ORF to AVIF Converter

What is ORF to AVIF conversion?

ORF to AVIF conversion transforms unprocessed RAW data from Olympus and OM System cameras into AVIF, the most efficient modern image format available today. ORF (Olympus Raw File) is a proprietary RAW container used by all Olympus and OM System mirrorless cameras, including the OM-1 Mark II, OM-5, E-M1 Mark III, E-M1X, E-M10 Mark IV and PEN-F. An ORF file contains 12-bit raw sensor data from a Micro Four Thirds sensor (17.3 by 13 mm, 2x crop factor), Bayer color filter pattern information, white balance metadata, M.Zuiko lens profile, and Olympus-specific Maker Notes covering computational photography features like Live ND, Pixel Shift modes and Pro Capture buffer.

AVIF (AV1 Image File Format) is the newest mainstream image format, developed by the Alliance for Open Media in 2019. It is based on the AV1 video codec, the same one used by next-generation streaming services. AVIF's compression efficiency surpasses JPEG by approximately 2-3 times and WebP by 1.5-2 times at comparable or better visual quality. This means a 20 MB ORF file becomes an AVIF file of just 200-700 KB at quality indistinguishable from high-quality JPG.

Converting ORF to AVIF is particularly valuable for web developers, photographers maintaining image-heavy sites, e-commerce store owners, mobile app developers, and any project where loading speed and bandwidth conservation are critical. AVIF supports 10- and 12-bit color depth, extended color gamut (HDR, BT.2020, Display P3), alpha channel and animation - capabilities unavailable in most competing formats.

Modern browsers have been actively adopting AVIF support: Google Chrome (since version 85, August 2020), Mozilla Firefox (since version 93, October 2021), Apple Safari (since version 16, September 2022 on macOS Ventura and iOS 16), Microsoft Edge, Opera. As of 2025, AVIF is supported by over 95% of active browsers, making it suitable as a primary format for web publishing.

What is the AVIF format and its technical advantages

AVIF uses the AV1 codec, developed by the Alliance for Open Media consortium (Google, Mozilla, Microsoft, Apple, Netflix, Amazon, Intel and others). AV1 is an open, royalty-free codec, distinguishing it from patent-encumbered HEVC/H.265 used in HEIF format.

The AV1 algorithm includes several technical innovations: variable block sizes from 4x4 to 128x128 pixels, 56 intra-prediction modes, an expanded set of transforms (DCT, ADST, FLIPADST, identity transform), sophisticated deblocking and noise filtering. These innovations enable AV1 (and consequently AVIF) to achieve significantly higher compression at equivalent visual quality compared to the previous generation of codecs.

Unlike JPEG, which operates with fixed 8x8 pixel blocks using DCT, AVIF divides images into variable-size blocks based on local detail. Smooth areas (sky, blurred backgrounds) are coded with large blocks using minimal bits, while detailed areas (hair, textures) use small blocks with greater precision. This distribution makes AVIF particularly effective on images with varied content complexity - typical nature photographs, portraits, urban scenes.

AVIF supports 8-, 10- and 12-bit color depth per channel. The 12-bit depth is critical for HDR images and matches the bit depth of source ORF, allowing transfer of tonal headroom without losses. Standard color spaces sRGB, Display P3, Rec. 2020 and custom ICC profiles are supported. Alpha channel can be stored with 8 or 12 bits, providing higher quality transparency than PNG.

Detailed format comparison

The main advantage of AVIF over ORF is universal accessibility in modern browsers and operating systems with minimal file size. The main advantage of AVIF over JPG and WebP is significantly more efficient compression and support for 10/12-bit color depth, particularly useful for landscapes with wide dynamic range and for HDR displays.

When to choose AVIF over other formats

Performance-critical websites and SEO

Google Core Web Vitals directly account for page loading speed. Largest Contentful Paint (LCP), a key ranking factor, often depends specifically on the speed of loading large images. AVIF accelerates LCP by 2-3 times compared to JPG, which directly affects search rankings.

Mobile applications with data savings

Users in regions with limited or expensive internet benefit significantly from AVIF. An app using OM-1 photos in AVIF consumes 2-3 times less data than the same app with JPG.

HDR photography for modern displays

AVIF supports HDR metadata and 10/12-bit depth, fully utilizing the capabilities of modern HDR monitors and smartphones. OM System photos processed in HDR mode preserve extended dynamic range after AVIF conversion, unavailable through JPG.

Next-generation e-commerce catalogs

Modern e-commerce platforms (Shopify, BigCommerce, Magento Cloud) already support AVIF at the image delivery service level. Converting OM-1 product shots to AVIF can shorten product page loading by seconds.

Content sites and online media

News portals, magazines, blogs with rich visual content benefit substantially from AVIF. A photo report page with OM-1 or E-M1 Mark III images in AVIF loads significantly faster, improving all engagement metrics.

Technical aspects of ORF to AVIF conversion

Demosaicing and basic processing

The Micro Four Thirds sensor in Olympus / OM System cameras uses a Bayer color filter array, so each photosite records only one color channel. The demosaicing algorithm reconstructs full RGB values for each pixel. A color matrix then converts to standard color space (sRGB or Display P3), white balance is applied, and gamma correction is performed. These steps are necessary for any output raster format.

Color space conversion

AVIF supports multiple color spaces: classic sRGB, extended Display P3 (used in newer iPhones and macOS), and Rec. 2020 (full range for HDR). For compatibility with most devices, sRGB is typically used.

Encoding with AV1

The processed RGB image is encoded using AV1. The encoder analyzes the image and selects optimal block size, prediction mode, and transform type for each region. The CRF (Constant Rate Factor) or quality parameter determines how aggressively high-frequency coefficients are quantized: lower CRF (or higher quality) means fewer losses and larger files.

Encoding time and compression

AV1 is a computationally complex codec, especially at maximum quality settings. Encoding one 20 MP OM System photo to AVIF can take seconds to tens of seconds depending on chosen parameters. This is the price for impressive compression efficiency in the resulting files.

Best photo types for ORF to AVIF conversion

Web portfolios and galleries for OM System photographers

Photographers maintaining portfolio sites with work shot on OM-1, OM-5 or E-M1 Mark III gain the greatest benefit from AVIF. The ability to display extensive galleries at minimal file sizes improves user experience and SEO metrics simultaneously.

Landscapes with wide dynamic range

Photos with deep shadows and bright highlights (sunsets, sunrises, backlight, night cityscapes) benefit from AVIF's 10- and 12-bit depth. Tonal gradations remain smooth even after aggressive corrections.

Architectural shots in High Res Shot

Tripod High Res Shot 80-megapixel ORF files converted to AVIF take just 1-3 MB versus 200-400 MB as PNG. This makes it practical to embed highly detailed architectural images directly in browsers with zoom capability.

Travel blogs with abundant photos

Since OM System is valued by travel photographers for the lightweight Micro Four Thirds kit, these photographers accumulate thousands of frames. AVIF conversion enables creating visually rich blogs with dozens of images per page without inflating overall size.

Product catalogs

Product photos from OM-1, converted to AVIF with transparency, give product cards minimal file size and maximally fast loading. This positively impacts purchase conversion.

Advantages of the AVIF format

Minimal file sizes at excellent quality

AVIF is the most compression-efficient of widely supported image formats. At visual quality indistinguishable from JPG quality 90, AVIF takes 2-4 times less space. For a large photo project, this means saving server space, bandwidth and load time.

10/12-bit depth and HDR support

Unlike JPG and WebP (8-bit), AVIF supports 10- and 12-bit color depth per channel. This preserves extended tonal range, especially valuable for HDR-processed landscapes and for viewing on modern HDR displays.

High-quality alpha channel

AVIF supports 8- and 12-bit alpha channel, providing higher-quality transparency than PNG (8-bit). This is useful for product photography with soft semi-transparent edges (shadows, reflections).

Wide color gamut support

AVIF correctly handles Display P3 (the standard for modern Apple devices) and Rec. 2020. Photographers shooting OM System in Adobe RGB can preserve extended color gamut after AVIF conversion.

Open and royalty-free standard

AVIF is based on the open AV1 codec, guaranteeing absence of patent restrictions. The format is developed by a consortium of major technology companies, ensuring long-term support and development.

Limitations and considerations

Modern systems only

Outdated browsers (Internet Explorer, Safari below 16, older versions of Chrome and Firefox) do not support AVIF. Sites with older audiences may require JPG or WebP fallback through the picture tag.

Long encoding time

AV1 is a computationally complex codec. Encoding a single photo can take significantly longer than for JPG or WebP, especially at high quality settings. For batch processing of large galleries, this can be noticeable.

Limited support in some applications

Many desktop graphics editors (older Photoshop versions, GIMP without plugins, specialized printing programs) do not directly support AVIF. Working with such images may require intermediate conversion to a more common format.

Not suitable for printing

Photo labs and online photo printing services typically do not accept AVIF. For printing OM System photos, use JPG, TIFF or PNG.

Loss of Olympus Maker Notes

Conversion to AVIF drops Olympus-specific service data: Art Filter settings, Picture Mode parameters, Live ND configurations, Pixel Shift information, and AI Detect AF subject tracking data. Standard EXIF (camera model, lens, shutter speed, aperture, ISO, GPS) may be preserved, but implementation depends on the tool.

Basic decoding limitations

This service performs basic ORF decoding with default processing parameters: white balance from camera metadata, standard sRGB gamma correction, and automatic demosaicing. White balance adjustment, exposure compensation, highlight and shadow recovery, tone curves, noise reduction, and Olympus Art Filter or Picture Mode emulation are not available. For full RAW processing with control over all parameters, use Adobe Lightroom, Capture One, RawTherapee, or OM Workspace.

Irreversibility

AVIF cannot be converted back to 12-bit ORF sensor data. Always preserve original ORF files on backup storage.