const char *kkhelp="png2pdf - A converter from PNG to PDF\n\
=====================================\n\
\n\
Usage:\n\
\n\
png2pdf	-h\n\
png2pdf --help\n\
\n\
	shows this help text.\n\
\n\
png2pdf -v\n\
png2pdf --version\n\
\n\
	shows version information\n\
\n\
png2pdf -c <options>\n\
png2pdf --configure <options>\n\
\n\
	sets permanent options. See below for options you can set\n\
\n\
png2pdf -C\n\
png2pdf --show-configuration\n\
\n\
	shows the current set of permanent options.\n\
\n\
png2pdf -u\n\
png2pdf --unconfigure\n\
\n\
	removes the permanent options.\n\
\n\
png2pdf -r <options>\n\
png2pdf --reset <options>\n\
\n\
	temporarily overrides the permanent options.\n\
\n\
Options:\n\
--------\n\
\n\
-p <pdf-level>\n\
--pdf <pdf-level>\n\
\n\
	specifies the PDF level. Maybe 1.2, 1.3 or 1.4.\n\
\n\
-m <background-rgb>\n\
--mix-background <background-rgb>\n\
\n\
	mixes against the background contained in the file's background\n\
	chunk or against the specified background color if the file\n\
	doesn't have a background chunk.\n\
\n\
-s \n\
--mix-specified[=bool]\n\
\n\
	sets the background specified in the -m option to have\n\
	higher priority than the background from the file's background chunk.\n\
\n\
-i\n\
--image-mask[=bool]\n\
\n\
	writes an image mask based on the PNG file's alpha channel\n\
	if available.\n\
\n\
-a\n\
--transparency[=bool]\n\
\n\
	writes transparency data based on the PNG file's alpha channel\n\
	if available.\n\
\n\
-l\n\
--invert-levels[=bool]\n\
\n\
	inverts the decision level for image mask creation. Normally\n\
	only pixels having 0 opacity are masked out. This option\n\
	masks all pixel having opacity in range 0...254.\n\
\n\
-t\n\
--alpha-transparency[=bool]\n\
\n\
	treats the alpha channel data as transparency. By default the\n\
	alpha channel is treated as opacity data.\n\
\n\
-f\n\
--file-time-check[=bool]\n\
\n\
	When running on a directory we do it in make style. A new PDF\n\
	file is created only for those PNG files which are newer\n\
	than the appropriate PDFs.\n\
\n\
Examples:\n\
---------\n\
\n\
png2pdf -c -p 1.4\n\
	sets PDF format level to 1.4.\n\
\n\
png2pdf -m 255,255,255 x.png x.pdf\n\
	converts x.png to x.pdf. If x.png has a background chunk the color\n\
	from that chunk is used for color mixing, otherwise we mix\n\
	against a white background.\n\
\n\
png2pdf -m 204,204,255 -s x.png x.pdf\n\
	converts x.png to x.pdf mixing against a light blue background\n\
	regardless whether or not there is a background chunk in the file.\n";
