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Olympus RAW
The raw format for Micro Four Thirds photography.
ORF is the proprietary raw image format used by Olympus (now OM System) cameras. It is the standard raw format for the Micro Four Thirds system cameras produced by Olympus. ORF files contain the unprocessed data from the sensor. Because Micro Four Thirds sensors are smaller than APS-C or Full Frame, the raw data is critical for maximizing image quality, noise reduction, and dynamic range.
ORF files are TIFF-based. They store 12-bit or 14-bit sensor data. A unique feature of modern Olympus cameras is 'High Res Shot' mode, which shifts the sensor to take 8 or 16 images and merges them into a single massive raw file (up to 80 megapixels). This resulting file is still an .orf, but it contains vastly more data than a standard shot.
ORF has been used since the early Olympus E-System DSLRs. It has persisted through the transition to mirrorless PEN and OM-D series. With the rebranding to OM System, the format extension remains .orf.
PNG-32 (32-bit RGBA)
The gold standard for web graphics requiring smooth, complex transparency.
PNG-32 is the most capable version of the PNG format commonly used on the web. It combines the 24-bit true color of PNG-24 with an additional 8-bit alpha channel, hence the name (24 + 8 = 32 bits). This alpha channel is the game-changer: it allows every single pixel to have its own level of opacity, from 0 (fully transparent) to 255 (fully opaque). This enables rich, complex visual effects like drop shadows, glows, glass-like translucency, and anti-aliased (smooth) edges that blend perfectly onto any background color. Whenever you see a high-quality logo with a transparent background or a complex UI overlay on a website, you are almost certainly looking at a PNG-32 image.
A PNG-32 image contains four channels: Red, Green, Blue, and Alpha (RGBA). Each channel is 8 bits. The RGB channels store the color information, while the Alpha channel stores the transparency map. This structure allows for 'variable transparency'. Unlike GIF, which is either 'on' or 'off', a PNG-32 pixel can be 50% transparent. This is essential for anti-aliasing—the technique of smoothing jagged edges by making the edge pixels semi-transparent. Without this, diagonal lines and curves look pixelated (aliased) when placed against a background.
Support for PNG-32's alpha transparency was the major hurdle in PNG's early adoption. While the format supported it from the start (1996), the dominant browser of the time, Internet Explorer 6, famously displayed transparent PNGs with a gray background. It wasn't until IE7 (2006) that native support arrived, finally allowing designers to move away from GIF for transparent graphics.
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