SNB to HDR Converter

SNB to HDR — free online Radiance conversion

Drop files here. 1 GB maximum file size or Sign Up
to
Facebook Amazon Microsoft Tesla Nestle Walmart L'Oreal

Radiance-Ready Output

Convert SNB pages to HDR format — the Radiance RGBE standard used in lighting simulation and high dynamic range workflows.

Browser-Based Conversion

No desktop software needed. Open Convertio in any browser, upload your SNB file, and download the HDR result in moments.

Files Auto-Deleted

Uploaded SNB data is removed post-conversion. HDR output files are purged from Convertio servers within 24 hours.

How to convert SNB to HDR

1

Select files from Computer, Google Drive, Dropbox, URL or by dragging it on the page.

2

Choose hdr or any other format you need as a result (more than 200 formats supported)

3

Let the file convert and you can download your hdr file right afterwards

About formats

SNB is a proprietary ebook format developed by Shanghai Nutshell Electronics, a subsidiary of Shanda Interactive Entertainment, for the Bambook e-reader launched in August 2010. The format is structurally based on EPUB principles, packaging HTML content, CSS styling, images, and metadata within a compressed archive, but uses a proprietary container that restricts native playback to Bambook devices and associated software. Shanda designed the Bambook and its SNB ecosystem as an integrated reading platform tied to the Cloudary literature portal (later rebranded as China Literature), one of China's largest online publishing networks hosting millions of web novels and serialized fiction. The format supported reflowable text, chapter navigation, bookmarks, and basic typographic controls suited to Chinese-language content display. One advantage was tight integration with Shanda's massive content catalog, providing readers instant access to an enormous library of Chinese-language literature directly through the device. The Bambook was initially offered at a heavily subsidized price point, using the content ecosystem to drive revenue — a model that preceded similar strategies by other e-reader manufacturers. While the Bambook hardware line was eventually discontinued as the Chinese market shifted toward tablet-based reading apps, SNB files from that era can be converted to standard formats using tools like Calibre with appropriate plugins. The format represents an interesting case study in platform-specific ebook ecosystems within the Chinese digital publishing landscape.
Initial release: August 2010
HDR (also known as RGBE or Radiance HDR) is a high-dynamic-range image format created by Greg Ward Larson as part of the Radiance lighting simulation system, developed at Lawrence Berkeley National Laboratory starting in 1985 with the HDR format emerging around 1989. The format stores floating-point RGB pixel values using a compact 32-bit-per-pixel encoding called RGBE (Red, Green, Blue, Exponent): three 8-bit mantissa bytes share a single 8-bit exponent, representing luminance values across a range of roughly 76 orders of magnitude while keeping file sizes comparable to standard 24-bit images. HDR files begin with a text header containing rendering and exposure metadata, followed by the RGBE pixel data compressed with a scanline-oriented run-length encoding scheme. The format captures the full luminance range of real-world scenes — from deep shadows to direct sunlight — enabling physically accurate lighting calculations, tone mapping to different display conditions, and post-capture exposure adjustment without the clipping artifacts inherent in 8-bit formats. One advantage is the format's foundational role in HDR imaging: Radiance HDR pioneered the concept of storing real-world luminance values in image files, and the .hdr format became the standard for light probe images and environment maps used in image-based lighting across the 3D rendering industry. The format's compact encoding is another practical strength — the RGBE scheme provides far more dynamic range than 8-bit formats while using only 33% more storage per pixel, a favorable tradeoff that made HDR practical on storage-limited systems of the late 1980s. HDR files are supported by Photoshop, GIMP, ImageMagick, Blender, and all major 3D renderers.
Developer: Greg Ward Larson
Initial release: 1989

Frequently Asked Questions

Why convert SNB to HDR?

SNB is limited to Bambook readers. HDR (Radiance RGBE) is used in lighting design and 3D rendering — useful for specialized visual workflows.

What opens HDR files?

Adobe Photoshop, Blender, Luminance HDR, HDRShop, GIMP (with plugins), and 3D rendering applications can open Radiance HDR files.

What makes HDR different?

HDR stores luminance data beyond the standard 8-bit range, capturing a wider spectrum of light intensities in a single image file.

Is HDR suitable for ebook pages?

HDR is specialized for lighting and rendering workflows. For standard viewing, other formats are simpler, but HDR works for niche needs.

Is this a free conversion?

Yes, SNB to HDR conversion is free on Convertio. Premium plans add batch and high-volume processing options.

Can I convert back from HDR?

Convertio supports many conversion directions. You can convert HDR files to other image formats if needed.