Halftone & Simulated Process Screen Printing Guide
Rob Krause
Owner, Battle Born Clothing & Print - Yerington, NV - Published March 11, 2026
TL;DR - How Dots Become Photos on Shirts
Screen printing can only lay down solid ink. To create gradients, shading, and photorealistic images, the artwork is converted into halftone dots of varying sizes - big dots for dark areas, small dots for highlights. This is the same technique behind comic books, newspaper photos, and magazine printing. For full-color images, we use either CMYK process (four transparent colors on light shirts) or simulated process (6-8 opaque spot colors on dark shirts). Battle Born runs elliptical dots at 22.5 LPI frequency, exposed with CCI LED emulsion on EcoClick frames using a custom-built vacuum LED exposure unit. The result: photorealistic prints with smooth gradations that most shops cannot replicate.
Grab the nearest magazine, comic book, or newspaper. Hold it up close - really close - and look at any photograph or color illustration. What you will see is not continuous color. It is thousands of tiny dots in different sizes, arranged in a precise pattern. Your eye blends them together at normal viewing distance, and your brain interprets it as a smooth photograph.
That is a halftone. And it is the exact same technique we use to print photorealistic images, gradients, and complex shading on t-shirts.
Screen printing is fundamentally a solid-ink process. Ink either goes through the mesh or it does not. There is no "print this area at 40% opacity" setting on a screen. But by converting continuous-tone images into dots of varying sizes, we trick the eye into seeing tonal range from a process that can only print solid. It is clever, it is precise, and when it is done right, it is stunning. When it is done wrong, you get muddy blobs with visible dot patterns and color shifts.
This guide explains how halftones work, why they matter, the difference between CMYK and simulated process, how we avoid moire patterns, and what equipment makes the difference between a clean halftone print and a mess. No sloppy Cricut images here - this is production-grade screen printing science.
How Halftone Dots Create the Illusion of Tone
A halftone takes a continuous-tone image (like a photograph) and breaks it into a grid of dots. Each dot is printed as solid ink, but the dots vary in size:
●
Large Dot = Dark Area
More ink coverage, less fabric showing
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Medium Dot = Midtone
Balanced ink-to-fabric ratio
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Small Dot = Highlight
Minimal ink, mostly fabric showing
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Tiny/No Dot = White
Pure fabric color, no ink
At normal viewing distance, your eye cannot resolve the individual dots. Your brain averages the ink coverage and fabric color together, perceiving smooth tonal gradations. This is the same optical illusion that drives pointillist painting, newspaper halftones, and the CMYK process behind every color magazine photo you have ever seen.
Halftones Are Everywhere (Not Just T-Shirts)
If you have ever looked closely at printed media, you have seen halftones at work:
Comic Books
Classic comics used Ben-Day dots (a form of halftone) to create shading and secondary colors from limited ink palettes. The distinctive dot pattern of vintage comics - visible on skin tones and backgrounds - is halftone printing at a coarse frequency. That "pop art" aesthetic Roy Lichtenstein made famous? Halftone dots blown up to canvas scale.
Newspapers
Every photograph in every newspaper ever printed is a halftone. The coarse newsprint and fast web presses require large, widely-spaced dots (typically 85 LPI) - which is why newspaper photos look grainy up close. The low resolution is a feature, not a bug - it matches the paper quality and viewing distance.
Magazines & Offset Printing
Glossy magazine photos use much finer halftone dots (150-175 LPI) on high-quality coated paper. The dots are so small you need a magnifying glass to see them. This is the gold standard of CMYK halftone printing - the same four-color process we adapt for screen printing on garments.
"One of the secrets to printing photorealistic images is HOLD THE DOTS on the film and on the screen. If you lose halftone dots then the image on the shirt will not look like the image on the computer."
- Scott Fresener, T-Biz Network - "Halftone Dots Made Easy"
CMYK Process vs Simulated Process Color
There are two main approaches to printing full-color photorealistic images on garments, and they work very differently:
Four transparent ink colors - Cyan, Magenta, Yellow, and Black - printed as overlapping halftone dots at different angles. The transparent inks mix where dots overlap, creating a full spectrum of colors. The same process behind every color magazine, poster, and packaging print.
Best for: White and light shirts. Transparent inks rely on the white fabric to reflect color back to the viewer. On dark garments, the colors disappear.
Screens needed: 4 minimum (C, M, Y, K) + optional white underbase and spot colors for punch
Simulated Process Color
Uses 6-8 opaque spot colors (including a white underbase and highlight white) with halftone dots to create photorealistic images. Each color channel is a standard all-purpose plastisol ink - not transparent CMYK. The opaque inks cover the dark garment, and the halftone dots create smooth gradations within each color.
Best for: Dark garments. This is how you get bright, photorealistic prints on black, navy, and dark-colored shirts. The opaque underbase + opaque spot colors overcome the dark fabric.
Screens needed: 6-8 typically. This is where the M&R GT-8's 8 print heads become essential.
Dot Shapes: Why We Use Elliptical
Not all halftone dots are created equal. The shape of the dot affects how smoothly tones transition, especially in the critical midtone range around 50%:
Round dots grow evenly in all directions. At the 50% tonal value, adjacent round dots suddenly touch and merge, creating an abrupt visual jump in tone. This "dot gain cliff" produces a noticeable banding effect in printed gradients.
Elliptical dots (our choice) are slightly oval. They connect along their narrow axis first, creating a gradual chain-link pattern as they grow. This produces smoother midtone transitions without the abrupt tonal jump. The result is visibly better gradations in skin tones, sky gradients, and any area with subtle tonal changes.
Square dots provide maximum ink coverage at each tonal value. They are used primarily in index color (stochastic) separations where all dots are the same size and randomly placed, rather than in traditional halftone patterns.
Our Setup
Battle Born runs elliptical dots at 22.5 LPI frequency as our standard halftone configuration. This combination gives us smooth midtone transitions with enough dot size to hold cleanly on our mesh counts and survive the press without dot gain destroying the detail. We have tested round and square dots extensively, and the elliptical consistently produces the best visible result on garments.
Line Frequency (LPI): How Fine is Fine Enough?
LPI (lines per inch) determines the spacing and size of halftone dots. Think of it as the resolution of your halftone pattern:
Important: Do not confuse LPI with DPI. DPI (dots per inch) refers to the resolution of your printer or scanner output. LPI (lines per inch) refers to the halftone dot frequency. They are related but different measurements. Your output film might be 1440 DPI, but the halftone pattern within it could be 55 LPI. Higher DPI gives you cleaner, sharper halftone dots - but the LPI determines how fine the pattern itself is.
Moire Patterns: The Enemy of Halftone Printing
Moire (pronounced "mwah-RAY") is the single biggest problem in multi-color halftone screen printing. It is an unwanted visual interference pattern that appears when two or more halftone dot grids overlap at conflicting angles. It looks like wavy lines, a plaid texture, or a shimmering distortion across the print.
Moire can happen in three places, and a good printer has to account for all three:
1. Between Color Layers
When two halftone screens are printed at angles that are too close together, the dot patterns interfere with each other. Classic CMYK uses angles like 15, 45, 0, and 75 degrees to separate the layers. If angles are off by even a few degrees, moire appears.
2. Between Dots and Mesh
The screen mesh itself is a grid pattern. When halftone dots align with the mesh grid at certain angles, a visible interference pattern appears in the print. This is why halftone angle selection must account for the mesh count being used.
3. Between Dots and Fabric Weave
The shirt fabric itself has a weave pattern. On tightly woven shirts, the fabric structure can interact with the halftone dot pattern. This is less common but can appear on certain poly-blend fabrics with very regular weave structures.
How We Avoid Moire at Battle Born
Our approach to moire avoidance is built into the entire workflow:
Angle selection: We use 22.5 degrees for all colors in simulated process work. For CMYK process, we use the traditional angle offsets (C 15, M 75, Y 0, K 45) when a rosette pattern is needed, but we have found that 22.5 degrees on all channels works cleanly for most simulated process jobs. This matches the advice from industry experts like Scott Fresener at T-Biz Network.
Mesh count matching: The mesh count of the screen must be compatible with the halftone frequency. A general rule: the mesh count should be roughly 4-5x the LPI. So at 22.5 LPI, a 110 mesh works. At 55 LPI, you need 230-305 mesh. Using a mesh that is too close to the LPI multiple creates mesh-dot moire.
Elliptical dot shape: Elliptical dots are more forgiving of slight angle misalignment than round dots because the oval shape creates less regular interference patterns. This is another reason we chose elliptical over round for our standard workflow.
Test prints: On critical jobs, we run a small test batch before committing to the full run. Moire can be difficult to predict from film alone - sometimes it only appears on the actual fabric with the actual mesh. A test print catches it before you have 500 shirts with a visible pattern.
Our Screen-Making Process: Holding the Dots
The entire halftone game comes down to one thing: can you hold the dots on the screen? If tiny halftone dots in the 5-10% range wash away during screen development, you lose highlight detail and the print looks flat. If dots fill in during exposure, shadows go muddy and dark areas turn to solid blobs. Here is our screen-making workflow for halftone work:
Frames: Italian Saati Hi-TEX mesh on EcoClick frames. Properly tensioned to 25+ Newtons. Tight screens are non-negotiable for halftone work - loose screens mean inconsistent off-contact, dot gain, and registration drift.
Emulsion: High-quality LED emulsion from CCI. This is a pure photopolymer emulsion optimized for LED exposure units. Pure photopolymer emulsions expose faster and hold finer detail than dual-cure alternatives - critical for holding 5% dots cleanly.
Exposure: Custom-built vacuum LED exposure unit. The vacuum draws the film flat against the emulsion for perfect contact - even tiny air gaps between film and emulsion cause light undercut that destroys fine dots. LED exposure gives us precise, repeatable exposure times down to seconds.
Coating: Thin, even coats applied with the sharp edge of the scoop coater. One coat outside, one coat inside. For underbase screens that need to hold halftone dots, we add a second outside coat after the first is dry. Thinner emulsion = finer dot resolution.
The goal: Hold dots down to 5% on production screens. At 5%, those dots are tiny - barely visible on the film. But they represent the subtle highlight transitions that separate a professional photorealistic print from a muddy amateur one.
Halftones in Action: Recent Prints from Our Shop
Even with one or two colors, halftones add depth, dimension, and visual impact that flat spot color cannot match. These are recent prints off our M&R GT-8 - no sloppy Cricut images here:
Why Simulated Process Needs 8 Print Heads
A typical simulated process job on a dark shirt uses 6-8 screens: white underbase, highlight white, and 4-6 spot colors. Each color is a separate screen on a separate print head. Add a flash station for the underbase, and you are looking at 7-9 stations minimum. A 6-head press simply cannot handle a full simulated process job without compromising colors or doing multiple passes.
Our M&R Gauntlet GT-8 Revolver gives us 8 print heads. After the underbase and flash, we still have 6 heads available for the remaining colors. That is enough for most simulated process separations without dropping channels or dumbing down the artwork. For our existing artwork guide covering file preparation and separation basics, see our complete screen printing artwork guide.
Need Photorealistic Prints That Actually Look Good?
Battle Born runs halftone and simulated process on an M&R GT-8 with CCI LED emulsion on EcoClick frames. Elliptical dots. Proper angle separation. No moire. No muddy blobs. If you have a complex design that your current shop cannot handle, send it to us.
Frequently Asked Questions
What is halftone screen printing?
Halftone screen printing uses tiny dots of varying sizes to create the illusion of continuous tone from solid ink. Larger dots make darker areas, smaller dots make lighter areas. It is the same technique behind comic books, newspapers, and magazine photography. Halftones allow screen printers to reproduce gradients, shading, and photorealistic images.
What is the difference between CMYK process and simulated process?
CMYK uses four transparent inks (Cyan, Magenta, Yellow, Black) on light shirts. Simulated process uses 6-8 opaque spot colors with a white underbase on dark shirts. Simulated produces brighter results on darks because the opaque inks cover the fabric color. Both use halftone dots for tonal gradation.
What is moire and how do you avoid it?
Moire is an unwanted interference pattern that appears when halftone dot grids from different color layers overlap at conflicting angles. It looks like wavy lines or plaid-like distortion. It is avoided through proper angle separation between colors, matching halftone frequency to mesh count, and using elliptical dots that are more forgiving of slight misalignment. Battle Born uses 22.5 degree elliptical dots to minimize moire.
What dot shape is best for screen printing halftones?
Elliptical dots produce the smoothest midtone transitions. Round dots create abrupt tonal jumps at the 50% point where adjacent dots suddenly merge. Elliptical dots connect gradually along their narrow axis first, producing a smoother chain-link pattern. Battle Born uses elliptical dots at 22.5 LPI as our standard configuration.
What LPI should I use for screen printing halftones?
35 LPI for simple tints, 45 LPI for detailed shading, 55 LPI for photorealistic images. Higher LPI requires tighter screen tension and better exposure. The mesh count should be roughly 4-5x the LPI to avoid mesh-dot moire. Battle Born calibrates LPI to our specific mesh counts and press setup.
Can you screen print photographs on t-shirts?
Yes. Photos are separated into color channels, converted to halftone dots, and printed through individual screens. CMYK works best on white/light shirts, simulated process works best on darks. Quality depends on separation skill, screen tension, dot resolution, and registration precision. Our M&R GT-8 with 8 heads handles the complex multi-screen setups that photorealistic prints require.
More Screen Printing Guides from Battle Born
Underbase Printing Explained →
How we print bright colors on dark shirts
Plastisol vs Water-Based Ink →
Which ink type is right for your project?
What Is Discharge Ink? →
The soft-hand secret for dark garments
Screen Printing Artwork Guide →
From vector files to simulated process
Screen Print vs Embroidery vs DTF →
Choosing the right decoration method
Why Your Logo Looks Bad on a T-Shirt →
Common artwork problems and how to fix them