At Pulse Merch in Cedar City, we run simulated process screen printing whenever a customer wants a photorealistic design to hold up on a dark or midtone shirt, not just look good on the screen. It is the method behind full-color mascot art, gradient sunsets on event shirts, and detailed logos that need to survive years of washing on a work crew’s uniform.
The short version: simulated process uses multiple opaque spot color screens plus an opaque white underbase to fake continuous-tone photography with halftone dots, and it’s built in Adobe Photoshop with colors named or matched against the Pantone Matching System.
Three things to know before you order:
- The white underbase is opaque, not translucent, so it can carry rich color over black or navy fabric without the shirt showing through.
- Screen count typically runs several screens, well above the 4 screens the standard CMYK process uses.
- On black garments, a properly separated 6 to 8 color job can hit roughly 80 to 90 percent of the original image’s color accuracy, while four-color CMYK on the same shirt falls well short.
Pro Tip: If your art has fine gradients or skin tones, ask your printer for a proof on the actual garment color you’re ordering, not a white mockup. Colors shift more than most customers expect once they hit black cotton.
Simulated Process vs. CMYK, Spot Color, and DTG
Every buyer eventually asks which method fits their job. Here’s the practical breakdown we use with customers at the counter.
| Method | Best for | Garment fit | Typical screens | Setup complexity |
|---|---|---|---|---|
| Simulated process | Photorealistic art, gradients, dark garments | Dark or midtone | 6 to 12 | High |
| CMYK process | Full-color art on light garments | White or light | 4 | Moderate |
| Spot color | Logos, flat brand colors, retrieval jobs | Any | 1 to 6 | Low |
| DTG | Small runs, photo art, light garments | Mostly light | N/A (digital) | Low setup, slower per piece |
Choose simulated process when you need photorealistic detail on a black or navy shirt for retail merch, sports teams, or branded event apparel, and you’re printing enough pieces to justify the screens. Skip it for a 12-piece order, for artwork that’s mostly small vector text, or when your press schedule can’t absorb the extra setup time.
Where it wins:
- Deep, saturated color on dark fabric that DTG and CMYK can’t match
- Better long-term wash durability than most digital printing on high-movement garments
- Repeatable results once screens and curves are dialed in for reorders
Where it costs you:
- More setup time and screens than spot color or CMYK
- Registration becomes unforgiving with 8+ color plates
- Rarely worth it below 24 to 36 pieces per design
How Do You Build the Color Separations?
This is where a job either prints clean or turns into a muddy mess on press. Here’s the order we follow on every simulated process file.
- Start in RGB, stay in RGB. Don’t convert to CMYK. Build your channel separations off the original RGB file at 300 PPI at actual print size.
- Build the tonal underbase first. A halftoned white underbase, heavier in shadows, lighter in highlights, gives the print depth. A flat, solid white underbase makes prints look chalky and stickerish, which is the single most common mistake we catch on incoming files.
- Assign spot channels for your main colors in Photoshop, then set the Solidity value on each channel to match how translucent that ink actually prints, usually in the 25 to 75 percent range, with 25 to 35 percent common on mixing colors.
- Set halftone angles by channel dominance. Put your dominant color around 45 degrees to avoid moiré patterns against neighboring screens.
- Match mesh to detail level. Use 110 to 156 mesh for heavy ink laydown like the underbase, and 230 to 305 mesh for fine halftone detail plates.
- Output film at 1200 dpi or better. Weak film density kills halftone fidelity before the screen is even exposed.
- Print a test patch. Before committing to a full run, print a 2 inch solid patch of your riskiest color to confirm it matches the intended visual value on the actual garment color.
- Build a custom dot gain curve for your mesh count and ink, since generic CMYK profiles don’t reflect how plastisol actually spreads on screen.
Pro Tip: The most common separator mistake we see is chasing more colors instead of better ones. A tight 7 color separation with correct dot gain curves almost always outprints a rushed 14 color file. Fewer, well-controlled inks hold registration better on press.
What Press Settings Actually Prevent a Muddy Print?
Good separations still fail on a poorly tuned press. Here’s the checklist our pressroom runs before any simulated process job goes to full production.
- Screen tension: hold at least 25 N/cm. Below that, halftone dots won’t stay sharp and detail plates blur.
- Off-contact: keep it around 1/16 inch. Too much off-contact smears fine dots; too little causes ink smudging on release.
- Squeegee durometer: medium to medium-firm blades give cleaner dot definition than soft blades on detail screens.
- Flash curing: flash the underbase enough to gel it, not fully cure it, before laying color on top, or you’ll get poor adhesion between layers.
- Print order: tonal underbase, then midtones, then darks and shadows, then highlight white last, printed wet-on-wet where possible.
Common problems on press:
- Dots washing out or disappearing: usually overexposed screens or too much squeegee pressure.
- Dots filling in solid: underexposed screens or mesh too coarse for the detail level.
- Colors shifting muddy: wrong print order, or an ink too opaque sitting where a translucent layer was needed.
- Registration drifting mid-run: retension the screen, recheck platen alignment, and confirm pallet tape hasn’t shifted.
Pro Tip: Pull a printed sample every 50 to 75 pieces on longer runs and hold it against your approved proof. Simulated process drifts faster than spot color because you’re stacking more layers, and small shifts compound.
Is Simulated Process Worth the Extra Setup Time?
For the right job, yes. For the wrong one, it’s an expensive way to get a mediocre print.
Pros:
- Best color fidelity available on dark garments among screen methods
- Plastisol ink laydown holds up to repeated washing far better than most digital transfers
- Once curves and screens are dialed in, reorders print consistently
Cons:
- Setup time and screen costs are higher than spot color or CMYK
- Registration tolerance shrinks as you add plates, raising the skill floor for the operator
- Rarely economical under 24 to 36 pieces per design
If your art is a flat logo, spot color wins on cost and speed. If you’re printing full color on a white shirt in a small run, DTG or CMYK often makes more sense. If you need a photorealistic image to survive on a black work shirt for two years, simulated process is the right tool. See our breakdown on screen printing versus digital printing for more on that decision.
What Should You Send Your Printer for Separations?
Getting the file right the first time saves a reprint fee and a week of turnaround. Here’s what we ask for.
- Adobe Photoshop master file, layered, at 300 PPI at actual print size, kept in RGB
- Separation work done in Photoshop using spot channels, or handled through automated separation plugins like nChannel or Separation Studio when the shop runs high volume and needs faster turnaround on complex art
- Pantone or PMS references for any color that needs to match a brand standard exactly
- A photo or swatch of the actual garment color the design will print on, since separations built against a screen mockup rarely translate directly to fabric
- Flattened proof files saved as TIFF alongside the layered PSD, so approval doesn’t require opening the working file
Pro Tip: If you don’t have in-house separation skill, don’t force a designer to fake it. A bad separation costs more in reprints than paying a specialist to build it correctly the first time. Our screen printing process page walks through how we handle this in-house.
What Do Most Customers Get Wrong on Their First Order?
The most common mistake we catch is low-resolution art pulled from a website or social media post, then asked to print at 12 inches with fine gradient detail. We either work with the customer to source better art or manage expectations on how much detail the print can realistically hold.
For durability, fabric choice matters as much as the ink. Cotton/poly blends, especially heavier 60/40 combed ringspun builds, resist pilling and hold color longer on crew and team uniforms. Moisture-wicking synthetics work for athletic use but need lower cure temps and specialized ink to avoid dye migration, that ghost-colored bleed you sometimes see under printed graphics on synthetic jerseys.
Rule of thumb: for construction crews and daily-wear uniforms, we push customers toward heavier cotton/poly blends over thin tri-blends. If the garment gets washed daily and needs a small, durable logo instead of a photorealistic design, embroidery usually outlasts any printed method.
When I Recommend Simulated Process to a Customer
I’ve watched simulated process go from a niche technique to our most requested method for dark garment orders over the past several years. What makes it repeatable isn’t the ink, it’s documentation. We log mesh counts, exposure times, and dot gain curves for every approved job so a reorder six months later matches the original run, not a close guess.
I steer customers toward simulated process for photorealistic art on dark shirts and toward spot color or embroidery when the design is simple and durability under heavy wear matters more than color range.
Get a Proof Before You Commit to a Full Run
If you’re weighing simulated process for a team order, an event run, or branded workwear, don’t guess on color from a screen mockup. We build a sample proof on your actual garment color before any full production run, and we document the mesh counts, screen tension, and dot gain curves so reorders match the first batch instead of drifting further off with each run.
Our screen printing process page covers how prepress checks and sample proofs work before we commit to full production. For bulk team or business orders, our screen printing guide for businesses covers run-size and turnaround expectations. Ready to see what a proof looks like on your art and garment? Request a quote and we’ll walk you through mesh, ink, and color options before anything goes to press.
Sources
- Simulated Process Screen Printing Tips – Monarch Color Corp
- Simulated color separation – Dragonfly Colors
- Getting the Most from Simulated-Process-Color Reproduction – Screen Printing Magazine
- Simulated Process Color Screen Printing: How to Print Photorealistic Designs — Printable Press
FAQ
What Are the Six Types of Screen Printing Process?
Shops generally group screen printing into spot color, simulated process, CMYK (process color), index separations, discharge printing, and specialty finishes like puff or foil. Simulated process and CMYK are the two most commonly confused, since both aim for full-color, photo-style results.
What’s the Difference Between CMYK and Simulated Process Printing?
CMYK uses 4 transparent process screens and works best on white or light garments, while simulated process uses 6 to 12 opaque spot colors plus an opaque underbase to hold color and detail on dark fabric. On black shirts, simulated process typically delivers far better color accuracy than CMYK.
Is DTF Replacing Screen Printing?
Direct-to-film has grown for small runs and fast turnaround, but it hasn’t replaced screen printing for durability or cost efficiency on mid to large orders. For heavily worn uniforms and team apparel, plastisol screen printing generally outlasts DTF transfers under repeated washing and abrasion.
What Is Simulated Process Printing Used For?
It’s used to reproduce photorealistic images, gradients, and detailed full-color art on garments, especially dark or midtone shirts where standard CMYK loses color accuracy. Bands, sports teams, and retail merch brands use it most often for detailed logo or photo-based designs.
How Many Screens Does a Simulated Process Job Need?
Most jobs run 6 to 12 screens depending on detail and color range, compared to 4 for standard CMYK. Some approaches use as few as 6 to 8 with translucent ink mixing, while opaque-heavy methods can push toward 13 to 16 colors.
What’s the Smallest Order Size Worth Doing in Simulated Process?
Given the setup time and screen costs involved, most shops, including Pulse Merch, recommend at least 24 to 36 pieces per design to justify the process. Below that, spot color or DTG usually delivers better value.
Does Simulated Process Hold Up to Frequent Washing?
Yes, when printed with proper cure temperatures and a well-built ink deposit, plastisol-based simulated process holds color and detail through years of regular washing. Fabric choice matters too. Heavier cotton/poly blends resist wear better than thin cotton on high-movement garments.