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Print Artwork Rescue

DTF transfer printing — what the file and the press each have to carry

Direct-to-film sits between two limits. One belongs to the press: heat, time and the smallest detail a transfer can physically hold. The other belongs to the file that arrived in a chat window. Most shop-floor arguments come from treating a file problem as a press problem, or the reverse, so both sets of numbers are worth keeping in one place.

Transfer film, sheet formatA3 — 29.7 cm / 11.7 in usable width
Transfer film, roll format30 and 60 cm rolls are the common shop sizes
Press temperature150-165 °C / 300-330 °F
Press time and pressure10-15 seconds, medium pressure
Peelfilm-dependent — hot peel after about 5 s, cold peel below 40 °C
Second press after peeling5-8 s through parchment, for hand feel and wash durability
Smallest text height that stays open on textileabout 4 mm / 0.16 in at print size
Smallest stroke that survives the transferabout 0.5-0.75 mm
Resolution band that holds on cotton200-300 DPI measured at the size being printed
File the press wantstransparent PNG or vector — the white underbase is generated, not drawn

What the fabric forgives, and what it will not

Cotton scatters light, so a textile print hides softness that the same file would expose on paper. That tolerance is real and it is where the 200 DPI floor comes from. It does not extend to geometry: a hairline thinner than the transfer can hold breaks up regardless of resolution, and a letterform below roughly 4 mm closes into a blob whether the file was 300 DPI or 3000.

  • Softness — largely hidden by the weave
  • Thin strokes and small counters — not hidden, they simply drop out
  • Halos and hard compression edges — more visible on textile, not less

The order the decisions come in

Every job below runs the same sequence, and the expensive mistakes come from jumping a step. Measuring after the blank is loaded costs a blank; asking the customer for a better file after the press is hot costs the slot as well.

  • Measure the file — pixel width, edges, transparency, any text
  • Decide the size — the width those pixels cover is a number, not an opinion
  • Repair only what can be verified afterwards, and keep the original
  • Press to the numbers above, then peel by the film's rule rather than by habit

Where files fail before the press ever runs

The guides under this page each cover one failure that arrives with the artwork rather than with the equipment. They carry their own measurements: pixel thresholds per placement, what each messaging app does to a file, and what the shop should charge or refund when the file cannot be saved.

FAQ

Does DTF need 300 DPI?
300 DPI at final print size is the working target. Because the weave hides some softness, 200-300 DPI passes on most jobs; below 150 DPI the softness is visible on the garment at arm's length. The number that matters is measured at the size being printed, not the one written in the file's metadata.
Why does small text look fine on screen and close up on the shirt?
A monitor shows roughly 72-160 pixels per inch and has no ink spread. The transfer has a physical floor: below about 4 mm of letter height the gaps inside letters fill in. Zooming in on screen removes the exact constraint the garment imposes.
Does a vector file remove every limit?
It removes the pixel ceiling — scale stops mattering to resolution. The physical floors stay: stroke width, text height and how much detail the film can hold do not change with scale, and gradients inside a vector rasterise on export and carry a resolution again.

All guides