CorelDRAW Scale Factors: Full Size to Print Scale

Working with large-scale projects like signage, vehicle wraps, and billboards in CorelDRAW often requires designing at a reduced ratio rather than full size (1:1) to avoid software canvas limits and excessive file sizes. This guide outlines the exact mathematical scale factors used to convert full-size real-world dimensions into standard scaled drawing formats, details common metric and imperial ratios, and explains how to configure drawing scales inside CorelDRAW for accurate print output.

Understanding the Scale Factor Formula

A scale factor represents the ratio between the design size on your screen and the final physical print size. To scale a full-size object down to a manageable design scale, use the following calculation:

\[\text{Working Dimension} = \text{Full Size Dimension} \times \left(\frac{1}{\text{Scale Ratio}}\right)\]

When sending the scaled design to a print RIP (Raster Image Processor) or wide-format print driver, the operator applies the inverse factor (\(\text{Full Size} = \text{Design Size} \times \text{Scale Ratio}\)) to output the graphic at 100% full scale.

Common Scale Factors for Print

Metric Scales

  • 1:10 Scale (10% of full size):
    • Scale Factor: 0.10 (divide full size by 10).
    • Application: Vehicle wraps, shop fascias, trade show backdrops.
    • Example: A 6000 mm × 2000 mm billboard is designed at 600 mm × 200 mm.
    • Target Image Resolution: 720 to 1500 DPI in the document to output at 72 to 150 DPI.
  • 1:20 Scale (5% of full size):
    • Scale Factor: 0.05 (divide full size by 20).
    • Application: Building wraps, large hoardings, architectural signage.
    • Example: A 20 m × 10 m building graphic is designed at 1000 mm × 500 mm.
  • 1:50 Scale (2% of full size):
    • Scale Factor: 0.02 (divide full size by 50).
    • Application: Super-wide format displays, stadium hoardings.
  • 1:100 Scale (1% of full size):
    • Scale Factor: 0.01 (divide full size by 100).
    • Application: Site plans, large master blueprints.

Imperial Architectural and Engineering Scales

  • Half Scale (1:2 or 50%):
    • Scale Factor: 0.50 (divide full size by 2).
    • Formula: 6" = 1'-0".
  • Quarter Scale (1:4 or 25%):
    • Scale Factor: 0.25 (divide full size by 4).
    • Formula: 3" = 1'-0".
  • Tenth Scale (1:10 or 10%):
    • Scale Factor: 0.10 (divide full size by 10).
    • Formula: 1.2" = 1'-0".
  • Twelfth Scale (1:12 or 8.33%):
    • Scale Factor: 0.0833 (divide full size by 12).
    • Formula: 1" = 1'-0".
  • Forty-Eighth Scale (1:48 or 2.083%):
    • Scale Factor: 0.02083 (divide full size by 48).
    • Formula: 1/4" = 1'-0" (Standard architectural blueprint scale).

Setting the Drawing Scale in CorelDRAW

CorelDRAW allows you to work with real-world dimensions on your rulers while keeping page sizes compact through the Drawing Scale engine:

  1. Double-click the Ruler to open the Document Options dialog box.
  2. Under the Rulers section, click the Edit Scale button.
  3. In the Drawing Scale window:
    • Select a predefined scale ratio from the dropdown list (e.g., 1:10, 1:20, 1/4" = 1'), or
    • Set a custom scale by entering the ratio directly into the Page distance and World distance fields (e.g., set 1.0 mm on the page equal to 10.0 mm in the world).
  4. Click OK, then click OK again to apply the settings.

Once applied, the rulers, dimension tools, and property bar measurements reflect actual full-size measurements, eliminating manual dimension calculations while designing.

Resolution Adjustments for Scaled Artwork

When designing at reduced scales, bitmap image resolutions must be increased proportionally so the output file retains appropriate clarity after enlargement:

  • 1:1 Scale: Create images at 100 to 150 DPI.
  • 1:2 Scale (50%): Create images at 200 to 300 DPI.
  • 1:10 Scale (10%): Create images at 1000 to 1500 DPI.
  • 1:12 Scale (8.33%): Create images at 1200 to 1800 DPI.

When exported to PDF or EPS for final production, provide explicit notation to the print vendor detailing the working scale (e.g., "Artwork created at 1:10 scale; output at 1000%").