Dynapik offers a free online tool to change image types - no need to download anything. It's quick and easy to use. You can change your NRW images to HDR format. This tool works for both professionals and casual users. Convert your images to HDR in seconds.
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Nikon Coolpix RAW
The raw format for Nikon's compact cameras.
NRW is a variation of the Nikon Electronic Format (NEF) designed specifically for high-end Coolpix compact cameras (like the P7000 series). While structurally similar to NEF, Nikon treats it as a distinct format to differentiate the consumer/compact line from the DSLR/Mirrorless line (which uses NEF).
NRW files typically contain 12-bit sensor data. They support many of the same features as NEF, including non-destructive editing of white balance and exposure, though they may lack some of the deeper custom metadata found in pro DSLRs.
Introduced to bring raw capabilities to advanced point-and-shoots without diluting the 'pro' NEF brand.
Radiance HDR
The pioneering high dynamic range format for lighting simulation.
The Radiance HDR format (often called RGBE) is a raster image format designed for storing high dynamic range (HDR) data. Rather than standard 8-bit integers, it uses a specialized encoding where pixel colors are stored as Red, Green, and Blue mantissas sharing a single common Exponent (RGBE). This allows it to represent a vast range of luminance values, from direct sunlight to deep shadows, in a relatively compact 32-bit-per-pixel format.
The .hdr format consists of a human-readable header containing variables like exposure and gamma, followed by binary pixel data. The pixel data typically uses the 'Radiance RGBE' encoding. Each pixel is 4 bytes: one byte each for Red, Green, and Blue, and one shared Exponent byte. This 'shared exponent' scheme is efficient but introduces some limitations—if one channel is very bright and another is very dark in the same pixel, color precision can be lost (color banding).
Developed by Greg Ward in the late 1980s for the Radiance lighting simulation system. It was one of the first formats to enable practical HDR storage and became a de facto standard in the CGI industry for Image-Based Lighting (IBL).
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