Image formats - HERE Raster Tile API

The image formats supported by the HERE Raster Tile API include PNG, JPEG, and PNG8. When you select an image format for your map tiles, consider the complexity of your map, the number of colors required, the need for transparency, and the trade-off between the file size and visual quality of the map image.

Based on the style, the recommended format parameter values are:

jpeg for any style that includes satellite imagery such as satellite.day style or explore.satellite.day style,
png8 for all the other styles,
png an an alternative to the png8 when you prefer full image colors over smaller image file size.

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Note
Due to the internal representation of satellite imagery, the PNG image format does not result in better image quality as the JPEG image format despite the much larger image size.