An EXR viewer for real production files

What makes this different

• Cryptomatte click-to-pin

  Click an object on the canvas, get the matte name resolved from the manifest (not a hash). Pin it, isolate it in the viewport to sanity-check coverage, export as PGM into Nuke or After Effects. Most browser EXR viewers can't read the manifest at all.

• Color Trust panel

  File Info and Diagnostics drawers both show a pass / needs-attention readout on the active display path (source interpretation, view, tone map). When something's off, the failing sample gets called out instead of buried.

• Fixture self-check, in your browser

  Diagnostics runs the bundled official OpenEXR fixtures through this build, in your browser, and shows a Fixture / Decode / Remap / Path / Limitation table. You're seeing the actual codec and file-shape health of the viewer right now, not a static support promise.

What it decodes

• Compressions

  NO, RLE, ZIPS, ZIP, PIZ, PXR24, DWAA, DWAB. Eight of the nine official EXR codecs. B44/B44A are detected but not decoded yet.

• File shapes

  Single-part multilayer, multipart, beauty plus AOV groups, Cryptomatte with manifest parsing.

• Renderers

  Tested against real output from Blender, Houdini, Nuke, Maya, V-Ray, Arnold, RenderMan.

Open a file

Three ways, all on the left of the top bar.

• Sample

  Loads a bundled multilayer EXR. Quickest way to confirm the viewer's working before you point it at your own files.

• Open

  Standard file picker. Accepts .exr.

• Drag and drop

  Drop an EXR anywhere on the page. A drop target shows up while you drag. Other file types get ignored with a status message.

Image controls

Right side of the top bar. Four dropdowns that change what you see.

• Source

  How to interpret the file's color space. Auto-detects from the header by default. Override when the header lies.

• View

  Tone mapping applied on the GPU before pixels hit the canvas. ACES-like, Reinhard, or linear clamp.

• Channel

  What the canvas shows. Composite Color, individual R / G / B, Alpha, Luma, or Hash Color (mostly for Cryptomatte inspection).

• Group

  Which layer or AOV group inside the file. Multilayer EXRs surface their parts here (beauty, diffuse, specular, depth, etc).

Multipart files also surface a Part dropdown to switch between parts (left/right stereo, named beauty/AOV groups).

For files with a Cryptomatte manifest, click-to-pin works in Inspect mode. Pick a CryptoObject or CryptoMaterial layer in Group, then click an object. The Pixel Inspector resolves the matte name from the manifest and gives you a Pin button. Once a matte's pinned, the Isolate in viewport toggle dims everything outside it so you can sanity-check coverage on the actual frame, not just a thumbnail. Pinned mattes export as PGM. Drop them into Nuke or After Effects.

The Pixel Inspector

Switch to Inspect mode and click any pixel. You see the whole color chain (raw scene-linear values, the tone-mapped display, the interpretation path), not just RGB.

• Raw: scene-linear RGBA straight from decode.
• Luma: derived luminance.
• Display: the same pixel after the chosen View tone-map.
• Path: the interpretation chain (e.g. Raw / data / sRGB monitor → Raw tech-check).
• Channels: which source channels the values came from (e.g. ViewLayer.Combined.r, .g, .b, .a).

The status bar

Below the canvas, left to right: Navigate / Inspect mode toggles for canvas interaction, the file name and dimensions, Exp and Gamma sliders for display adjustment, plus File Info and Diagnostics drawers. The Color Trust panel and fixture self-check both live in those drawers (see above).