Convert PHM Images Online

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 PHM images to common formats like PNG, WEBP, JPEG, SVG, J2K, QOI and AVIF. This tool works for both professionals and casual users. Convert your images to the format you want in seconds.

Possible Conversions

FROM PHM

No supported conversions available yet.

TO PHM

No supported conversions available yet.

About PHM

Overview

PHM (Portable Half-Float Map) is a variant of the PFM format. Where PFM stores pixels as 32-bit single-precision floating point numbers, PHM stores them as 16-bit half-precision floats. This format is widely used in graphics hardware (GPUs) and HDR imaging where 32-bit precision is overkill and consumes too much memory.

Technical Details

The format follows the PFM structure but uses a different magic number in the header (typically `PH` or similar specific to the implementation, or relies on specific file extension conventions with Netpbm tools). The pixel data is raw binary 16-bit IEEE 754-2008 half-precision floating point values. This cuts the file size in half compared to PFM while maintaining enough dynamic range for most lighting data.

History

Evolved alongside the adoption of 'Half' precision types in GPUs (NVIDIA Cg, HLSL) and the OpenEXR format. It provided a simple raw dump format for this data type.

Common Use Cases

  • •GPU Texture Dumps: Saving the contents of a 16-bit floating point frame buffer.
  • •Machine Learning: Storing tensor data (which often uses float16) as an image.

Advantages

  • Efficiency

Limitations

  • Precision Loss
  • Compatibility

Technical Specifications

Extension: .phmMIME: image/x-portable-halffloatmapMax Color: 16-bit Float per channelCategory: specialized

Why choose Dynapik?

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Convert images files between over 20 formats. We support popular formats like PNG, JPG, WebP, HEIC and more.

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