ORF files are proprietary RAW images captured by Olympus and OM System cameras, including the popular OM-D E-M1 series, PEN-F, and the newer OM-1 mirrorless bodies. These files store unprocessed 12-bit sensor data from Micro Four Thirds sensors — typically around 20 megapixels — along with Olympus-specific metadata such as Art Filter presets, in-body image stabilization (IBIS) telemetry, and multi-shot High Res data. Because ORF is a proprietary RAW format, most applications outside dedicated photo editors cannot open it directly.

BMP (Bitmap) is one of the oldest raster image formats, dating back to early Windows releases. It stores pixel data in an uncompressed grid, making it universally readable by virtually every image viewer, operating system, and legacy application. Converting ORF to BMP gives you a fully demosaiced, color-corrected image that any system can display without specialized RAW processing software.

Olympus ORF files require RAW-aware software like Olympus Workspace, Adobe Lightroom, Capture One, or darktable to open and edit. If you need to view your Micro Four Thirds captures on a machine without these tools — a public kiosk, an older Windows workstation, or an embedded display system — BMP provides zero-dependency image viewing. Every version of Windows since 3.0 renders BMP natively.

BMP is also useful when you need pixel-perfect, uncompressed output for technical applications. Scientific imaging, machine vision pipelines, and legacy print workflows sometimes require BMP because it guarantees no compression artifacts alter the pixel data. When converting from ORF, the RAW sensor data is demosaiced and rendered at full resolution, then saved with every pixel preserved exactly as computed.

The conversion reads the 12-bit Bayer-pattern sensor data from the ORF container, applies demosaicing to reconstruct full-color RGB pixels, and performs basic color correction using the camera's white balance metadata. The output is written as an uncompressed 24-bit BMP (8 bits per channel, RGB). A 20-megapixel ORF file (~15 MB) produces a BMP of approximately 57 MB due to the uncompressed storage format. No sharpening or noise reduction is applied beyond the standard demosaicing interpolation.

Yes. The BMP output is a rendered, baked image — you lose the ability to adjust white balance, exposure recovery, and other RAW parameters. Always keep your original ORF files if you might want to re-edit later.

ORF files use compressed RAW data (~15-25 MB for 20 MP), while BMP stores every pixel uncompressed at 24 bits. A 20 MP image requires about 57 MB in BMP. The size increase is normal for uncompressed formats.

Yes. ORF is used across all Olympus and OM System bodies, from the original E-series DSLRs through the OM-D mirrorless line and the current OM-1 II. The converter handles all ORF variants.

No. Art Filter data is stored as metadata in the ORF file but is not applied during RAW conversion. The output uses standard color rendering. To apply Art Filters, process the ORF in Olympus Workspace first.

PNG uses lossless compression — identical pixel quality but much smaller files. Choose BMP only when the receiving system cannot handle PNG, or when you need raw pixel data without any compression layer.

Device	ORF	BMP
Windows PC	Partial	Native
macOS	Partial	Partial
iPhone/iPad	Partial	Partial
Android	Partial	Partial
Linux	Partial	Partial
Web Browser	No	No

Funktion	ORF	BMP
Fullstandigt namn	Olympus RAW Format	Bitmap Image
Filandelse	.orf	.bmp
Bast for	Olympus cameras	Uncompressed

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