How to

Advanced image settings

Advanced image settings

The Advanced image settings can be accessed from the screent, that comes prior rendering by clicking on the “advanced options” button.

Advanced

There are several options you can choose.

Tile format

The produced tiles can be saved in one of several image format. MapTiler includes optimization of the final filesize and used number of colors (quantization), to minimize the disk size occupied by the rendered maps as well as the time necessary to transfer the maps to clients once the tiles are online.

Formats with support for transparency are:

  • png 8a which is DEFAULT. Paletted RGBA PNG image
  • png 32-bit

Non-transparent formats are:

  • Progressive JPEG image in the YCbCr color space
  • Paletted RGB PNG image
  • 24-bit RGB PNG image

Advanced

Resampling methods

The visual quality of the output tiles is also defined by the resampling method. Selected method is used for interpolation of the values of individual pixels and it affects the sharpness vs smoothness of the produced maps.

  • DEFAULT. Bilinear resampling (2x2 pixel kernel)
  • Nearest neighbor resampling. Rarely makes sense for production data. Can be useful for quick testing, since it is much faster the the others.
  • Cubic convolution approximation (4x4 pixel kernel).
  • Cubic B-Spline Approximation (4x4 pixel kernel).
  • Average computes the average of all non-NODATA contributing pixels. (GDAL >= 1.10.0)
  • Mode resampling, selects the value which appears most often of all the sampled points. (GDAL >= 1.10.0)

Advanced

Transparency settings

This option is typically used to eliminate borders of multiple map sheets that are stitched together. You can set a specific color of the map to be considered fully transparent during rendering.

Advanced

Tiling scheme

  • Open GIS WMTS / Open Street Maps / Google XYZ (top-left-origin)
  • OSGEO TMS (bottom-left-origin)

Advanced