print-shop-canvas-skilllisted

# Print Shop Canvas Engine Skill Design guide for generating physical print-ready documents (warranty cards, service tickets, component bin labels, dynamic calendars) with millimeter dimensional accuracy, 300 DPI resolution, and bleed margins for industrial cutter blades. --- ## 1. Screen Displays vs Physical Press Specifications - **Screen Displays (Web/UI)**: Operate on pixels (typically 72-96 DPI) in RGB color space. - **Physical Offset / Digital Press**: - Exact dimensions measured in millimeters (mm). - Minimum visual sharpness standard: **300 DPI** (Dots Per Inch). - Requires perimeter bleed margins (+3mm on all outer edges) to prevent unprinted white borders during mechanical guillotine cutting. --- ## 2. Pillow High-DPI Coordinate Calculations Millimeter-to-pixel conversion at 300 DPI: $$\text{Pixels} = \frac{\text{mm} \times 300}{25.4}$$ ```python from PIL import Image, ImageDraw def mm_to_px(mm: float, dpi: int = 300) -> int: return int((mm * dpi) / 25.4) # Example: Repair Bench Warranty Card (90mm x 54mm) + 3mm Bleed per edge WIDTH_MM = 90 + 6 HEIGHT_MM = 54 + 6 canvas_w = mm_to_px(WIDTH_MM) canvas_h = mm_to_px(HEIGHT_MM) # Instantiate high-resolution white canvas (300 DPI RGB) img = Image.new("RGB", (canvas_w, canvas_h), color=(255, 255, 255)) draw = ImageDraw.Draw(img) # Outline safe cutting margin (5mm inside trim line) safe_margin = mm_to_px(5) draw.rectangle( [safe_margin, safe_margin, canvas_w - safe_margin, canvas_h - safe_margin],