Usage
nearblack(infile, o, of, co, white, color, near, nb, setalpha, setmask, q,
output_Raster = FALSE, overwrite = FALSE, ignore.full_scan = TRUE,
verbose = FALSE)
Arguments
infile
Character. The input file. Any GDAL supported format, any number of bands, normally 8bit Byte bands.
o
Character. outfile. The name of the output file to be created. Newly created files are created with the HFA driver by default (Erdas Imagine - .img)
of
Character. format. (GDAL 1.8.0 or later) Select the output format. Use the short format name (GTiff for GeoTIFF for example).
co
Character. "NAME=VALUE". (GDAL 1.8.0 or later) Passes a creation option to the output format driver. Multiple -co options may be listed. See format specific documentation for legal creation options for each format. Only valid when creating a new file.
white
Logical. Search for nearly white (255) pixels instead of nearly black pixels.
color
Numeric. c1,c2,c3...cn. (GDAL >= 1.9.0) Search for pixels near the specified color. May be specified multiple times. When -color is specified, the pixels that are considered as the collar are set to 0.
near
Numeric. dist. Select how far from black, white or custom colors the pixel values can be and still considered near black, white or custom color. Defaults to 15.
nb
Numeric. non_black_pixels. number of non-black pixels that can be encountered before the giving up search inwards. Defaults to 2.
setalpha
Logical. (GDAL 1.8.0 or later) Adds an alpha band if the output file is specified and the input file has 3 bands, or sets the alpha band of the output file if it is specified and the input file has 4 bands, or sets the alpha band of the input file if it h
setmask
Logical. (GDAL 1.8.0 or later) Adds a mask band to the output file, or adds a mask band to the input file if it does not already have one and no output file is specified. The mask band is set to 0 in the image collar and to 255 elsewhere.
q
Logical. (GDAL 1.8.0 or later) Suppress progress monitor and other non-error output.
output_Raster
Logical. Return outfile as a RasterBrick?
overwrite
Logical. If output file exists, OR if output file is not set (which would defualt to overwriting the input file), allow overwriting?
ignore.full_scan
Logical. If FALSE, perform a brute-force scan if other installs are not found. Default is TRUE.
verbose
Logical. Enable verbose execution? Default is FALSE.