Convert PTX to BMP — Free Online Converter
Convert Pentax Raw (.ptx) to Bitmap Image (.bmp) online for free. Fast, secure image conversion with no watermarks or registration....
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How to Convert
Upload your .ptx file by dragging it into the upload area or clicking to browse.
Choose your output settings. The default settings work great for most files.
Click Convert and download your .bmp file when it's ready.
About PTX to BMP Conversion
PTX is Pentax's older proprietary RAW format used by earlier Pentax and Samsung-branded digital SLR cameras, including the Pentax *ist D, *ist DS, *ist DL, and Samsung GX-1S/GX-1L models. These cameras featured CCD and CMOS sensors capturing 6-10 megapixel Bayer pattern data. The format was replaced by PEF (Pentax Electronic File) in subsequent models, making PTX a legacy format primarily associated with mid-2000s Pentax photography.
Converting PTX files to BMP produces uncompressed bitmap images where every demosaiced pixel is stored as raw RGB triplets without any compression. BMP's uncompressed nature makes it ideal for legacy systems, industrial equipment, and scientific instruments that require direct pixel access without needing to decode modern compression algorithms.
Why Convert PTX to BMP?
BMP is natively supported by every version of Windows and virtually every image viewer created since the early 1990s. Systems that cannot decode PTX RAW files — including embedded industrial controllers, vintage software, and kiosk displays — can always read BMP without issue. For Pentax *ist series photographers who still maintain archives of early digital work, converting to BMP ensures permanent readability.
Pentax cameras from the PTX era were popular among budget-conscious photographers and outdoor enthusiasts attracted to Pentax's weather-sealed bodies. Many of these users accumulated significant photo libraries that now sit in a format supported by fewer and fewer applications. BMP conversion creates a universally accessible copy, even if the original PTX files become completely unsupported.
Common Use Cases
- Preserve Pentax *ist D photography archives in universally readable BMP format
- Feed Pentax PTX captures into legacy machine vision or inspection systems requiring uncompressed input
- Deliver Pentax *ist DS product documentation photos to embedded display systems
- Create uncompressed reference copies of Samsung GX-1S images for archival purposes
- Supply Pentax PTX-era photography to scientific instruments that only accept BMP files
How It Works
The conversion reads the PTX container, extracts the 6-10 megapixel Bayer pattern CCD/CMOS sensor data, and performs demosaicing to produce full-color RGB output. Pentax's embedded white balance, color matrix, and exposure metadata are applied during the RAW development stage. The result is written as a 24-bit Windows DIB bitmap with bottom-up row ordering. A 10 MP Pentax *ist DS2 file produces a BMP of approximately 29 MB uncompressed.
Quality & Performance
BMP applies zero compression, so the format conversion itself introduces no artifacts. The pixel values exactly match the output of the demosaicing algorithm. Since PTX-era Pentax cameras used 6-10 MP sensors, the resulting BMP files are modest in size compared to modern cameras. The primary quality consideration is the demosaicing interpretation of the Bayer data, which is a one-way process that cannot be reversed from the BMP output.
Device Compatibility
| Device | PTX | BMP |
|---|---|---|
| Windows PC | Partial | Native |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No | No |
Tips for Best Results
- 1PTX files from 6 MP sensors produce modest 18 MB BMPs — batch conversion is practical even on limited storage
- 2For general archival, consider PNG or TIFF instead of BMP for lossless quality at smaller file sizes
- 3Pentax's weather-sealed cameras were often used outdoors — check white balance settings before batch conversion
- 4Archive both the original PTX file and the converted BMP when storage allows
- 5If the target system accepts PNG, prefer it over BMP for lossless compression without quality loss
PTX to BMP conversion provides a permanent, universally readable format for legacy Pentax and Samsung GX camera archives. The files are reasonably sized given the lower megapixel counts of these early digital SLRs, making BMP a practical preservation choice.