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BPG Image format

News

• (Apr 21 2018) Release 0.9.8 is available.

Introduction

• High compression ratio. Files are much smaller than JPEG for similar quality.
• Supported by most Web browsers with a small Javascript decoder (gzipped size: 56 KB).
• Based on a subset of the HEVC open video compression standard.
• Supports the same chroma formats as JPEG (grayscale, YCbCr 4:2:0, 4:2:2, 4:4:4) to reduce the losses during the conversion. An alpha channel is supported. The RGB, YCgCo and CMYK color spaces are also supported.
• Native support of 8 to 14 bits per channel for a higher dynamic range.
• Lossless compression is supported.
• Various metadata (such as EXIF, ICC profile, XMP) can be included.
• Animation support.

Download

libbpg-0.9.8.tar.gz

Binary distribution for Windows (64 bit only): bpg-0.9.8-win64.zip

Unofficial Github mirror.

For Mac users, the BPG utilities are available in the libbpg Homebrew formula.

Performance

• Mozilla did a study of various lossy compressed image formats. HEVC (hence BPG) was a clear winner by a wide margin. BPG files are actually a little smaller than raw HEVC files because the BPG header is smaller than the corresponding HEVC header.
• BPG natively supports 8 to 14 bits per channel when most other formats use 8 bits (including most of the JPEG implementations and WEBP). It gives a higher dynamic range (which is important for cameras and new displays) and a slightly better compression ratio (because there are less rounding errors in the decoder).
• BPG uses high quality decimation (10 tap Lanczos filter) and interpolation (7 tap Lanczos filter) to handle the chroma samples in 4:2:2 and 4:2:0 formats.
• BPG can be supported in hardware with standard HEVC decoders and encoders (it uses a subset of the Main 4:4:4 16 Still Picture Profile, Level 8.5).

Demo

• Visual comparison between BPG (x265 encoder), JPEG (mozjpeg encoder), JP2K and WebP
• Lena 512x512 image, visual comparison with JPEG
• Wikipedia photos
• Images with alpha channel
• Test images using different color spaces and bit depth
• Test animations

Technical information

Licensing

• The BPG decoding library uses a modified version of FFmpeg released under the LGPL version 2.1 as HEVC decoder. The BPG decoding library excluding the FFmpeg code is released under the BSD license.
• The BPG encoder as a whole is released under the GPL version 2 license. The BPG encoder sources excluding x265 are released under the BSD license. The x265 library is released under the GPL version 2 license. The optional JCTVC HEVC reference encoder is released under the BSD license.
• Some of the HEVC algorithms may be protected by patents in some countries (read the FFmpeg Patent Mini-FAQ for more information). Most devices already include or will include hardware HEVC support, so we suggest to use it if patents are an issue.