image_type {readbitmap} | R Documentation |
Identify the type of an image using the magic value at the start of the file
Description
Currently works for png, jpeg, BMP, and tiff images. Will seek to start of file if passed a connection. For details of magic values for files, see e.g. http://en.wikipedia.org/wiki/Magic_number_(programming)#Magic_numbers_in_files
Usage
image_type(source, Verbose = FALSE)
Arguments
source |
Path to file or connection |
Verbose |
Whether to write a message to console on failure (Default
|
Value
character value corresponding to standard file extension of image
format (i.e. jpg, png, bmp, tif) or NA_character_
on failure.
Examples
jpegfile=system.file("img", "Rlogo.jpg", package="jpeg")
image_type(jpegfile)
jpeg_pretending_to_be_png=tempfile(fileext = '.png')
file.copy(jpegfile, jpeg_pretending_to_be_png)
image_type(jpeg_pretending_to_be_png)
unlink(jpeg_pretending_to_be_png)
[Package readbitmap version 0.1.5 Index]