how-to
How to Prepare Artwork for Screen Printing: 7 Steps
Table of Contents
- Screen Printing Artwork Requirements
- Vector vs Raster for Screen Printing
- Resolution, DPI, and Minimum Line Weight for Screen Printing
- Screen Printing Colour Separation Guide
- Preparing Layers, Registration Marks, and Black and White Artwork
- Common Artwork Preparation Pitfalls and How to Avoid Them
- Automated Pre-Flight Checklist for Screen Printing Artwork
- Conclusion
- Frequently Asked Questions
Last Updated: September 10, 2026
Screen Printing Artwork Requirements
Getting artwork ready for screen printing is where most first-time orders go wrong, long before ink touches fabric. This guide from Workwear East walks through how to prepare artwork for screen printing in seven practical steps. Screen printing artwork requirements are straightforward: a vector-based file, correct resolution, separated colours, and clean registration. Miss any one and the print shop is left guessing, which usually means delays or a result you didn't sign off on.
The core requirements break down into four areas:
- File format: vector preferred, high-resolution raster accepted as a fallback
- Resolution: sharp edges at the intended print size, not the on-screen size
- Colour: separated into individual ink colours, not a single flattened image
- Structure: layers, registration marks, and a clean background
Get these right and the process runs smoothly; get them wrong and you'll pay for reprints.
Vector vs Raster for Screen Printing
Vector graphics are the correct choice for screen printing because they scale to any size without losing sharpness. Raster images, built from pixels, blur and pixelate the moment you enlarge them beyond their original resolution.
A vector file stores shapes as mathematical paths, so a logo drawn at 5cm wide prints just as cleanly at 50cm. A raster file stores a fixed grid of pixels, and stretching it forces the software to invent detail that isn't there, fuzzy edges and jagged curves on the finished garment.
The practical rule:
- Logos, text, and simple shapes: always supply vector (AI, EPS, PDF, or SVG)
- Photographs and complex gradients: supply high-resolution raster, and expect the printer to discuss halftones
- Anything you only have as a JPEG from a website: request the original source file before ordering
If vector isn't available, a raster file can still work, but the resolution has to be high enough for the final print size. That's the next step.
Resolution, DPI, and Minimum Line Weight for Screen Printing
Screen printing needs 300 DPI at the actual print dimensions, not the dimensions you see on screen. A file that looks crisp at 10cm wide can fall apart when scaled to fit the back of a work jacket.
DPI (dots per inch) measures how much detail a raster image holds. For screen printing, 300 DPI at final size is the standard benchmark; below that, edges soften and fine text becomes unreadable. Photographs destined for halftone printing need this headroom because the halftone screen adds further detail loss.
Minimum line weight matters just as much. Very thin lines and small text can clog the mesh or disappear entirely. Keep strokes and text at a weight the mesh can hold, and avoid hairline strokes in logos, if a line is too fine to survive the screen, thicken it in the design rather than hoping it prints.
Screen Printing Colour Separation Guide
Colour separation is the process of splitting your artwork into one layer per ink colour, so the printer knows exactly where each screen deposits ink. This is the single most misunderstood part of how to prepare artwork for screen printing, and where most artwork files quietly fail.
Each colour becomes its own screen: a three-colour logo needs three screens, three passes, and precise alignment. The separation process converts your artwork into these individual plates, usually as black-and-white positives.
How separation actually works
In practice, the artwork is reduced to solid black shapes on a transparent or white background, one layer per ink. The printer outputs each layer onto film or straight to a coated screen via a digital imaging unit; that positive exposes the emulsion, and the exposed screen becomes the stencil.
A flattened JPEG cannot be separated cleanly: there are no discrete shapes to isolate, only blended pixels. Vector artwork, or a well-built layered raster file, gives the separation software distinct objects to assign to each ink.
Spot colour, process, and simulated process
- Spot colours: each ink mixed to an exact specification, ideal for brand logos and any design with a fixed palette. Most branded workwear is printed this way.
- CMYK process: four inks (cyan, magenta, yellow, black) build the image through overlapping halftone dots. Better suited to photographic work, and less common on garments because ink opacity and fabric texture distort the result.
- Simulated process: a hybrid where a photographic image is separated into a limited set of opaque spot inks using halftones. This is how detailed full-colour designs are printed on dark garments without the muddiness of CMYK.
Trapping, knockouts, and overprints
These three terms describe how adjacent and overlapping colours behave on press:
- Knockout: one colour is removed so another can sit cleanly in its place. Without it, two inks overlap and the top one muddies the one beneath.
- Overprint: one ink is printed directly over another, changing the resulting colour. Useful for deliberate blends, dangerous when accidental.
- Trapping: a slight overlap between adjacent colours so small registration shifts don't leave a hairline gap of bare fabric. A fraction of a millimetre is usually enough; too much shows as a dark edge.
Mesh count and separation choices
Mesh count (threads per inch) determines how fine a detail a screen can hold, and it directly affects how you separate artwork:
- Coarse mesh (around 60-110 threads per inch): heavy ink deposit, ideal for bold block colours and dark garments. Fine detail and small halftone dots will clog.
- Medium mesh (around 140-200): the everyday workhorse, balancing detail and ink coverage.
- Fine mesh (around 230-305): holds fine lines and small halftone dots, but deposits less ink, so it struggles with opaque whites and light colours on dark fabric.
A design separated for a fine mesh will not print correctly on a coarse one, and vice versa. If you don't know the mesh count, ask before finalising separations.
A practical separation workflow
- Build the design with one clearly named layer per intended ink colour.
- Convert all text to outlines so fonts don't substitute.
- Expand strokes and flatten transparency, drop shadows, and live effects.
- Assign each colour to its own layer, using spot colour swatches rather than RGB or CMYK values.
- Apply knockouts where colours meet, and add a small trap where registration is critical.
- Output each layer as a solid black shape on a clear background for the positives.
If you'd rather not manage separations, mesh counts, and trapping yourself, our team at Workwear East handles the technical side and can advise on the right approach for your design. Email info@workweareast for a quote.
Preparing Layers, Registration Marks, and Black and White Artwork
Registration marks are alignment guides that let the printer line up each colour layer precisely, and they're essential once you're printing more than one colour. Without them, a two-colour logo can end up with the colours shifted out of position.
Build your file with one clearly named layer per colour. Merge overlapping shapes and clean up stray anchor points before separating. Expand strokes and appearance settings so the printer's software can't misread them, and flatten or resolve clipping masks and transparency, which most screen printing workflows can't reproduce directly.
Black and white artwork is the format printers want for the final positives: each colour layer output as a solid black shape on a clear background, used to expose the screen. Clean, high-contrast positives mean a clean screen, and a clean screen means a clean print.
Common Artwork Preparation Pitfalls and How to Avoid Them
Most print failures trace back to file preparation, not the printing itself. Once you can read a failed print backwards to its cause, fixing artwork becomes far quicker.
Reading a failed print back to its file
| What you see on the garment | Likely file cause | The fix |
|---|---|---|
| Blurry, pixelated edges | Low-resolution raster scaled up beyond its native size | Supply vector, or 300 DPI raster at final print size |
| Colours shifted out of alignment | Missing registration marks, or layers not built to a common reference | Add registration marks to every multi-colour file |
| Hairline gaps of bare fabric between colours | No trapping between adjacent colours | Add a small trap so colours overlap slightly |
| Muddy or tinted colour where two inks meet | Accidental overprint instead of a knockout | Knock out the lower colour where the upper sits |
| Fine lines clogged or missing | Line weight too thin for the mesh count | Increase line weight before submitting |
| Unpredictable edges, ghosting, or missing elements | Live transparency, drop shadows, or unexpanded effects | Flatten and expand before sending |
| Ink bleeding beyond the design edge | No bleed allowance, or artwork too close to the edge | Add bleed so minor shifts stay hidden |
| Fonts substituted with the wrong typeface | Text not converted to outlines | Convert all text to outlines |
Why these failures happen
Screen printing is a physical process. Ink is pushed through a mesh stencil, and every stage, exposure, registration, squeegee pressure, flash curing, introduces small variations. Artwork that assumes perfect precision will expose every one.
- Registration drift happens because each colour is printed on a separate pass. Even a fraction of a millimetre of misalignment shows on a two-colour logo; registration marks and trapping absorb that drift.
- Ink bleed occurs when ink spreads slightly beyond the stencil edge, especially on absorbent fabrics or with thin inks. Bleed allowance and spacing between fine details keep it hidden.
- Mesh clogging happens when the stencil opening is too small for ink to pass cleanly. Very fine lines and small text are the usual culprits.
- Halftone dot gain is the tendency of printed dots to appear larger than intended, filling in shadows and losing highlight detail. Designing halftones with slightly lighter midtones compensates.
A note on ink type
Water-based and plastisol inks behave differently, which affects how dense your artwork should be. Water-based inks sit thinner and can look softer, so heavy solid areas may need bolder shapes. Plastisol inks sit on top of the fabric and are more opaque, suiting bold block colour and dark garments. If you know which ink your printer uses, you can tune line weights and halftone density accordingly.
A common mistake is assuming the printer will "sort it out." Reputable shops will flag problems, but fixing them adds time. A pre-flight check before you send artwork avoids the round trip altogether.
If you'd rather leave the technical checks to us, our team at Workwear East reviews artwork before production and can flag issues early. Email info@workweareast for a quote.
Automated Pre-Flight Checklist for Screen Printing Artwork
Run this checklist before every file leaves your desk, it catches most issues that cause reprints and delays.
- File saved as vector (AI, EPS, PDF, SVG) or 300 DPI raster at final print size
- All text converted to outlines so fonts don't substitute
- Colours separated into individual layers, one per ink
- Spot colours specified for brand-critical colours
- Strokes expanded and appearance settings flattened
- Transparency, drop shadows, and clipping masks resolved
- Registration marks added to multi-colour artwork
- Bleed allowance added around the design edge
- Black and white positives checked for clean contrast
- File size compressed sensibly without losing quality
Running this before you send artwork to a print shop saves a round of back-and-forth and protects your deadline.
Conclusion
Preparing artwork correctly is the difference between a print that lasts and one that comes back with problems. If you'd rather not manage separations, DPI settings, and registration marks yourself, Workwear East handles the technical side, with advanced embroidery machines for intricate multi-colour designs, versatile DTF printing for detailed full-colour images, and cost-effective screen printing for larger orders.
Get a quote from Workwear East by emailing info@workweareast for your branded workwear, or visit Workwear East to explore our branded polo shirts and workwear bundles.
Frequently Asked Questions
What file formats are best for screen printing?
Vector files such as AI, EPS, PDF, or SVG are best because they scale without losing quality. If you only have a raster image like a JPEG or PNG, it must be at least 300 DPI at the final print size. Avoid sending Word documents or low-resolution web images, as these often lead to blurry or pixelated prints. Always check with your printer for their preferred format before sending artwork.
How do I handle colour separation for screen printing?
Start by converting your design to CMYK or spot colours, then use your software's separation preview to check each colour channel. For simple designs, manual separation in Illustrator or CorelDRAW works well. For complex artwork with gradients or halftones, use automated tools but review the output carefully. Ensure each colour has its own layer and that registration marks are included to keep colours aligned during printing.
What is the minimum line weight for screen printing?
As a general rule, keep lines at least 0.5 points (about 0.2 mm) thick for standard screen printing. Very fine lines may not reproduce well, especially on textured fabrics. For text, avoid fonts smaller than 6 points. If your design requires thin lines, consider using a higher mesh count screen, which can hold finer details. Always test with a proof before full production.
Why does my artwork need to be in vector format for screen printing?
Vector format uses mathematical paths instead of pixels, so it can be resized to any dimension without losing sharpness. Screen printing requires clean, crisp edges for each colour layer, and vector files provide that. Raster images become pixelated when enlarged, leading to poor print quality. If you only have a raster file, it can be traced to vector, but this may require manual cleanup to ensure smooth lines and accurate colours.