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PSSVG(1)			 User commands			      PSSVG(1)

NAME
       pssvg - convert Photoshop(R) gradients to SVG.

SYNOPSIS
       pssvg [-b rgb] [-f rgb] [-h] [-o	file] [-t format] [-v] [-V] file

DESCRIPTION
       The pssvg program converts Photoshop grd5 gradients to the SVG format.
       Unlike most of the other	file formats handled by	the cptutils package,
       grd5 files may contain multiple gradients and all of the	input
       gradients will be converted to gradients	in the output file. One	can
       then use	svgx(1)	to extract single gradients and	convert	them to	other
       formats.

       Photoshop gradient files	will often contain a number of gradients with
       the same	name. These names are used as the basis	for the	SVG titles
       (the id attributes), but	since these must be unique, the	program	will
       append _01, _02,	... to duplicate names in order	to form	the titles.
       Alternatively once can employ the --title option	to generate a uniform
       sequence	of titles.

       Atypically, the input Photoshop grd5 file is a mandatory	argument. The
       program will write to stdout if the --output option is not specified.

OPTIONS
       In the following, all rgb specifications	should be of the form
       red/green/blue where the	colour components are integers in the range 0
       to 255.

       -b, --background	rgb
	   Set the background colour of	the output.

       --backtrace-file	path
	   Specify a file to which to write a formatted	backtrace. The file
	   will	only be	created	if there is a backtrace	created, typically
	   when	an error occurs.

       --backtrace-format format
	   Specify the format of the backtrace written to the files specified
	   by --backtrace-file,	one of plain, xml or json.

       -f, --foreground	rgb
	   Set the foreground colour of	the output.

       -h, --help
	   Brief help.

       -o, --output file
	   Write the output to file, rather than stdout.

       -t, --title format
	   This	option generates the SVG gradient titles (the id attributes)
	   according to	the specified format.

	   The format argument should be a printf(3) format string containing
	   a single integer directive (and that	directive will be replaced by
	   the gradient	number). Thus "gradient-%03i" will produce ids
	   "gradient-001", "gradient-002", ...

       -v, --verbose
	   Verbose operation.

       -V, --version
	   Version information.

EXAMPLE
       Convert a Photoshop gradient, foo.grd, to a set of GIMP gradients,
       foo-001.ggr, foo-002.ggr, ...

	   pssvg -v -t "foo-%03i" -o tmp.svg foo.grd
	   svggimp -v -a tmp.svg

CAVEATS
       The program handles RGB,	HSB, LAB, CMYK and greyscale colour stops,
       converting them all to RGB and then merging the results with the
       opacity channel to create SVG RGBA stops. Conversion of non-RGB stops
       is naive	and takes no account of	colour profiles, so the	results	are
       generally sub-optimal. Integration of a CMS (colour management system)
       into the	program	to perform these conversions is	under investigation.

       The program does	not handle "Book Colours" (PANTONE, COLOR FINDER, etc)
       for legal reasons.

       The SVG output format does not support back/foreground colours;
       consequently, if	the input specifies any	stops with back/fairground
       colours then these will be converted to the colour specified by the
       --background and	--foreground options, respectively.

       The smoothness parameter	used by	Photoshop (which seems to parameterise
       some kind of spline) is not yet handled;	the output contains only
       linear splines (corresponding to	a smoothness of	0%). The result	is
       that the	SVG output will	sometimes look more "angular" than the
       Photoshop input.	Fixing this will require research into the precise
       nature of the spline parameterisation used in the input.

       Noise gradients would seem to be	difficult to convert to	SVG without
       using a huge number of stops in the output, so these will probably not
       be supported by this program.

NOTES
       Adobe Photoshop(R) is a trademark of Adobe Systems Inc.	PANTONE(R) is
       a trademark of Pantone LLC.  COLOR FINDER(R) is a trademark of Toyo Ink
       Mfg. Co., Ltd.

       This program was	written	using the reverse-engineered specification of
       the grd5	format by Valek	Filippov, Alexandre Prokoudine and Michel
       Mariani.

AUTHOR
       J. J. Green

SEE ALSO
       svgx(1).

CPTUTILS		       9 September 2020			      PSSVG(1)

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | EXAMPLE | CAVEATS | NOTES | AUTHOR | SEE ALSO

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