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, bigtiff = FALSE, tmpdir = NA )
in_rast | Path of the input multiband raster. |
---|---|
out_file | (optional) Path of the output RGB JPEG image; if NULL (default), a RasterLayer will be returned. |
palette | 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"). |
minval | (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. |
maxval | (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. |
bigtiff | (optional) Logical: if TRUE, the creation of a BigTIFF is forced (default is FALSE). This option is used only in the case a GTiff format was chosen. |
tmpdir | (optional) Path where intermediate files (VRT) will be created.
Default is a temporary directory.
If |
The path of the output image; alternatively, the output image
as RasterLayer (if out_rast = NULL
).
License: GPL 3.0