CPHD File - CloudChan Pre-processed Hypertext Document Format
What is a CPHD file?
A CPHD file is a Hypertext document used by the CloudChan pre-processor engine. It contains HTML and scripts to create dynamic web pages and documents. Scripts inside a CPHD file resembles the syntax used by Java. The CPHD web page returns an HTML document when executed on a CloudChan processes. CPHD format can work with any XML document.
CPHD File Format
CPHD files are stored to disc as plain text files. This makes it possible to open these files in any text editor such as Notepad or Notepad++.
Key Characteristics of CPHD Files
| Characteristic | Description |
|---|---|
| Extension | .cphd |
| MIME Type | image/x-cphd (unofficial, varies by implementation) |
| Magic Numbers | Typically begins with “CPHD” or 0x43504844 in hexadecimal |
Technical Specifications
| Specification | Details |
|---|---|
| Maximum Bit Depth | 12-bit per channel |
| Compression Type | Lossless/Lossy hybrid (configurable) |
| Color Spaces | sRGB, Display P3, Adobe RGB, ProPhoto RGB |
| Maximum Resolution | No fixed limit (tested up to 200MP) |
| Transparency Support | Yes (alpha channel capable) |
| Animation Support | No (single-frame still format) |
FAQ
Q1: Can I open CPHD files in Photoshop?
A: Yes, but you’ll need to install a free plugin or convert the files first. Photoshop CC 2022 and later can open CPHD files via the Camera Raw plugin with proper configuration.
Q2: Are CPHD files larger than JPEGs?
A: YSignificantly. Expect CPHD files to be 5-8 times larger than equivalent JPEGs, but substantially smaller than TIFFs or uncompressed RAW formats.
Q3: Can I convert CPHD to JPEG without quality loss?
A: No, conversion always loses the extra bit depth and editing flexibility. However, CPHD files contain an embedded JPEG preview that can be extracted without additional compression.
Q4: Do all smartphones support CPHD capture?
A: No, CPHD is not yet a standard format on most devices. It typically requires third-party camera apps or specific manufacturer implementations.
Q5: Is CPHD better than Apple ProRAW?
A: They serve similar purposes with different approaches. ProRAW is optimized for Apple’s ecosystem, while CPHD offers broader cross-platform compatibility and smaller file sizes.
References
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