Image MIME Reference
DDS
DirectDraw Surface
image/vnd.ms-dds
VS
PCO B16 Image
image/vnd.pco.b16
PCO-B16
A complete technical comparison of DirectDraw Surface and PCO B16 Image — covering compression, feature support, browser compatibility, magic bytes, and when to choose each format.
Equal browser support
Feature Support
| Feature | DDS | PCO-B16 |
|---|---|---|
| Transparency (Alpha) | Yes | ✕ No |
| Animation Support | ✕ No | ✕ No |
| Progressive Loading | ✕ No | ✕ No |
| HDR Support | Yes | ✕ No |
| EXIF Metadata | ✕ No | ✕ No |
| ICC Color Profile | ✕ No | ✕ No |
DirectDraw Surface
image/vnd.ms-dds
Extension
.dds
Container
DirectDraw Surface
Compression
Block Compression (BC1-BC7) / DXTC / S3TC / Uncompressed (RGBA, Floating-Point)
Algorithm
DXT1-DXT5BC1-BC7ASTC / ETC2 (Extended)
Color Depth
8-bit, 16-bit, 24-bit, 32-bit (RGBA), 16-bit/32-bit Floating Point (HDR)
Developed by
Microsoft Corporation
Released
1999
Magic Bytes
44 44 53 20
PCO B16 Image
image/vnd.pco.b16
Extension
.b16
Container
PCO B16 Binary Container
Compression
Uncompressed (Raw Sensor Data)
Algorithm
None
Color Depth
16-bit (Monochrome or Bayer Raw Color)
Developed by
PCO AG (Excelitas PCO GmbH)
Released
Early 2000s
Magic Bytes
50 43 4F 2D
Browser Support Comparison
| Browser | DDS | PCO-B16 |
|---|---|---|
Chrome
|
✕ | ✕ |
Firefox
|
✕ | ✕ |
Safari
|
✕ | ✕ |
Edge
|
✕ | ✕ |
IE (Legacy)
|
✕ | ✕ |
DDS
DDS Strengths
- Massively reduces VRAM footprint and memory bandwidth usage because the GPU decodes the block compression in hardware
- Encapsulates complex texture arrays, volume textures, cubemaps, and entire mipmap chains within a single, highly structured file
- Supports high-dynamic-range (HDR) floating-point data for modern physically based rendering (PBR)
Limitations
- Block compression algorithms (like DXT) are lossy and can introduce ugly blocky artifacts, especially in smooth gradients or normal maps if not tuned properly
- Files are generally larger on the physical hard drive than highly compressed formats like PNG or WebP
- Zero support in web browsers or standard consumer image viewers
PCO-B16
PCO-B16 Strengths
- Preserves exact, uncompressed 16-bit raw sensor data, which is critically important for accurate scientific measurements, fluorescence microscopy, and photometry
- The simple, linear struct header is highly predictable and easy to parse in custom Python, MATLAB, or C++ scripts for researchers building bespoke pipelines
Limitations
- Generates massive file sizes due to the complete lack of image compression [1.3.1]
- Completely unsupported by standard operating systems, web browsers, and consumer image editing suites
- Strictly tied to the hardware and software ecosystems of a single camera manufacturer
When to choose which format
DDS
Use DDS when…
- Real-Time 3D Game Textures
- DirectX and Vulkan Rendering Pipelines
- Skyboxes and Environment Cubemaps
- Volume Textures (3D Textures)
PCO-B16
Use PCO-B16 when…
- Microscopy and Life Sciences
- High-Speed Camera Recording
- Machine Vision and Industrial Inspection
- Scientific Photometry