Controlling the neon outline
The Detail slider controls how the edge detection interprets the image. Lower values create a clean, poster-like neon outline effect by ignoring minor texture. Higher values pick up micro-edges like hair or fabric grain.
The Thickness slider defines the width of the core tube. This scales automatically with the image resolution, ensuring the line remains visible on very large photos.
Shaping the glow
The Glow Radius determines how far the light spreads from the core outline. Intensity dictates the brightness of this halo. If the glow feels too faint, increase Intensity to create a bloom glow around lights in your photo.
Core Opacity controls the visibility of the inner tube. Lowering this value produces a hazy, diffuse look, while a high value keeps the primary neon outline crisp.
Offsetting for depth
The Offset controls shift the entire neon layer relative to the original image. Moving the glow on the X or Y axis creates a neon drop-shadow or a 3D pop effect.
Background Tint and Background Dim darken the original image behind the outline. This isolates the subject, making it an ideal glow effect online tool for building high-contrast thumbnails.