Description Usage Arguments Value Note Author(s)
Internal function to create JPEG images from a multiband raster file. This function is used by s2_thumbnails, and it will be exported when it would be more generalised.
1 2 |
in_rast |
Path of the input multiband raster. |
out_file |
(optional) Path of the output RGB JPEG image; if NULL (default), a RasterBrick will be returned. |
bands |
(optional) 3-length integer argument, with the position of the three bands to be used respectively for red, green and blue. |
minval |
(optional) the value corresponding to black (default: 0). Also a 3-length vector is accepted (min values for red, green and blue respectively). |
maxval |
(optional) the value corresponding to white (default: 10000). Also a 3-length vector is accepted (max values for red, green and blue respectively). |
format |
(optional) Format of the output file (in a format recognised by GDAL). Default is JPEG. |
compress |
(optional) In the case a GTiff format is present, the compression indicated with this parameter is used. In the case a JPEG format is present, the compression indicates the quality (integer, 0-100). In the case a GTiff format is presentand an integer 0-100 number is provided, this is interpreted as the quality level of a JPEG compression. |
tmpdir |
(optional) Path where intermediate files will be created. Default is a temporary directory. |
The path of the output image; alternatively, the output image
as RasterBrick (if out_rast = NULL
).
License: GPL 3.0
Luigi Ranghetti, phD (2018) ranghetti.l@irea.cnr.it
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