How to prepare a design for DTF printing

Preparing DTF art starts by setting true print size in centimeters and converting to pixels at 300 DPI (e.g., 28 cm wide ≈ 3307 px). Always work 1:1 on canvas; scaling in the RIP by eye degrades type and edges. In Mexico, WhatsApp JPG logos are common; move clients to PNG, AI, or vector PDF when available. Charging file prep separately educates the market and filters unusable WhatsApp photos. Archiving approved versions with dates ends disputes when clients insist they sent another size.

The most common format is sRGB PNG with a clean alpha channel. Avoid JPG compression on final art; if JPG is all you have, rebuild edges in vector or repaint transparency before white generation. Some RIPs take layered PDF: color on one layer, white on another, bleed marked. Ask your print provider if they charge “file cleanup” and use that to justify prep fees. Signed mockups with centimeter dimensions protect the shop when the claim is perceived size.

DTF reads transparency as “no color ink” but white may behave differently per RIP: some auto-mask, others need a spot channel. Soft edges (shadows, glows, bad PNG export) cause white halos or gray veils after pressing. Rasterize complex effects at 300 DPI with controlled transitions or drop semitransparency for stepped gradients. Checking alpha on a calibrated display and external viewer catches near-white backgrounds the RIP would print. Charging file prep separately educates the market and filters unusable WhatsApp photos.

In Photoshop or Affinity, trim and inspect alpha on a separate channel: any gray that is not 0% or 100% is risk. For logos, convert type to shapes and unify fills. In Illustrator, expand appearances and flatten transparency only on PNG export, keeping editable AI for changes. Archiving approved versions with dates ends disputes when clients insist they sent another size. Signed mockups with centimeter dimensions protect the shop when the claim is perceived size.

White ink is not optional on dark garments or saturated color on black cotton. The RIP builds a white mask from your art; adjust white choke (shrink white under color) to avoid visible white halos. Too much choke loses coverage on yellows and oranges; too little shows white rim after washing. Signed mockups with centimeter dimensions protect the shop when the claim is perceived size. Checking alpha on a calibrated display and external viewer catches near-white backgrounds the RIP would print.

Always sample on black with the same file as production. If the client wants “no white” in an area, it must be true transparency, not RGB black because the RIP may still lay white underneath. For fine white type on black, slightly increase stroke weight in vector before rasterizing. Charging file prep separately educates the market and filters unusable WhatsApp photos. Archiving approved versions with dates ends disputes when clients insist they sent another size.

Work in calibrated sRGB or the space your RIP recommends; traditional CMYK prepress does not always match DTF inks. Oranges, lime greens, and fuchsias are trouble colors: if the brand has Pantone, print a swatch on cotton, do not trust the monitor alone. Screen brightness lies; use a laminated print reference for B2B sales. Archiving approved versions with dates ends disputes when clients insist they sent another size. Signed mockups with centimeter dimensions protect the shop when the claim is perceived size.

Avoid rich black (100% K everywhere) on designs that get full white underneath; black can turn brownish after cure. Prefer soft composite black or let white + CMYK build image blacks. For pure black type on white garments without white ink, workflow differs—confirm whether you print white or color only. Checking alpha on a calibrated display and external viewer catches near-white backgrounds the RIP would print. Charging file prep separately educates the market and filters unusable WhatsApp photos.

If art goes edge to edge (full bleed background), add 2–3 mm bleed beyond the logical trim for press shrink. Without bleed, cotton white lines show at edges. On DTF patches or labels, bleed is even more critical because operators cut by hand or plotter. Signed mockups with centimeter dimensions protect the shop when the claim is perceived size. Checking alpha on a calibrated display and external viewer catches near-white backgrounds the RIP would print.

One-pixel PNG outlines rarely survive: convert to shapes with at least 0.5–1 pt depending on final size. Multiple logos on one gang sheet need clear gaps (5–10 mm) for mental die-cutting and so powder does not bridge neighboring pieces during cure. Charging file prep separately educates the market and filters unusable WhatsApp photos. Archiving approved versions with dates ends disputes when clients insist they sent another size. Signed mockups with centimeter dimensions protect the shop when the claim is perceived size.

Confirm: true cm size, 300 DPI, correct color mode, clean transparency, white reviewed, no hidden off-canvas elements, fonts embedded or outlined, and spelling on names. Open the PNG in an external viewer (not only design app) to catch near-white #fefefe backgrounds. Checking alpha on a calibrated display and external viewer catches near-white backgrounds the RIP would print. Charging file prep separately educates the market and filters unusable WhatsApp photos. Archiving approved versions with dates ends disputes when clients insist they sent another size.

Compare file weight: a 30×30 cm PNG should be several MB; 80 KB suggests compression or fake resolution. Note on the ticket if the job is hot/cold peel and garment type so printers do not guess. Signed mockups with centimeter dimensions protect the shop when the claim is perceived size. Checking alpha on a calibrated display and external viewer catches near-white backgrounds the RIP would print. Charging file prep separately educates the market and filters unusable WhatsApp photos.

Size templates (S, M, L, XL) in Photoshop or Canva Pro speed approvals. Action scripts for choke-ready white exports cut repetitive clicks. If you sell repeat designs, keep a library of elements with transparency already validated on black and white garments. Signed mockups with centimeter dimensions protect the shop when the claim is perceived size. Checking alpha on a calibrated display and external viewer catches near-white backgrounds the RIP would print.

Plug in a vectorizer workflow when clients only bring blurry photos of embroidered logos; charge vectoring separately. For mockups, use real photos of your inventory garments, not generic renders that mismatch neck or exact color. Charging file prep separately educates the market and filters unusable WhatsApp photos. Archiving approved versions with dates ends disputes when clients insist they sent another size. Signed mockups with centimeter dimensions protect the shop when the claim is perceived size.