Opening Size

Opening Size

Definition: Opening size refers to the measured dimensions of the visible window in a mat or frame through which the artwork is displayed. Typically, the opening is slightly smaller than the actual artwork dimensions to create a secure overlap, holding the artwork in place without adhesives touching the visible surface.

Overview

The opening size is a critical measurement in framing, as it affects both the visual presentation and the security of the artwork. Properly calculated openings ensure that the art is centered, stable, and visually balanced within the frame.

Measurement Considerations

• Artwork Overlap: Usually 1/8" to 1/4" of the artwork edge is overlapped by the mat to prevent slipping and maintain a clean presentation.
• Frame and Mat Precision: Accurate cutting of the mat or frame opening is essential to avoid gaps, misalignment, or visible edges.
• Standard vs. Custom Sizes: While many frames are made to standard sizes, custom opening sizes may be required for irregular or non-standard artwork.

Applications

• Determining the appropriate mat and frame dimensions for artwork.
• Ensuring proper overlap and alignment for prints, photographs, or paintings.
• Coordinating multi-layered mats where each opening must be precise.

Best Practices

• Always measure the artwork at its widest and tallest points before cutting the mat opening.
• Account for slight variations in paper or canvas thickness when planning overlap.
• Use precise tools such as a computerized mat cutter or professional matting tools for clean, straight edges.

Related Terms

• Standard Frames
• Artwork Dimensions
• Stock Sizes
• Paper Size