Enable EXR Support

OpenCV requires the environment variable OPENCV_IO_ENABLE_OPENEXR to be set to 1 in order to enable OpenEXR read support. Here’s how to set this environment variable on Windows:

Open the System Properties

• Press Windows + R to open the Run prompt.

• Type sysdm.cpl and hit Enter to open System Properties.

Open Environment Variables

• In the “System Properties” window, find and click on the “Advanced” tab.

• Under the “Advanced” tab, click on the “Environment Variables” button. This opens the “Environment Variables” window.

Create a New System Variable

• In the “Environment Variables” window, find the section titled “System variables.”

• Click the “New” button to create a new system variable.

Set Variable Name and Value

• In the new window, under “Variable name,” type: OPENCV_IO_ENABLE_OPENEXR (ensure accuracy).

• In the “Variable value” field, type: 1 (this enables the feature).

Save and Apply Changes

• Click “OK” to close the window after setting the variable name and value.

• You’ll see the new variable listed under “System variables.”

• Click “OK” in the “Environment Variables” window to save the changes.

• Finally, click “OK” in the “System Properties” window to close it.

Check the Add-on Preferences

• Restart Blender and navigate to the add-on preferences.

• If the OpenEXR warning disappears, then you’ve successfully enabled OpenEXR support.