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BPG Image Format Plugins

What is BPG format?

Its purpose is to replace the JPEG image format when quality or file size is an issue.
http://bellard.org/bpg/

Supported image viewers:

  • XnView / XnViewMP
  • Susie
  • Imagine

Features:

  • BPG read
  • BPG write (XnView, XnViewMP)
  • Multi-thread support

Not supported:

  • x64 (under development)
  • YCgCo / CMYK colorspace
  • Grayscale with limited component range
  • Premultiplied alpha
  • Writing 8-bit colour / 32-bit source images
  • Animation

Install Instructions

XnView (32-bit)

http://www.xnview.com/

  1. Download BPG-xnview-XXXX.7z from Releases
  2. Extract files into [program dir]\Plugins
  3. Rename or delete [program dir]\Plugins\bpgdec.exe
  4. Download BPG-dll-XXXX.7z
  5. Extract files into [program dir] (along with xnview.exe)
  6. Edit [program dir]\Plugins\Xbpg.ini to change encoding options

XnViewMP (32-bit)

http://www.xnview.com/

  1. Download BPG-xnview-XXXX.7z from Releases
  2. Extract files into [program dir]\plugins
  3. Rename or delete [program dir]\plugins\bpgdec.exe
  4. Check if avutil-55.dll & swscale-4.dll exist in [program dir]
    1. If not, download BPG-dll-XXXX.7z & extract files into [program dir] (along with xnviewmp.exe)
  5. Edit [program dir]\plugins\Xbpg.ini to change encoding options

Susie Plugin (for Hamana, etc.)

http://www.digitalpad.co.jp/~takechin/

  1. Download BPG-susie-XXXX.7z from Releases
  2. Extract files into the plugin directory of your image viewers
  3. Download BPG-dll-XXXX.7z
  4. Extract files into the directory where the *.exe file exists

Imagine (32-bit)

http://www.nyam.pe.kr/blog/entry/Imagine

  1. Download BPG-imagine-XXXX.7z from Releases
  2. Extract files into [program dir]\Plugin
  3. Download BPG-dll-XXXX.7z
  4. Extract files into [program dir] (along with Imagine.exe)

Encoding options

Most of image viewers have no GUI for user plugins, so you need a file to set encoding options. You can specify different options for 8-bit & 24-bit images. The line started with 24: indicates the options for 24-bit images, and 8: for 8-bit images.

Supported options (see: bpgenc):

  • -q (0~51) set quantizer parameter (smaller gives better quality, default=29)
  • -f (420|422|444) set the preferred chroma format (default=420)
  • -loseless enable lossless mode (default=off)
  • -m (1~9) select the compression level (1=fast, 9=slow, default=8)

Example:

8:-q 30
24:-q 25

References