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.

   .. image:: images/exr_run.webp
    :width: 400
    :alt: Add-on Panel

**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.

   .. image:: images/exr_sys_props.webp
    :width: 400
    :alt: Add-on Panel

**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.

   .. image:: images/exr_add_var.webp
    :width: 400
    :alt: Add-on Panel

**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).

   .. image:: images/exr_new_var.webp
    :width: 400
    :alt: Add-on Panel

**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.