NEWS in package ‘png’

---

Changes in version 0.1-8 (2022-11-29)

• minor change to avoid protect and registration warnings

Changes in version 0.1-7 (2013-12-03)

• fix endianness issue in writePNG() on big-endian machines when using nativeRaster

Changes in version 0.1-6 (2013-07-02)

• 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)

Changes in version 0.1-5 (2013-06-03)

• add dpi and asp to writePNG() which allows to store the image resolution or aspect ratio (via the sPHYs PNG tag).
• add info flag to readPNG() which interprets some optional tags to return additional information such as dpi, asp or gamma if stored.
• 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.

Changes in version 0.1-4 (2011-12-10)

• writePNG() now supports binary connection as target and the default target is now raw()

Changes in version 0.1-3 (2011-09-02)

• remove debugging output
• added a missing call to png_set_interlace_handling to allow libpng to de-interlace images
• prevent warnings in readPNG() example for the windows device which is incapable of any transparency

Changes in version 0.1-2 (2011-01-19)

• support raw array as input to writePNG (RGBA only)
• do not truncate 16-bit images in readPNG() if the resulting output is not nativeRaster
• Windows binary on RForge has been updated to libpng 1.5.0

Changes in version 0.1-1 (2010-04-06)

• add tolerance to writePNG() to avoid shifts by one in color because of numerical representation of discretized values
• adapt to a last-minute change in R 2.11.0 from raster() to rasterImage()
• add support for more efficient nativeRaster format

Changes in version 0.1-0 (2010-03-17)

• 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.