Troubleshooting

• pkg-config: OpenEXR not found during make:
• install OpenEXR development packages + pkg-config
• ex1-postprocess reads image but output fails:
• verify you built with Makefile OpenEXR flags if writing .exr
• Unexpected output / heavy runtime:
• reduce -s (samples multiplier) and -p (lambda passes)
• use lower polynomial degree -c