3.5. One Scene – many images


Taking one Blender rendering and view it through many view transforms in SDR and HDR.

For the article 1.4.2. Blender 3.2 render colorspace overrides I set up a small Blender scene. At the same time I re-checked the CG OCIOv2 config and I thought: Why not comparing all the latest display rendering transforms or view transforms are are easily available and see what images come out of them.

This time I rendered another closeup of that scene. To make the camera move a bit more interesting I tested the Blender AddOn VirtuCamera and recorded the hand held camera animation live with an iPhone13Pro.

The scene specs:
The scene contains a linear_sRGB balanced HDRI, a sRGB-tagged .jpg file texture from Scaniverse, three RGB spheres with a RGB base color of 0.8 or 80% reflectance of the incoming light, a chrome ball and a sRGB color checker. The EXR render output is balanced and exposure adjusted in Nuke for the sRGB JPG output so that the middle grey patch has a value of approx 0.39 or RGB 100/100/100 on this page.


The EXR file that comes out of Blender contains image data, but it is not really an image yet. It contains pixel values over 9000 in the center of the sun for example.

A display can only decode values between 0-1, so there is some image processing (tone-mapping) and encoding for the display (inverse EOTF) needed in order to present an “expected” image out of the data.

I setup up the Blender scene while I had the standard sRGB view transform enabled, so you can say the first image is the intended version of the rendering. All the other following images are “interpretations” of the same blender “scene”. Pick your favourite image.

Standard sRGB, Blender Filmic, AgX, OpenDRT and T-Cam

AcesCentral.com ODT-vWG – ACES 1.2 Rec.709, Candidate a,B,C

I am attending the virtual working group meetings for the next ACES 2.0 release on ACESCentral.com for about a year now. A test package with three candidates is now available on ACESCentral.com. The following images are created in Nuke with a preview version of this test package.


this was SDR, now its time for some HDR

The best way to view the HDR content is with the YouTube or Vimeo app directly on a device that supports HDR.

The moment I uploaded the content on any platform I am not able to follow their compression and encoding processing. I can only hope that I will be able to see the same clip that I saw on my display.

A small 5 seconds clip showing 5 different HDR DRT’s.
The same source file uploaded on Vimeo.