Radiance Viewer Manual - FXTD Studio Radiance

📖 Overview

The Radiance Pro Viewer brings professional image analysis tools from industry applications like Autodesk Flame, Foundry Nuke, and DaVinci Resolve directly into ComfyUI.

🔍 Interactive Navigation

Smooth zoom and pan with mouse wheel and drag gestures.

📊 Professional Scopes

Real-time Histogram, Waveform, and Vectorscope analysis.

🎨 Exposure Controls

Adjust display EV and gamma for evaluating HDR content.

🚨 False Color & Zebra

ARRI-style exposure visualization and clipping detection.

↔️ A/B Comparison

Wipe and difference modes for comparing versions.

📺 Fullscreen Mode

Expand viewer to full screen for detailed inspection.

🚀 Getting Started

Adding the Node

Search for Radiance Viewer in the ComfyUI node menu, or navigate to FXTD STUDIO → Radiance → Viewer.

First Steps

Scroll	Zoom in/out towards cursor
Shift + Drag	Pan around the image
Press F	Fit image to view
Press 1	100% zoom (1:1 pixels)
Click	Sample color values

🖥️ Interface Layout

Click image to view in full quality

⌨️ Keyboard Shortcuts

F Fit to View

1 100% Zoom

R Red Channel

G Green Channel

B Blue Channel

L Luminance

C Color (RGB)

H Histogram

W Waveform

V Vectorscope

E False Color

Z Zebra Pattern

A A/B Compare

D Annotate

? Help Overlay

F11 Fullscreen

T Save Snapshot

📊 Professional Scopes

Histogram (H)

Shows the distribution of pixel values across the tonal range. Watch for:

Clipping at edges = lost detail in shadows/highlights
Gaps in histogram = posterization
Bunching = low contrast

Waveform (W)

Displays luminance distribution across the horizontal axis of the image. Vertical position indicates brightness level (0-100%).

💡 Pro Tip

If pixels touch the top of the waveform, highlights are clipping. If they touch the bottom, shadows are crushed.

Vectorscope (V)

Shows color hue (angle) and saturation (distance from center). Useful for checking skin tones and color balance.

🎨 False Color Analysis (E)

ARRI-style exposure visualization shows luminance levels as distinct colors:

Purple — <1% Crushed blacks

Blue — 1-8% Underexposed

Cyan — 8-16% Dark shadows

Grey — ~18% Middle grey

Green — 18-35% Optimal

Yellow — 35-55% Bright

Orange — 55-75% Hot

Red — 75-95% Very hot

Magenta — >95% Clipped

💡 Usage

Target skin tones in the green/yellow zone. Avoid magenta (clipped) unless intentional for creative effect.

↔️ A/B Comparison

Wipe Mode

Press A to enable split-screen comparison. Drag the divider to compare two images side-by-side.

Difference Mode

Press A again for difference view (5x amplified). Bright areas indicate differences, black indicates identical pixels.

Mode	Description
Wipe	Draggable split-screen comparison
Difference	Highlights pixel differences (5x amplified)

🏆 Industry Comparison

Feature	Radiance Pro	Flame	Nuke
Zoom/Pan	✓	✓	✓
Exposure Control	✓	✓	✓
Histogram	✓	✓	✓
Waveform	✓	✓	✓
Vectorscope	✓	✓	✓
False Color	✓	✓	✓
Zebra Pattern	✓	✓	Plugin
A/B Compare	✓	✓	✓
Color Picker	✓	✓	✓

🔧 Troubleshooting

Viewer not appearing?

Restart ComfyUI to load the JavaScript extension
Check browser console for errors (F12)
Verify js/radiance_viewer.js exists

Scopes not updating?

Scopes update when the image changes
Toggle scope off/on to force refresh

Performance issues?

Reduce preview image size
Disable vectorscope (most intensive)
Close other scope panels