Mask blur is the edge-feathering technique that smooths mask boundaries to improve blend transitions during inpainting - it reduces hard seams by creating gradual influence between edited and preserved regions.

What Is Mask blur?

• Definition: Applies blur to mask edges so edit strength tapers instead of changing abruptly.
• Blend Behavior: Soft boundaries help generated textures merge with neighboring pixels.
• Parameterization: Controlled by blur radius or feather width relative to image resolution.
• Use Cases: Common in object removal, skin retouching, and style harmonization edits.

Why Mask blur Matters

• Seam Reduction: Minimizes visible cut lines at mask borders.
• Realism: Improves continuity of lighting and texture near transition zones.
• Error Tolerance: Compensates for slight mask inaccuracies around complex edges.
• Workflow Consistency: Standard feathering presets improve output reliability.
• Overblur Risk: Excessive blur can weaken edit specificity and alter protected content.

How It Is Used in Practice

• Radius Scaling: Set blur radius proportional to object size and output resolution.
• A/B Comparison: Compare hard and soft masks on the same seed for boundary diagnostics.
• Task Presets: Use tighter blur for precise replacement and wider blur for texture cleanup.

Mask blur is a core boundary-smoothing tool for local generative edits - mask blur should be tuned to scene scale so blending improves without losing edit control.