Volume & Costs
White Ink Per Transfer:
1.42 ml
CMYK Ink Per Transfer:
0.68 ml
Total Ink Per Transfer:
2.10 ml
Ink Cost Per Transfer:
$0.094
Batch Total Ink Expense:
$4.70 (105 ml)
White Edge Peaking Risk
Zero (0%)
Choked vector contours guarantee zero white outline peaking.
Optimal DTF Output: Crisp vector paths allow precision RIP choking (2px offset) without losing small text or fine color details.
What is DTF White Choke and Why Does It Matter?
In Direct-to-Film printing, the printer heads lay down the colored CMYK image first onto the PET release film, followed immediately by a second pass of opaque white ink directly over top of the color layer. After printing, hot melt adhesive powder (polyurethane) is applied and cured in an oven or heat tunnel.
DTF Underbase Formula:
Area_sq_in = Width * Height * (Coverage% / 100)
White_ml = Area_sq_in * 0.018 * (WhiteDensity% / 100) * (DpiMultiplier)
CMYK_ml = Area_sq_in * 0.009 * (DpiMultiplier)
Why Low-Res Raster Artwork Causes White Halo Peaking
When you print low-resolution bitmaps (72–150 DPI PNGs or JPEGs with semi-transparent feathered edges):
- Feathered Transparency Mismatch: RIP software (AcroRIP, Cadlink Digital Factory, Maintop, Flexi) cannot reliably detect where the color boundary terminates when pixels are anti-aliased.
- White Peaking / Halo Effect: When the heat press transfers the design onto a black or navy t-shirt, an ugly white hairline fringe shows around every letter and character.
- Powder Bridge Clumping: Anti-aliased semi-transparent pixels capture adhesive powder particles, leaving a cloudy adhesive border on the garment.
- Mathematical Vector Superiority: True vector shapes (SVG/EPS) have crisp binary 100% alpha boundaries, allowing the RIP engine to compute a perfect 1.5–2.0 pixel choke so the white base stays 100% hidden beneath the CMYK layer.