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 WEBP images to HDR format. This tool works for both professionals and casual users. Convert your images to HDR in seconds.
WebP
Google's versatile format that does it all—transparency, animation, and superior compression.
WebP is a modern image format developed by Google specifically to speed up the web. It is a 'swiss army knife' format that combines the best features of JPEG (lossy compression), PNG (lossless compression and transparency), and GIF (animation) into a single, efficient package. WebP lossless images are typically 26% smaller than PNGs, while WebP lossy images are 25-34% smaller than comparable JPEGs. This significant size reduction helps websites load faster and consume less bandwidth, which is why it is strongly recommended by Google's PageSpeed Insights. After years of partial browser support, WebP is now universally supported across all modern browsers (Chrome, Firefox, Safari, Edge), making it the default choice for delivering optimized images on the web today.
WebP is based on the VP8 video codec (part of the WebM project). **Lossy WebP** uses predictive coding to encode an image, similar to how video keyframes are compressed. It predicts the values of pixels based on their neighbors and only encodes the difference (residual). It operates in the YUV color space. **Lossless WebP** uses advanced techniques like dedicated entropy codes for different color channels, 2D locality of backward reference distances, and a color cache of recently used colors. It operates in the RGBA color space. Uniquely, WebP supports 'lossy with transparency'—a feature JPEG lacks. This allows for transparent images that are significantly smaller than PNGs by applying lossy compression to the RGB channels while keeping the alpha channel sharp (or compressed).
Google announced WebP in September 2010 as a new open standard for lossy true-color graphics. It was derived from the VP8 video codec technology Google acquired from On2 Technologies. In 2011, Google extended the format to support lossless compression, transparency (alpha channel), and animation, effectively positioning it as a replacement for JPEG, PNG, and GIF simultaneously. Adoption was initially slow outside of the Chrome ecosystem. Firefox added support in 2019, and the final major holdout, Apple's Safari, added support in September 2020 (iOS 14 / macOS Big Sur). This universal support marked the turning point where WebP became safe to use as a primary format.
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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