rchk issuesrchk errors on CRAN for
resubmission{colorfast} for fast color lookupcolorraw vectorstrns PNG transparencyread_png() to read a PNG from a file or a raw
vectorwrite_png() to write data as a PNG file or PNG data in
a raw vectorget_png_info() - interrogate a vector of raw values
containing a PNG image to determine image information i.e. width,
height, bit_depth, color_type, compression_method, filter_method,
interlace_method.Supported R image types:
#RRGGBBAA or #RRGGBB. Note: R
color names are not supported here.fmt and flags for PNG
decoding
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