image_type: Identify the type of an image using the magic value at the...
In jefferis/readbitmap: Simple Unified Interface to Read Bitmap Images (BMP,JPEG,PNG,TIFF)
Description
Usage
Arguments
Value
Examples
View source: R/read-any-bitmap.R
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
1
image_type(source, Verbose = FALSE)
Arguments
source
Path to file or connection
Verbose
Whether to write a message to console on failure (Default
FALSE)
Value
character value corresponding to standard file extension of image
format (i.e. jpg, png, bmp, tif) or NA_character_ on failure.
Examples
1
2
3
4
5
6
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)
jefferis/readbitmap documentation built on May 19, 2019, 3:57 a.m.
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Description Usage Arguments Value Examples
View source: R/read-any-bitmap.R
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
1 | 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
1 2 3 4 5 6 | 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)
|
R Package Documentation
Browse R Packages
We want your feedback!
Note that we can't provide technical support on individual packages. You should contact the package authors for that.
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