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Convert HDR to WBMP - High Dynamic Range to Monochrome

Transform Radiance HDR images into simple black-and-white wireless bitmap format.

Step 1: Upload your files

You can also Drag and drop files.

Step 2: Choose format
Step 3: Convert files

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Why Convert HDR to WBMP?

HDR files store high dynamic range image data with floating-point precision, capturing far more brightness levels than standard images. WBMP is the exact opposite-a 1-bit monochrome format designed for legacy wireless devices. Converting between them might seem unusual, but specific workflows require this transformation.

When you need silhouette extraction, threshold-based artwork, or compatibility with ultra-constrained systems, converting HDR to WBMP strips away all color and tonal complexity to produce clean black-and-white output.

How to Convert HDR to WBMP

  1. Upload your HDR file - Drag and drop or select your Radiance HDR image
  2. Select WBMP as output - Choose the wireless bitmap format from available options
  3. Download your file - Get your monochrome WBMP image instantly

The entire conversion happens in your browser. No software installation required.

Understanding the Conversion

HDR (High Dynamic Range) images use the RGBE format developed by Gregory Ward for the Radiance rendering system. Each pixel stores RGB values plus a shared exponent, allowing representation of brightness levels from deep shadows to bright highlights-far exceeding what monitors can display.

WBMP (Wireless Application Protocol Bitmap) is radically simpler. Each pixel is either black (0) or white (1). No grayscale, no color, no compression. In our testing, a 2MB HDR file converts to a WBMP under 50KB because you're going from 32-bit floating-point color to 1-bit monochrome.

During conversion, the HDR's extensive tonal range gets threshold-mapped. Pixels above a certain brightness become white; those below become black. This creates a high-contrast binary representation of your original image.

When This Conversion Makes Sense

Silhouette Extraction

HDR images from 3D rendering often have perfect lighting information. Converting to WBMP extracts clean silhouettes-useful for masks, stencils, or graphic design elements.

Legacy System Compatibility

Some industrial or embedded systems still use WBMP for display. If your source material exists only as HDR renders, this conversion bridges the gap.

Artistic Effects

The extreme contrast of monochrome output creates stark, graphic artwork from detailed HDR photography or renders.

File Size Reduction

When you only need shape information-not color or shading-WBMP's tiny file size makes sense for bandwidth-constrained applications.

Better Alternatives for Most Users

If you need to preserve any detail from your HDR image, WBMP isn't the right choice. Consider these instead:

  • HDR to JPG - Maintains color and tonal detail in a universally compatible format
  • HDR to PNG - Lossless conversion with transparency support
  • HDR to EXR - Keeps full dynamic range for professional workflows

Choose WBMP only when monochrome output is specifically what you need.

Browser-Based Processing

Our converter works entirely in your browser:

  • Windows, Mac, Linux, Chromebook
  • Chrome, Firefox, Safari, Edge
  • Tablets and mobile devices

Your HDR files stay on your device throughout the conversion process. Nothing gets uploaded to external servers.

Pro Tip

If your HDR image has a dominant bright or dark area, the WBMP result may be mostly one color. Pre-adjust exposure in your HDR editing software before conversion to control where the black-white threshold falls.

Common Mistake

Expecting the WBMP to preserve any detail from the HDR. This is a lossy transformation to 1-bit color-you'll get a silhouette, not a photograph. Use PNG or JPG if you need recognizable imagery.

Best For

Extracting clean silhouettes from 3D renders, creating high-contrast graphic elements, or generating masks from HDR source material where only shape boundaries matter.

Not Recommended

Don't use this conversion if you need to preserve any tonal detail, color information, or photographic quality. WBMP is for edge cases requiring monochrome output for legacy systems or artistic effects.

Frequently Asked Questions

HDR (High Dynamic Range) files use the Radiance RGBE format to store images with extended brightness range. Each pixel uses 32 bits-RGB values plus a shared exponent-allowing representation of both very dark and very bright areas in a single image. Common in 3D rendering and professional photography.

WBMP (Wireless Application Protocol Bitmap) is a 1-bit monochrome image format originally designed for early mobile phones with limited displays. Each pixel is either black or white-no grayscale or color. The format is simple, tiny, and uncompressed.

The main use cases are silhouette extraction from renders, compatibility with legacy embedded systems, creating high-contrast graphic artwork, and extreme file size reduction when only shape information matters. It's a niche conversion for specific technical requirements.

No. HDR to WBMP conversion dramatically changes appearance. All color information is lost, and the full tonal range collapses to pure black or white. You get a high-contrast silhouette, not a faithful reproduction of the original.

The conversion applies a threshold to brightness values. Pixels brighter than the threshold become white; darker pixels become black. The result depends on your HDR's tonal distribution-high-key images produce mostly white output, low-key images mostly black.

Yes. Upload multiple HDR files and convert them all to WBMP in a single batch. This is useful when processing render sequences or creating consistent silhouettes from multiple source images.

Rarely. WBMP was designed for early WAP-enabled phones with monochrome displays. Modern mobile devices support full-color formats like PNG and JPG. WBMP persists mainly in legacy industrial systems and specialized embedded applications.

WBMP files are extremely small. A 1000x1000 pixel image is roughly 125KB uncompressed (1 bit per pixel). Your original HDR file could be megabytes; the WBMP output will be a fraction of that size.

For modern use, PNG with 1-bit color depth or even JPG offers better compatibility while maintaining small file sizes. WBMP only makes sense when you specifically need WAP compatibility or are working with systems that require this exact format.

No. The conversion happens entirely in your browser using client-side processing. Your HDR files never leave your device, ensuring privacy for sensitive renders or photographs.

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