Should you print this file at the size the customer asked for?
A file is not good or bad on its own; it is good or bad at one specific width. The same artwork that is clean on a left chest is visibly soft across an adult front. The decision comes out of one division, made before film, powder and a blank are spent on it.
| Effective DPI at the requested size | pixel width ÷ print width in inches |
|---|---|
| Safe width the file supports | pixel width ÷ 300 = inches · × 2.54 = cm |
| Left chest, 3.1 in / 8 cm | 945 px needed at 300 DPI |
| Sleeve or pocket, 3.9 in / 10 cm | 1,181 px |
| Youth front, 7.9 in / 20 cm | 2,362 px |
| Adult front, 11 in / 28 cm | 3,307 px |
| Adult back, 13 in / 33 cm | 3,898 px |
| A 1,500 px file across an 11 in front | 136 DPI — under the band where text and hairlines hold |
Turn the request into one number
Divide the artwork's pixel width by the requested print width in inches. That result, not the file's size on disk and not how it looks zoomed on a monitor, is what the press works with. A display shows roughly 72-160 pixels per inch, so artwork nearly always looks better on screen than it will on cotton.
- 300 DPI and above — print at the size requested
- 200-299 DPI — fabric hides most of it; check text and hairlines on a real-size preview first
- 150-199 DPI — workable on text-free illustration, not on lettering; otherwise reduce the width
- Below 150 DPI — printing at the requested size is a decision to accept visible softness, not a technical step
Reducing the size is a repair, not a failure
A file that supports 5.5 in prints correctly at 5.5 in. The same file forced to 11 in produces a garment the customer blames the shop for, even when the shortfall arrived with the artwork. Three exits stay open, and all three cost less than a reprint.
- Print at the width the pixels cover, and say what that width is
- Ask for the source file — a vector or a larger export removes the ceiling entirely
- Print at the requested size with the measured number written on the order and approved by the customer
Vector files change the question
AI, EPS, PDF and SVG carry no pixel ceiling, so the limit moves from the file to the press. What still has a floor is the physical detail a transfer can hold, and those floors do not move with scale.
- Text under roughly 4 mm tall at print size closes up on textile
- Strokes under roughly 0.5-0.75 mm break up on a DTF transfer
- Gradients and drop shadows inside a vector rasterise on export — they carry a resolution again
What the system does with this number
The pipeline measures the file, computes the safe width for the size in question and renders a preview at real size. Where a repair can be verified after it runs, it runs; where the result cannot be verified, the original comes back with the reason attached. No badge declares a file fit to print — the output is the measurement and the width it implies.
FAQ
- Is 300 DPI a hard rule for DTF?
- It is the working target, not a gate. Textile hides softness that paper exposes, so 200-300 DPI passes on most jobs. Below 150 DPI the softness is visible on the garment at normal viewing distance.
- The customer wants 11 in and the file supports 5.5 in. What now?
- Offer the width the file covers, ask for the source file, or print at 11 in with the measured number recorded on the order. The expensive option is printing at 11 in without saying anything, because the complaint then arrives after the blank is used.
- Does upscaling move the decision?
- It raises the pixel count; whether it raises usable detail depends on the artwork. On lettering it redraws letterforms, so the result has to be checked against the original before the new number is trusted.