Free Perler Bead Pattern Maker – Photo to Fuse Bead Pattern

• Brand Reference Palettes: Match images against built-in screen-color references for Perler, Artkal, Hama, and MARD. Codes and colors are practical estimates, so verify them against your physical beads before purchasing.
• CIEDE2000 Perceptual Color Matching: Advanced CIE-Lab* space $\Delta E_{2000}$ color distance algorithm eliminates graying and color distortion.
• Dithering & Color Limits: Built-in Floyd-Steinberg and Atkinson error diffusion algorithms with customizable maximum color limits (8 to unlimited).
• Interactive Pattern Editor: Pan and zoom (50%–800%), pencil drawing, eraser, bucket flood-fill, eyedropper, and single-click full pattern color replacement.
• 1:1 Scale Printable PDF Export: Automatic pagination for 29×29 and 58×58 pegboards with true 14.5cm scale, letting you place transparent pegboards directly on the printed sheet.
• Smart Bead Count & Shopping List: Real-time calculation of total bead count, breakdown by color code and name, with CSV/PDF shopping list export.
• 100% Client-Side Privacy: All image rendering, quantization, and PDF generation occur directly in your browser. No photos are ever uploaded to any server.

The generator uses a specialized multi-phase pipeline designed for plastic fuse bead crafting:

1. Perceptual Color Space Conversion: Standard RGB Euclidean distance fails to account for human non-linear color perception, leading to dull or mismatched plastic bead tones. We convert sRGB coordinates to the CIE-Lab* color space:
   $$X_{rel} = f(R, G, B), \quad Y_{rel} = f(R, G, B), \quad Z_{rel} = f(R, G, B)$$
   $$\Delta E_{2000} = \sqrt{\left(\frac{\Delta L'}{k_L S_L}\right)^2 + \left(\frac{\Delta C'}{k_C S_C}\right)^2 + \left(\frac{\Delta H'}{k_H S_H}\right)^2 + R_T \left(\frac{\Delta C'}{k_C S_C}\right)\left(\frac{\Delta H'}{k_H S_H}\right)}$$
2. Multi-Step Stepped Downsampling & Sharpening: Unlike simple single-step bilinear filtering that turns lineart into muddy grey, stepped halving downsampling preserves sharp black contours, intense crimson hair, and vibrant golden eye highlights.
3. 1:1 Printable Geometry: Standard Midi fuse beads have a physical diameter of $5.0\text{mm}$. A standard $29 \times 29$ square pegboard measures exactly $145\text{mm} \times 145\text{mm}$. The PDF engine calculates millimeter margins on DIN A4 pages $(210\text{mm} \times 297\text{mm})$ to ensure transparent pegboard overlays align with millimeter precision.