Rasters exported from QGIS (via Save As > Rendered Image) do not retain original styling. See attached. Any thought on how to prevent this error? The top image is exported from QGIS as a .bmp, the bottom is a screen grab from tilemill. Thanks.
When you save your raster layer as
Rendered image from QGIS, the saved image quality depends on your choosed profile parameters. Please, check your settings to find which of them alters your output quality: