Write one or more bitmap images in TIFF format
Writes images into a TIFF file or a raw vector representing such.
writeTIFF(what, where, bits.per.sample = 8L,
compression = c("LZW", "none", "PackBits", "RLE", "JPEG", "deflate"),
reduce = TRUE)what |
either an image or a list of images. An image is a real matrix
or array of three dimensions, or an object of the class |
where |
file name or a raw vector |
bits.per.sample |
number of bits per sample (numeric scalar). Supported values in this version are 8, 16, and 32. |
compression |
desired compression algorithm (string). Optionally, it can be specified as a numeric value corresponding to the compression TIFF tag, but it needs to be also supported by the underlying TIFF library |
reduce |
if |
By default writeTIFF uses the same number of planes as
there are planes in the input image. For native images it is always
four unless reduce = TRUE is set (see above). Consequently,
color maps are not used. The output always uses contiguous planar
configuration (baseline TIFF). The output is tagged with a photometric
tag of either RGB (3 or 4 planes) or zero-is-black (1 or 2 planes). If
what is a list then the TIFF output will be a directory of the
corresponding number of images (in TIFF speak - not to be confused
with file directories).
If where is a raw vector then the value is the raw vector
containg the TIFF contents, otherwise a scalar integer specifying the
number of images written in the file.
Simon Urbanek
img <- readTIFF(system.file("img", "Rlogo.tiff", package="tiff"))
# write without the alpha channel
tiff <- writeTIFF(img[,,-4], raw(0))
# read as native
i2 <- readTIFF(tiff, native=TRUE)
# write reduced - should be the same as tiff
t2 <- writeTIFF(i2, raw(0), reduce=TRUE)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.