Simulated process color separation, with the override you will need

What simulated process actually is

Rather than splitting an image into cyan, magenta, yellow and black and printing translucent process inks, simulated process picks a set of opaque plastisol-style inks that suit the image and builds a tonal channel for each one. Every channel is halftoned, and the whole stack sits on a white underbase so the colors read on a black or navy shirt instead of sinking into it. It is the reason a photographic print on a dark garment looks bright rather than muddy, and it is the separation people pay outside services to do for them. What that costs, from published prices: ContractPrinter's photorealistic sim-process tier is $85 and up per design with revisions at $5 each (checked 28 July 2026), and that is the top of the field rather than the middle of it — 24 Hour Seps, Scott Fresener's own service, lists a flat $65 per set for any number of colours (a promotional rate when checked; their volume packs go lower), Burn My Screen a flat $60 per design, and Color-Separation.com $15 to $50 including the underbase and highlight white (all checked 29 July 2026). Call it $50 to $85 for a hard photographic design, plus a revision cycle each time you want a change.

Why there is no one-button version of this

Fully automatic simulated process is unreliable in every tool that sells it. The established desktop packages — vendor-listed at $229 a year for Separation Studio NXT, $345 for T-Seps and $399 for UltraSeps when we checked on 28 July 2026 — all keep manual channel control, and the newer AI-branded services keep it too — because a photograph does not contain a correct answer that an algorithm can find. Skin tones, the point where a red channel should hand off to a magenta one, how hot to run the highlight white: these are press judgements informed by your inks, your mesh and your garment. So the auto pass here is a starting point, deliberately, and the per-channel curve and density override is a first-class control rather than an advanced-settings escape hatch. Anyone selling you a single button for this is selling you a reprint.

What the render produces

From the clustered ink set: one tonal channel per ink, a choked underbase generated from the combined coverage and pulled in so it does not peek out at the edges, a separate highlight white so the brightest highlights print last and hit hardest, per-ink choke and spread, trapping between adjacent inks, a dot-gain compensation curve, and halftone screening at a non-moiré angle set chosen for your ink count. Output is continuous-tone grayscale plates by default — what most RIPs want — or pre-halftoned 1-bit film at 600 or 1200 dpi if you output film directly. Registration marks are a toggle.

What the per-channel override is actually for

It is not a polish step, it is where the separation gets made, so it is worth knowing what each control is for rather than nudging sliders and hoping. A per-channel *density* value scales how much ink that plate lays down overall: you pull a channel back when it is dominating a region it should only be supporting, and push one up when it has come out too thin to hold on press at all. A per-channel *curve* is the finer instrument, because it lets you change where in the tonal range that ink participates — lift the shadow end of a channel that has gone hollow in the darks, or flatten its highlight end so it stops bleeding into an area another ink owns. The classic use is a handoff: a red and a magenta that both want the same midtones, where the fix is to curve the red out of the upper midtones and let the magenta carry them, rather than reducing either channel's density and losing it everywhere. The underbase gets a choke amount in pixels and an on/off. The highlight white gets a threshold, which is the control that decides how far down the tonal range your brightest ink reaches. Globally: ink count, tolerance, garment colour, dot gain strength, halftone frequency (35 to 65 lpi is the usual garment range), dot shape, angle set and output DPI. And a live proof renders the separation back over your garment colour, because judging channels in isolation tells you very little — the composite is the only thing the customer will ever see.

How to read a bad channel set

Specific symptoms, specific causes. Skin that has gone grey or muddy usually means too much black or too much of a dark neutral doing work the warm inks should be doing — pull the dark channel back in the midtones and let the reds and yellows carry the flesh. Skin that has gone plastic-orange is the opposite: the warm channel is unrestrained through the highlights. Banding across a smooth gradient means the channels are handing off too abruptly; the fix is overlapping curves so two inks share the transition rather than one stopping where the other starts. A print that looks chalky overall, or a shadow that will not go dark, is almost always the underbase set too hot or thresholded solid — you are lighting the image from below. Highlight white creeping into midtones shows as a washed, powdery look across the whole print and is a threshold set too low. A plate that looks nearly empty in preview is a channel whose density is below what your mesh and emulsion can hold, and it will simply not appear — decide whether to push it or delete it, because a plate that does not print is a screen you burned for nothing. And a colour that looks right on screen but sits dead on the proof over the garment is the reminder that you are separating for opaque ink on fabric, not for a monitor.

Why print order is load-bearing when the inks are opaque

With translucent process inks, order matters at the margins. With opaque inks it changes the image, because each ink genuinely hides what is beneath it — the last plate down is the one you see. So the separation carries a print order and it is not decoration. The underbase goes first and is flash-cured, because wet white under wet colour mixes and ruins both. The colours then run in a deliberate sequence: shops commonly go darker to lighter so the lighter opaque inks sit on top and stay bright, though your inks, your flash and how wet-on-wet you are running decide the details. The highlight white goes last, over everything, which is the only position where it can be the brightest thing in the print. Get the order wrong and the symptoms are confusing rather than obvious: a colour that separated correctly appears absent because a later plate covered it, or a highlight looks dingy because a colour printed on top of it. This is also why the order travels with the file here — in the manifest, in the plate numbering, and in the layer and channel order of the PSD — rather than living in your head or on a sticky note. If your press runs a sequence you trust, override it; a tool arguing with a printer about their own press is not a useful tool.

Priced so you are not afraid of the sliders

Simulated process is 10 credits per image, and for 24 hours after that render you can re-render the same image as often as you like, free, for 24 hours. That is deliberate: a per-render charge would teach you to guess instead of iterate, and iterating is the entire method. Twenty-four hours is also enough to render, burn a test, print it, and come back with real curve values the same day — which is how this actually gets tuned. A print-ready render is 10 credits, a small share of a month’s allowance, and a one-off pack adds credits that never expire — see the pricing page for current prices in your currency. Compare that with per-design separation fees: ContractPrinter's published tiers ran $15 for one or two spot colours up to $85 and above for photorealistic simulated process plus $5 a revision (28 July 2026), while the flat-fee services sit lower — 24 Hour Seps at a promotional $65 per set for any number of colours, Burn My Screen at $60 (29 July 2026). Or compare it with a desktop package you buy once and then need a Windows machine and, for the plug-ins, a Photoshop licence to run.

How to judge the result

On a screen proof, look for banding in gradients, a highlight white that has crept into midtones, and an underbase edge visible past the color plates. Then stop looking at the screen. Simulated process is judged on a printed test — inks and mesh and squeegee pressure change the answer, and the first print on a new setup is where your curve values come from. Keep the settings for the ink set you actually run and reuse them; the second job with the same inks is far quicker than the first.