In an OpenEXR handed to compositing, how are layers, parts and channel names defined, and what does Blender's writer do when it writes single-part layers versus multipart?
OpenEXR names layered channels L.C (nestable) without any stacking or compositing meaning; multipart parts need unique names (dots allowed) and may differ in compression and data window and mix deep and flat. Blender v5.2.2 writes either single-part channels layerpass.view.C or, in multipart mode, one part named layerpass-view with channels layerpass.C.
OpenEXR names layered channels L.C (nestable) without any stacking or compositing meaning; multipart parts need unique names (dots allowed) and may differ in compression and data window and mix deep and flat. Blender v5.2.2 writes either single-part channels layerpass.view.C or, in multipart mode, one part named layerpass-view with channels layerpass.C.
Curator qualifications: Code and docs read 2026-10-22; nothing rendered or written. exrmultipart tool page (S29) not re-read.
Limitations: Code and docs read 2026-10-22; nothing rendered or written.
Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.
Structured fields
{
"citations": [
{
"url": "https://github.com/AcademySoftwareFoundation/openexr/blob/69b2604fc76e370615438bdc8d2cd95b9349c12e/website/TechnicalIntroduction.rst",
"note": "OpenEXR website/TechnicalIntroduction.rst at 69b2604f (raw), Channel Names; multi-part header attributes; blender imbuf/intern/openexr/openexr_api.cpp at d13f752e (raw), IMB_exr_add_channels"
},
{
"url": "https://github.com/AcademySoftwareFoundation/openexr/blob/69b2604fc76e370615438bdc8d2cd95b9349c12e/website/bin/exrmultipart.rst",
"note": "OpenEXR website/TechnicalIntroduction.rst at 69b2604f (raw), Channel Names; multi-part header attributes; blender imbuf/intern/openexr/openexr_api.cpp at d13f752e (raw), IMB_exr_add_channels"
},
{
"url": "https://github.com/blender/blender/blob/d13f752e3b9c4f8c261cda552b1021f8bcc0382c/source/blender/imbuf/intern/openexr/openexr_api.cpp",
"note": "OpenEXR website/TechnicalIntroduction.rst at 69b2604f (raw), Channel Names; multi-part header attributes; blender imbuf/intern/openexr/openexr_api.cpp at d13f752e (raw), IMB_exr_add_channels"
}
]
}Evidence claims
- [sourced_fact] OpenEXR names layered channels L.C (nestable) without any stacking or compositing meaning; multipart parts need unique names (dots allowed) and may differ in compression and data window and mix deep and flat. Blender v5.2.2 writes either single-part channels layerpass.view.C or, in multipart mode, one part named layerpass-view with channels layerpass.C. · locator: OpenEXR website/TechnicalIntroduction.rst at 69b2604f (raw), Channel Names; multi-part header attributes; blender imbuf/intern/openexr/openexr_api.cpp at d13f752e (raw), IMB_exr_add_channels source
Rights
| component | license | hosting | redistribution | modification | training | Evidence and notes |
|---|---|---|---|---|---|---|
| documentation | unknown | permitted | permitted | unknown | unknown | Applies to this original summary only, not to the cited sources. |
Linked records
- cites → https://github.com/AcademySoftwareFoundation/openexr/blob/69b2604fc76e370615438bdc8d2cd95b9349c12e/website/TechnicalIntroduction.rst
- cites → https://github.com/AcademySoftwareFoundation/openexr/blob/69b2604fc76e370615438bdc8d2cd95b9349c12e/website/bin/exrmultipart.rst
- cites → https://github.com/blender/blender/blob/d13f752e3b9c4f8c261cda552b1021f8bcc0382c/source/blender/imbuf/intern/openexr/openexr_api.cpp