ICC profiles for DTF: what they do, where to get one, and the one rule that breaks colour

Ink limits first

Film cannot take 400 % ink. Before any profile, cap each channel (C 80, M 80, Y 70, K 70 is the BlackBox default for the L805) and the total (220–280 %). Too much ink pools, cures slowly and cracks; too little looks washed out.

Which profile

• The best profile is made for your exact ink, film, resolution and press temperature, from a printed target measured with an i1Pro or ColorMunki.
• Second best: the profile that came with your kit or your previous RIP (for example the L1800-L805-L800 profile many BlackBox users have). ZoroPrint imports .icc and .icm files, v2 and v4.
• No profile at all still works — the built-in separation is sane — but you will hand-tune saturation.

Rendering intent

• Perceptual for photos: keeps tonal relationships, compresses the gamut gently.
• Relative colorimetric for logos and flat colours: exact where the ink can reach, clipped where it cannot.

The rule that breaks colour

Convert once. If Photoshop already converted the file to a printer profile and the RIP converts it again, you get double correction: greys go blue, skin goes green. Keep files in sRGB (or AdobeRGB with the embedded profile) and let the RIP do the single conversion.