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HEIC (High Efficiency Image Container)
Apple's standard for high-quality, space-saving mobile photography.
HEIC (High Efficiency Image Container) is the default image format for iPhones and iPads. Introduced by Apple in 2017 (iOS 11), it is based on the HEVC (H.265) video compression standard. HEIC was designed to solve a specific problem: smartphone cameras were capturing more detail than ever, filling up storage space rapidly. HEIC files are roughly half the size of JPEGs with equivalent quality, effectively doubling the number of photos a user can store on their device. While technically superior to JPEG, HEIC is hindered by patent licensing issues, which has prevented it from being supported natively in web browsers like Chrome and Firefox. It remains primarily a storage and capture format rather than a web delivery format.
HEIC is a container format (based on ISO Base Media File Format) that wraps HEVC-encoded image data. Because it is a container, a single .heic file can hold multiple images (like a burst shot or a Live Photo), audio, and depth map data for portrait mode effects. It supports up to 16-bit color, enabling it to capture the wide color gamut (P3) used by Apple's displays and cameras. This is a significant upgrade over JPEG's 8-bit sRGB limitation.
The HEIF standard was finalized by MPEG in 2015. Apple adopted it in 2017, instantly making it one of the most common image formats in the world by volume of photos taken. Microsoft added support to Windows 10 via an extension, and Android added native support in version 10 (2019).
GIF 87a
The original 1987 specification of the Graphics Interchange Format.
GIF 87a is the original version of the GIF format, published by CompuServe in 1987. It introduced the core features that made GIF famous: LZW compression for small file sizes and support for 256 indexed colors. However, unlike the ubiquitous GIF 89a, this original version lacks support for transparency, animation delays, and metadata comments.
A GIF 87a file starts with the header signature `GIF87a`. It defines the Logical Screen Descriptor and the Global Color Table. While it supports multiple image blocks within a single file (which could conceptually form an animation), it lacks the 'Graphic Control Extension' block introduced in 89a. This means there is no standard way to define frame delays, disposal methods, or transparent indices.
Developed by CompuServe in 1987 to provide a hardware-independent, compressed color image format for their online service. It replaced the earlier RLE-based formats and was designed to be efficient over slow modems.
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