DPI for Screen Printing — What Resolution Your Artwork Needs

Why Screen Printing DPI Differs from Photo Printing

Photo inkjet printing deposits microscopic droplets — typically 1,440 DPI — producing continuous-tone output. Screen printing forces ink through a physical mesh screen, producing halftone dot patterns. These two reproduction methods have fundamentally different DPI requirements.

Physical mesh screens have fixed thread counts. Garment printing typically uses 110–160 mesh (threads per inch). Halftone dots are larger than inkjet droplets — the minimum printable dot is 3–5% at 55 LPI. The standard rule: artwork DPI must be at least 2× the LPI. At 55 LPI: 110 DPI is the minimum; 300 DPI is the industry standard that provides adequate safety margin.

• Spot color (solid fills): 300 DPI raster, or vector (no DPI limitation)
• Simulated process (photorealistic halftone): 300 DPI minimum, 450–600 DPI preferred
• Vector artwork (AI/EPS): infinitely scalable — no DPI limitation applies

DPI by Screen Print Type

Screen printing encompasses several distinct techniques. Each has different DPI requirements based on the halftone method used.

• Spot color (solid fills): 300 DPI raster or vector — the most forgiving technique
• Simulated process (photorealistic): 300 DPI minimum, 450–600 DPI preferred for fine detail
• Index printing (pixel grid, no halftones): 150–200 DPI — intentionally pixelated aesthetic
• Discharge printing (removes shirt dye): 300 DPI spot color only — no photorealistic capability
• DTG — direct to garment (inkjet, not screen): 300–1200 DPI; higher DPI improves fine detail

DTG printing is inkjet-based and not true screen printing. DTG accepts 300–1200 DPI artwork and produces photographic quality — the DPI requirements are closer to photo printing than traditional screen printing.

Best File Formats for Screen Printing

File format directly affects how the print shop separates colors and burns screens. Submitting the wrong format delays production and may produce incorrect color separations.

• Vector AI/EPS: the preferred format for spot color — scalable, no rasterization required
• Layered PSD at 300 DPI: the standard for simulated process color separations
• PDF with outlined fonts: accepted by most shops; embed all images at 300 DPI within the PDF
• JPEG: never use for spot color — compression artifacts create halos and ghost edges around fills

Always outline fonts in Illustrator (Type → Create Outlines) before submitting AI or EPS files. Font substitution on the print shop system changes letterforms and spacing — outlined fonts eliminate this risk entirely.

Color Separation for Screen Printing

Each spot color in a screen print design requires a separate physical screen. A 6-color design uses 6 screens — each exposed, coated, and washed individually. Color count directly determines job cost and press setup time.

• Each spot color = one screen; typical jobs use 4–8 colors
• Underbase white = an additional screen required for printing on dark garments
• Provide a layered PSD or AI file for best separation results — do not flatten
• Specify PMS (Pantone) colors by number if exact color matching is required

Simulated process printing uses halftone dots of CMYK plus spot colors to simulate photographic images with a limited screen count. 4–6 screens can reproduce thousands of apparent colors through halftone mixing.

How to Check Artwork Meets Screen Print Requirements

Verify artwork before submitting to avoid file rejection and reproof fees.

• Raster files: use the DPI calculator to confirm pixel count equals 300 DPI × print dimensions
• Vector files: no DPI check needed — verify all strokes are above 0.25 pt minimum (hairlines disappear on press)
• Zoom to 100% in Photoshop — visible pixels at screen size will be visible in the final print
• Check for stray pixels and anti-aliasing on spot color art — clean, hard edges are required for clean screens

Anti-aliasing adds semi-transparent pixels around edges for smooth screen rendering. These semi-transparent pixels become 10–30% halftone dots on the screen — producing a visible halo around spot color fills. Flatten and threshold spot color layers to binary (0% or 100%) before submitting.

For related sublimation printing resolution guidance, see the guide on DPI for sublimation printing.