Cause: a multi-layer OpenEXR without an unnamed RGB layer showed its
first colour layer unless one was named combined / beauty / rgba. A
Blender compositor File Output names the beauty pass "Image", and its
Cryptomatte layers (lowercase r, g, b, a) sort first, so the picture was
CryptoMaterial00.
Fix: the picture is the unnamed RGB layer, else the beauty pass by the
last part of its name (Combined, Beauty, Image, RGBA, RGB, Color), else
the first colour layer that isn't a data pass (Cryptomatte, depth, mist,
normals, vectors, positions, IDs). A layer without R, G and B shows its
own first channel as grey. After Effects shows a file's main RGBA and
leaves the other layers to EXtractoR, which is unchanged.
Tests: exr_channels::layered_exr_shows_the_beauty_pass_not_cryptomatte
(the reported Blender layout, ViewLayer.Combined, no beauty name,
data-only files).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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