When optimizing a normal map for a 3D model, the best approach balances resolution with the model’s intended use, cleans up noise/artifacts, and tests in the target engine—this preserves detail while keeping performance smooth.
Match resolution to your project’s needs: Higher resolutions work for detailed areas (like character faces) or static renders, but lower resolutions are better for mobile games to reduce file size.
Use texture tools to fix baking issues: Programs like Substance Painter or GIMP can remove jagged edges, excess noise, and other artifacts without losing key surface details.
Test the map in your engine first (e.g., Unity): If the detail feels flat, gradually increase resolution instead of starting with the highest setting—this avoids unnecessary bloat and ensures the map works for your use case.