Fix #32603: Multi-Layer EXR files can't be color managed

Issue was caused by completely different way how multi-layer EXRs are loading,
they're bypassing general image buffer loading functions.

Solved by running color space transformation on render result construction
from multi-layer EXR image.

Also fixed issue with wrong display buffer computing for buffers with less
than 4 channels. Issues were:

- Display buffer is always expected to be RGBA
- OpenColorIO can not apply color space transformations on non-{RGB, RGBA}
  pixels.

1 files changed, 3 insertions, 1 deletions

diff --git a/source/blender/blenkernel/intern/image.c b/source/blender/blenkernel/intern/image.c
index 7146c48cd2f..b0fdbba2aa9 100644
--- a/source/blender/blenkernel/intern/image.c
+++ b/source/blender/blenkernel/intern/image.c
@@ -2213,8 +2213,10 @@ void BKE_image_backup_render(Scene *scene, Image *ima)
 /* in that case we have to build a render-result */
 static void image_create_multilayer(Image *ima, ImBuf *ibuf, int framenr)
 {
+	const char *colorspace = ima->colorspace_settings.name;
+	int predivide = ima->flag & IMA_CM_PREDIVIDE;
 
-	ima->rr = RE_MultilayerConvert(ibuf->userdata, ibuf->x, ibuf->y);
+	ima->rr = RE_MultilayerConvert(ibuf->userdata, colorspace, predivide, ibuf->x, ibuf->y);
 
 #ifdef WITH_OPENEXR
 	IMB_exr_close(ibuf->userdata);