No standard color/grayscale mapping due to ColorMode instead of ColorModel

[ValdikSS]

Foomatic database of foo2zjs driver set uses ColorMode option to choose color or grayscale (monochrome) printing, but the standard option is ColorModeL.
This prevents selecting color/grayscale printing using standard CUPS printing options, and also makes it impossible to choose over IPP.

Issues:

1. ColorMode is used instead of ColorModel, which prevents mapping of the color space by CUPS
2. The value name is Monochrome instead of Gray (or Black), which is not a known-good name according to CUPS scheduler/colorman.c
3. The value name is Color for color, which is also not valid (CUPS expects RGB or CMYK or DeviceN)

foo2zjs/foomatic-db/opt/foo2hbpl2-ColorMode.xml

Lines 21 to 27 in 43b8bfa

	<enum_val id="ev/foo2hbpl2-ColorMode-mono">
	<ev_longname> <en>Monochrome</en> </ev_longname>
	<comments><en>
	Prints in monochrome only
	</en></comments>
	<ev_shortname> <en>Monochrome</en> </ev_shortname>
	<ev_driverval></ev_driverval>

Possible solutions:

1. Patch foo2zjs foomatic DB to use ColorModel and add Gray/RGB, regenerate all PPD files
2. Patch cups-filters cups-filters/filter/foomatic-rip to map ColorModel to ColorMode (will CUPS behave without ColorModel Gray/RGB in the PPD though?)

I don't know the reason behind using this exact option name. It was probably done on purpose.

@tillkamppeter thoughts?

[tillkamppeter]

I suggest to do (1) here, to use the option name "ColorModel" in the driver as this name is PPD file standard. Also the names "Gray" and "RGB" are standard names.

Adding exception handling to foomatic-rip only leads to a lot of clutter, as you will add further exceptions later.

[ValdikSS]

zjs uses different color printing modes, need to think on how to remap it

foo2zjs/foomatic-db/opt/foo2zjs-ColorMode.xml

Lines 85 to 93 in 43b8bfa

	<enum_val id="ev/foo2zjs-ColorMode-PhotoOnly">
	<ev_longname> <en>Color - Photo Only</en> </ev_longname>
	<comments><en>
	Prints with full usage of color.
	Black will be mixed with color toner.
	Not useful for text or large black areas.
	</en></comments>
	<ev_shortname> <en>PhotoOnly</en> </ev_shortname>
	<ev_driverval>-c -C1</ev_driverval>

foo2zjs/foomatic-db/opt/foo2zjs-ColorMode.xml

Lines 139 to 146 in 43b8bfa

	<enum_val id="ev/foo2zjs-ColorMode-PhotoAndText">
	<ev_longname> <en>Color - Photos and Text</en> </ev_longname>
	<comments><en>
	Prints without adding color to black.
	Makes sharp text and colorful photos.
	</en></comments>
	<ev_shortname> <en>PhotosAndText</en> </ev_shortname>
	<ev_driverval>-c -C2</ev_driverval>

foo2zjs/foomatic-db/opt/foo2zjs-ColorMode.xml

Lines 192 to 201 in 43b8bfa

	<enum_val id="ev/foo2zjs-ColorMode-GraphicAndText">
	<ev_longname> <en>Color - Graphics and Text</en> </ev_longname>
	<comments><en>
	Best mode for everyday printing.
	Also usable for photos, but reduces color under black pixels.
	Very dark areas will printed with black only.
	Produces nice Gray without Color shining.
	</en></comments>
	<ev_shortname> <en>GraphicsAndText</en> </ev_shortname>
	<ev_driverval>-c -C3</ev_driverval>

Other drivers don't have this.