Ruigu Electronic

Benefits of HEIF: Why Switch from JPEG to HEIC

2025-12-10

HEIF (High Efficiency Image File Format)

1. Basic Definition

HEIF (ISO/IEC 23008-12) is a modern image and video file format developed by the Moving Picture Experts Group (MPEG). It is designed to replace legacy formats like JPEG by offering superior compression efficiency, support for advanced features (e.g., HDR, animations, multiple images), and smaller file sizes while maintaining or improving image quality. HEIF files use the .heic (High Efficiency Image Coding) extension for images (encoded with HEVC/H.265) and .heif for containers with multiple images/videos.

2. Core Technical Foundations

2.1 Compression Technology

HEIF leverages HEVC (H.265) video compression (or AV1 for newer implementations) instead of JPEG’s discrete cosine transform (DCT). Key compression advantages:

Intra-frame Compression: Encodes each image as a single HEVC frame, reducing redundancy with spatial prediction (e.g., neighboring pixels).
Inter-frame Compression: For sequences (e.g., burst photos, live photos), HEIF stores only differences between frames (like video), drastically reducing file size for multiple images.
Variable Bit Depth: Supports 8–16 bits per channel (vs. JPEG’s 8-bit limit), enabling HDR and wide color gamut (WCG) content (e.g., Rec. 2020, Dolby Vision).

2.2 Container Structure

HEIF is a flexible container format (based on the ISO Base Media File Format, ISOBMFF) that can store:

Single images (.heic).
Image sequences (e.g., burst shots, slow-motion clips).
Live photos (image + audio).
Thumbnails, metadata, and depth maps (for portrait mode effects).
Multiple color representations (e.g., SDR + HDR versions of the same image).

3. Key Advantages Over Legacy Formats

Feature	HEIF/HEIC	JPEG	PNG
Compression Efficiency	50% smaller file size at equivalent quality (e.g., a 10MB JPEG becomes 5MB HEIC).	Larger file sizes; lossy compression degrades quality with repeated saves.	Lossless but very large file sizes (poor for photos).
Bit Depth	8–16 bits/channel (supports HDR/WCG).	8 bits/channel (limited dynamic range, banding in gradients).	8–16 bits/channel (lossless but inefficient).
Feature Support	Multiple images, animations, depth maps, live photos, HDR.	Single static image only; no HDR/WCG support.	Single static image; no animation/HDR support.
Transparency	Supports alpha channels (like PNG).	No transparency support.	Supports alpha channels (lossless).

3.1 Practical Benefits

Storage Savings: Critical for smartphones/cameras (e.g., iPhone captures HEIC by default, doubling storage capacity for photos).
HDR Compatibility: Natively supports HDR10 and Dolby Vision, unlike JPEG (which requires workarounds like JPEG-HDR).
Flexibility: Combines photos, videos, and metadata in one file (e.g., Apple’s Live Photos use HEIF to store a still image + 3-second video).

4. Limitations & Compatibility

4.1 Adoption Barriers

Software/Device Support: Older operating systems (e.g., Windows 10 prior to 2018, macOS before Sierra) and apps (e.g., legacy photo editors) lack native HEIF support.
Editing Workflows: Some professional tools (e.g., older versions of Adobe Photoshop) require plugins to edit HEIF files.
Web Compatibility: Most web browsers (Chrome, Firefox) support HEIF only in limited contexts (e.g., iOS/macOS); JPEG remains the de facto web standard.

4.2 Workarounds

Conversion: Tools like Apple Photos, Adobe Lightroom, or online converters can export HEIF to JPEG/PNG for compatibility.
Native Support: Modern platforms (iOS 11+, macOS 10.13+, Android 9+, Windows 10 1809+) include built-in HEIF decoding.

5. HEIF vs. AVIF

AVIF (AV1 Image File Format) is a newer format based on the AV1 video codec (open-source, royalty-free). It offers:

Slightly better compression than HEIF (10–20% smaller files at the same quality).
Royalty-free licensing (HEIF/HEVC may require patents fees for commercial use).
Wider industry support (backed by Google, Netflix, Amazon).

HEIF remains dominant in consumer devices (e.g., iPhones, Samsung Galaxy) due to early adoption, while AVIF is gaining traction in web and open-source ecosystems.

6. Application Scenarios

Smartphones/Cameras: Default capture format for iPhones (iOS 11+), Samsung Galaxy (Android 9+), and mirrorless cameras (e.g., Sony Alpha series) to save storage and enable HDR.
Professional Photography: Used for raw image processing (HEIF-based raw formats like Apple’s ProRAW) and HDR workflows.
Multimedia Content: Stores live photos, burst shots, and slow-motion clips in a single file (e.g., Google Pixel’s Motion Photos).
Streaming/Storage: Efficiently archives high-quality photos/videos with minimal storage overhead.

7. Implementation Examples

7.1 iPhone HEIF Capture

Apple’s iPhones capture photos in HEIC by default, with options to convert to JPEG for sharing. HEIC files on iPhone include:

A main 16-bit HDR image.
A compressed 8-bit SDR thumbnail for previews.
Depth data (for portrait mode).

7.2 HEIF in Professional Workflows

Adobe Lightroom Classic (2020+) supports HEIF editing, including HDR and raw HEIF files (e.g., ProRAW). Users can export to JPEG/PNG for delivery while retaining the original HEIF for editing.