This package provides an easy and simple way to read, write and display bitmap images stored in the PNG format. It can read and write both files and in-memory raw vectors.
0.1-7 2013-12-03 o fix endianness issue in writePNG() on big-endian machines when using nativeRaster
0.1-6 2013-07-02 o add support for text tags as well as R object metadata which is serialized into the text field (Thanks to Duncan Temple Lang for the idea)
0.1-5 2013-06-03 o add dpi and asp to writePNG() which allows to store the image resolution or aspect ratio (via the sPHYs PNG tag).
o add info flag to readPNG() which interprets some optional tags to return additional information such as dpi, asp or gamma if stored. o try to detect local libpng via LOCAL_SOFT on Windows. Note that if you use LOCAL_SOFT, you are taking full responsibility over the libraries that png will be linked against.
0.1-4 2011-12-10 o writePNG() now supports binary connection as target and the default target is now raw()
0.1-3 2011-09-02 o remove debugging output
o added a missing call to png_set_interlace_handling to allow libpng to de-interlace images o prevent warnings in readPNG() example for the windows device which is incapable of any transparency
0.1-2 2011-01-19 o support raw array as input to writePNG (RGBA only)
o do not truncate 16-bit images in readPNG() if the resulting output is not nativeRaster o Windows binary on RForge has been updated to libpng 1.5.0
0.1-1 2010-04-06 o add tolerance to writePNG() to avoid shifts by one in color because of numerical representation of discretized values
o adapt to a last-minute change in R 2.11.0 from raster() to rasterImage() o add support for more efficient nativeRaster format
0.1-0 2010-03-17 o first release on CRAN, supports readPNG() and writePNG() for files and raw vectors. readPNG() supports any input color type but will convert to 1-4 planes with 8-bit accuracy each. writePNG() will write out 1-4 planes 8-bit each. writePNG() has currenty no provision for generating or stroring a palette.