Convert Radiance RGBE (.hdr, .pic) high dynamic range environment maps and lighting textures to standard viewable 32-bit RGBA PNG images directly in your browser. 100% private client-side tone mapping with zero server uploads.
Detailed side-by-side format architecture for HDR Graphic Raster (.hdr) and Portable Network Graphics (.png). Every conversion executes strictly within isolated browser memory without network transit.
Drag and drop your .hdr file onto the working surface or use the system file dialog. File magic bytes are verified locally on device.
Select a quality preset (Lossless, Visually Lossless, Balanced, Smallest) or adjust advanced encoding switches in the options panel.
Click CONVERT to execute local WebAssembly compilation. Save the finished .png directly to local storage, or stage it for chaining.
Prefer local shell scripting? Run this standard POSIX command on your machine to achieve equivalent transcoding without a web interface:
# Convert HDR to PNG locally
magick input.hdr output.pngWorking with files across multiple web pages? The official convrtr Chrome Extension adds native Side Panel docking, right-click context menu media extraction, and visible viewport capture. Powered by the same zero-upload client-side WebAssembly engine.
A technical comparison between Greg Ward's Radiance HDR (.hdr / RGBE) and ILM's OpenEXR (.exr). Explore shared exponents, half-float pixels, multi-layer rendering, and tone mapping.
Detailed technical comparison between PNG and JPG (JPEG). Understand lossless vs lossy compression, alpha channel transparency, and file size optimization.
Compare WebP and PNG file sizes, transparency handling, browser support, and compression performance for web graphics and illustrations.
Radiance HDR (also known as RGBE) is a high dynamic range raster image format developed by Greg Ward at Lawrence Berkeley National Laboratory. It stores 32 bits per pixel (8 bits each for red, green, blue, and a shared common exponent), allowing scenes with extreme contrast ratios such as 360-degree environment skyboxes, game lighting, and scientific simulations.
Standard photo viewers, websites, smartphones, and graphic software often cannot display floating-point HDR files directly. Converting to PNG applies Reinhard tone mapping and standard sRGB gamma correction, producing a rich, clear 8-bit per channel image viewable on any device.
The converter decodes adaptive run-length encoded (RLE) RGBE scanlines into linear radiometric floating-point values, scales them by exposure, passes them through a Reinhard tone reproduction operator (L / (1 + L)), and maps the values through an sRGB gamma 2.2 transfer curve into standard 8-bit color channels.
Never. All decoding, floating-point math, tone mapping, and PNG chunk generation happen 100% in your local browser using pure WebAssembly and TypeScript. Your files never leave your computer.
HDR Graphic Raster (HDR) and Portable Network Graphics (PNG) serve distinct roles across the digital workflow. Converting to PNG provides optimized compatibility, modern compression efficiency, or standardized playback across web browsers, operating systems, and media production environments.
The output format (PNG) is inherently lossless or supports lossless operation. Your original visual or audio fidelity is mathematically preserved without quantization artifacts.
Never. convrtr is architected with a strict zero-upload model. All processing, decoding, decompression, and encoding happen 100% locally on your machine using sandboxed WebAssembly and Web Workers. Your data never touches an external server, database, or analytics collector.
You can execute this conversion locally via command-line utilities such as ffmpeg, cwebp, or ImageMagick. For example: see the developer terminal recipe provided in the technical specifications dossier above. convrtr provides the identical local-first capability directly inside your browser without installing CLI packages.
Yes. You can drop multiple .hdr files into the instrument to process them concurrently in browser Web Workers, or click 'Open in Master Studio' to queue mixed formats, configure individual targets, and export as a single ZIP archive.
Explore Greg Ward's Radiance 32-bit RGBE (.hdr) architecture. Learn how shared exponents, adaptive RLE scanlines, Reinhard tone reproduction, and sRGB gamma curves decode in browser memory.
Discover Fabrice Bellard's Better Portable Graphics (.bpg) format. Learn how HEVC intra-frame compression, LEB128 variable headers, and YCbCr color spaces convert to standard PNG.
Explore Sony's early SRF camera raw format. Learn how TIFF Image File Directory structures and embedded JPEG preview streams convert into 32-bit RGBA PNG graphics.