It allows the users to pick a color for transparency directly from the processed data, simply by hovering over the respective color with the pointer of their mouse cursor. Pick a color for transparency is a newly introduced feature of MapTiler Engine 12. This keyword is used for the MapTiler Engine argument.
The keyword NODATA means that specific color pixels are not useful data (NO-DATA). The selected color from a system color palette form will be saved and displayed as NODATA #rrggbb, a hexadecimal representation of the color. The very common usage is for white or black borders. Instead of using the alpha band as a pixel map for transparency, it is possible to select a specific color, which will be turned into transparency pixels. This is a common option for 4-band raster images, where the 4th band is an infra-red channel (eg used for analytics). MapTiler Engine allows ignoring the 4th band as the alpha band, the Transparency option is called Ignore alpha band. If your image has defined an alpha band, MapTiler Engine will use it for the export to a map. There is another band, the alpha band, which defines the level of opacity for each pixel (Byte range 0 - 255). Image colors consist of three bands (channels) - Red, Green, and Blue.
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The value 0.0 (0%, 0) means full transparency - the color pixel will be invisible over the base map (or background color), and the value 1.0 (100 %, 255) means full opaque - the final pixel after blending is defined as only by this pixel color (defined in RGB channels). The value range is between 0.0 - 1.0 or 0% - 100% encoded values into Byte range 0 - 255. It is used to determine how a pixel is rendered when blended with another. Opacity is the extent to which something blocks light. ragged edges for countries) over the base map. This is heavily used in maps, as you can show your image with transparent areas (eg. If you put any background color under your image, transparent areas will have this background color. Transparency is the functionality that supports transparent areas in an image. Transparency of input file What is transparency? The transparency feature is available only for raster input images, not for vector input files.
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You can find a way, how to correctly get rid of white borders in the final map, or hide black background around the map. This article demonstrates the available options for transparency settings for your input map file.
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