Internal function to create JPEG or PNG images from a singleband raster file. This function is used by s2_thumbnails, and it will be exported when it would be more generalised.

raster2rgb(in_rast, out_file = NULL, palette = "generic_ndsi_2",
minval = -1, maxval = 1, tmpdir = NA)

## Arguments

in_rast Path of the input multiband raster. (optional) Path of the output RGB JPEG image; if NULL (default), a RasterLayer will be returned. Path of the palette file to be used (cpt or txt), or character value of a builtin palette ("SCL", "NDVI", the default "generic_ndsi" or "generic_ndsi_2"). (to be implemented) the value corresponding to the minimum value of the palette (for now, only -1 is used). A quantile will be also accepted. (to be implemented) the value corresponding to the maximum value of the palette (for now, only 1 is used). A quantile will be also accepted. (optional) Path where intermediate files (VRT) will be created. Default is a temporary directory.

## Value

The path of the output image; alternatively, the output image as RasterLayer (if out_rast = NULL).