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v1.0.1 - LTX HDR to ACEScg EXR, colorspace in filename, EXR compression

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@SlavaSexton SlavaSexton released this 01 Jul 08:30
v1.0.1
9ed0856

LTX-2.3 HDR to ACEScg EXR - both wiring methods on one graph

Adds first-class support for writing LTX-2.3's HDR output as a color-managed ACEScg EXR sequence, plus filename and compression control.

Added

  • Write LTX-2.3 SDR-to-HDR as an ACEScg EXR sequence. auto_colorspace on OCIO Write: when it is wired from LTX's LTXVHDRDecodePostprocess, it auto-sets from_colorspace = Linear Rec.709 (sRGB) and output_colorspace = ACEScg, so the LTX HDR path just works. Two wiring methods documented in the README (use LTX's decoder, or do the LogC3 decode on this pack).
  • ARRI LogC3 (EI800) curve in OCIO LogConvert. The exact tone curve LTX-2's HDR IC-LoRA uses. Round-trips to float precision and matches LTX's own decode, so you can decode a LogC3 plate here (keeping Rec.709 primaries) instead of the config's "ARRI LogC3" (which would shift the gamut).
  • Colorspace in the output filename. colorspace_in_name on OCIO Write puts the output colorspace before the frame number: name_acescg.0001.exr. Short curated tags (srgb / rec709 / logc / clog / acescg).
  • Nuke-style EXR compression choice. compression dropdown on OCIO Write: zip / zips / piz / pxr24 / dwaa / dwab / rle / none (default zip).

Verified on live ComfyUI 0.25.1: real LTXVHDRDecodePostprocess.hdr_linear -> OCIO Write, two-frame ACEScg EXR, HDR values (well above 1.0) preserved; every compression option confirmed via the EXR header; the LogC3 curve round-trips and matches LTX's decode.

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