A RAW file is not a finished image. It’s sensor data that must be processed before you can view or edit it normally, so different converters can produce different results.

Key differences include how software handles:

• demosaicing/interpolation of Bayer sensor data
• white balance and color temperature
• color rendering and tone curves
• noise reduction
• hot-pixel removal
• mapping higher-bit sensor data into 8- or 16-bit output

Because there’s no single “correct” interpretation, each converter uses its own algorithms and defaults. That’s why the same RAW file can look different across programs.

Built-in or simple converters are usually faster and more convenient, but often offer less control. External RAW converters typically give finer control over the conversion process and image quality.

Manufacturer software may aim to match the camera maker’s intended look more closely, while third-party converters may offer different rendering, tools, or workflow advantages.

In short: RAW conversion is not just opening a file format. It’s image processing, and the converter’s choices strongly affect the final image.