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Processing Options

UV Levels

More levels = finer tonal gradation

Invert (dark = more UV)

Flip grayscale so dark areas glow brightest

Auto-range thresholds

Distribute levels across actual pixel range

Min Pixel Size

Pixelate for registration safety on multi-shot

Gamma

1.0

<1 = darker midtones, >1 = brighter midtones

Blur Radius

0px

Soften edges and reduce noise

Channel Source

Which channel to use for grayscale

Threshold Curve

How thresholds are distributed

Dithering

Add pattern to smooth gradients

Transparent background

Export masks with transparency (recommended for Photoshop)

How It Works

This tool converts a grayscale image into 8 threshold masks. Each mask represents areas receiving that layer of UV ink. Stacking layers creates variable luminescence under blacklight.

Layer 1: Base layer (most coverage)
Layer 8: Highlights only (brightest areas)

Processing image...

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Supports JPG, PNG, WebP, and other common formats

UV Grayscale Processor

Source Image

UV Luminescence Preview Simulated

Individual Masks