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Sony Alpha RAW
The raw format powering the mirrorless revolution.
ARW is the raw image format used by Sony's Alpha series cameras (like the A7, A6000, and ZV series) and Cyber-shot RX series. As Sony became the dominant player in the mirrorless camera market, ARW became one of the most common raw formats in the world. ARW files contain the raw data from Sony's Exmor sensors. They are known for their malleability, allowing photographers to push shadows and pull highlights to extreme degrees without the image breaking apart.
ARW files are TIFF-based containers. Sony offers three main compression types: 1. **Uncompressed**: Massive files, but guaranteed maximum data integrity. 2. **Compressed (Lossy)**: The default for years. It uses a delta-compression scheme that can occasionally cause 'star eater' artifacts or posterization around high-contrast edges, but saves 50% space. 3. **Lossless Compressed**: Introduced in newer models (A7 IV, A1) to solve the quality issues of lossy compression without the massive size of uncompressed.
ARW replaced the older SR2 format. It has gone through several iterations (v2.3, v4.0). The format faced controversy in the past due to its lossy compression algorithm, which led Sony to introduce the Uncompressed and later Lossless Compressed options in response to user demand.
PNG (Portable Network Graphics)
The web's standard for lossless images with transparency, designed as a patent-free replacement for GIF.
PNG (Portable Network Graphics) emerged in 1996 as a direct response to the patent issues surrounding the GIF format's LZW compression algorithm. Developed by an informal working group and later standardized by the W3C, PNG was engineered from the ground up to be completely patent-free while offering superior technical capabilities. Unlike JPEG, which sacrifices image data for smaller files, PNG preserves every pixel exactly as captured or created. This lossless nature makes PNG the definitive choice for images where precision matters—screenshots, digital artwork, logos, and any graphic with text or sharp edges. The format's support for full alpha transparency (256 levels of opacity per pixel) revolutionized web design, enabling smooth drop shadows, gradient fades, and complex overlays that were impossible with GIF's binary transparency. Today, PNG is universally supported across all browsers, operating systems, and image editing software. While newer formats like WebP offer better compression, PNG remains the standard for lossless web graphics due to its unmatched compatibility and reliability.
PNG uses DEFLATE compression, the same algorithm powering ZIP files and gzip. This two-stage process first applies filtering to exploit the correlation between adjacent pixels, then compresses the filtered data using LZ77 followed by Huffman coding. The result is lossless compression that typically achieves 10-30% size reduction compared to raw pixel data, with some images compressing significantly more. The format supports multiple color types: grayscale (1-16 bits), indexed color with up to 256 palette entries, truecolor RGB (24 or 48 bits), and each with optional alpha channels. PNG's chunk-based architecture allows for extensibility—the file consists of a signature followed by typed chunks containing image data, metadata, and optional features like gamma correction and color profiles. PNG offers two interlacing modes: no interlacing (smaller file size) or Adam7 interlacing, which progressively renders the image in seven passes. While interlacing increases file size by approximately 10%, it provides a better user experience on slow connections by showing a low-resolution preview almost immediately.
PNG development began in January 1995 when Unisys announced it would enforce patents on GIF's LZW compression. Within weeks, an informal group on comp.graphics formed to create a replacement. Thomas Boutell published the first PNG specification draft in March 1995, and after extensive community input, PNG 1.0 became an official W3C Recommendation on October 1, 1996. The format underwent one major revision: PNG 1.2 in 1999 added the iCCP chunk for ICC color profiles and the sRGB chunk for standard color space indication. PNG became an ISO/IEC standard (15948) in 2003, cementing its position as a core web technology. The related APNG (Animated PNG) extension emerged in 2004 but remains unofficial, though it's now supported by all major browsers.
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