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Tile a big image using Libvips

An excellent tool for image processing, and also for image tiling, is Libvips.

Libvips installation

Libvips is supported on Linux and Windows. It can be used from the command line (the most easy way).

  • For Linux

    Libvips is packaged in most distributions. For example, on Ubuntu it can be installed with :

    sudo apt install libvips

  • For Windows

    Libvips binaries can be downloaded from here. The executables are inside the vips-dev-w64-all-x.x.x.zip

Using Libvips

If we want to tile the image named big_image.png :

  • On Linux

    vips dzsave big_image.png output --layout=google --tile-size=256 --suffix .jpg --vips-progress

  • On Windows

    For convenience, you can execute vips.exe in the image's parent directory. You can right-click in the folder while holding the left Shift keystroke, then "Execute a command here".

    vips.exe dzsave big_image.png output --layout=google --tile-size=256 --suffix .jpg --vips-progress

In that command, you can specify :

  • the size of tiles, with the option --tile-size
  • the quality and format of the tiles. For example, using .jpg[Q=90] will increase the quality but also the size in MB of map.

At the end of the tiling process, a folder "output" is created. You can rename it to whatever name you like. That folder contains several subfolders that are number-named (0, 1, 2, etc). Each subfolder corresponds to a level of the map.