Generic CMYK's tone curves now pass through the CGATS TR 001 tone value
increase of each ink at 40% and 50% (C 20.0, M 17.6, Y 16.8, K 21.6 at
50%), and its 16 Neugebauer primaries mix linearly, so a single ink's
tints gain as TR 001 gives. The 300% ink limit stays. The primaries, the
black-generation curve and the black point are VectorCraft's own values.
- The black point is 90% black under neutral CMY that fills the ink
limit: sRGB black separates to C75 M68 Y67 K90 instead of C67 M67 Y67
K100.
- Black follows a curve over the gray component of the black-free
solve, raised by how far that solve stays lighter than the target.
Grays from sRGB 177 up carry no black, and sRGB 128 gray separates to
C50.5 M42.2 Y42.0 K7.5 instead of C38.8 M26.3 Y29.9 K24.4.
- Display of CMYK fills, swatches and imported CMYK values and the
separation of RGB and Lab colors use the same model.
Paper white still separates to C0 M0 Y0 K0, but other separations
change, and so does the display of CMYK colors with ink. Tests that held
numbers of the old model are updated.
The Generic CMYK solver clamps each ink to 0..1 after a step. When an
ink sits at 0 or 1 and the step pushes it further out, the clamp
removes most of the step, and the solve can stop after a step under
1e-6. Where it stopped depended on the input's last float bits. For hex
ed1e79, magenta ranged from 93.2% to 93.9% and yellow from 15.3% to
16.3% over 4,001 f32 values of its red, with 230 jumps over 0.001
between neighboring values.
An ink at 0 or 1 whose descent direction points out of the range now
stays where it is, and the step moves the other inks. The solve stops
when every ink is held. Two new tests step a channel one f32 at a time
and check that every ink stays within 0.001: the red of ed1e79 (cyan
held at 0) and the blue of sRGB (0, 0, 0.25) (cyan and magenta held at
1).
The solver still minimizes plain Lab distance to the gamut-mapped
target. The CMYK values of many RGB colors change; hex 00ff00 now
separates to C=61 M=0 Y=100 K=0 (cyan 0.6235 before, 0.6064 now), and
the swatch test that pins its name is updated.
A paint linked to the built-in Registration swatch is no longer relinked
to a new global swatch of the same color, so it keeps printing on every
plate. The same rule applies to New Color Group from artwork with
global swatches.
Add Used Colors, New Color Group from artwork and Select All Unused
looked up each linked paint's swatch by searching every swatch. They now
build one map of swatch names first, with the built-in Registration
swatch, and the first swatch of each name as before.
New tests and test cases: New Color Group from artwork with repeated,
near-equal and -0.0 colors, a Registration link and names that need
numbering, and New Swatch and Edit Color Group with near-equal and
-0.0 colors; each checks the names, their order and one undo step.
New Swatch with several colors, New Color Group and Edit Color Group's
extra colors searched every swatch and group for each candidate name
of each new swatch. They now build the set of taken names once
(FreeSwatchNames, with take_new for New Swatch's default names and
insert for the group name and the group's own swatches) and keep it up
to date as they add swatches. The names they give are unchanged.
swatch.unused grouped the gradients in use by their stop colors and
compared each gradient swatch with every gradient in its group, so
gradients that share stop colors but differ in offsets, midpoints,
opacity, kind, method, dither or links still took quadratic time. Each
gradient now has a key that is equal exactly when the gradients are
equal: kind, method, dither, and each stop's offset, color, opacity,
midpoint, link, tint and process plates. The gradients in use go into
one hash set, and each gradient swatch is looked up in it.
swatch.addUsedColors and swatch.unused searched lists inside loops over
colors and swatches, checking each color against every color or swatch
before it. They now keep the same ordered lists and use hash sets and
maps for membership and lookup. A color's key is its model and the bits
of its components with -0.0 read as 0.0, so the key agrees with `==`; a
color with a NaN component matches nothing, as before.
Add Used Colors names its new swatches through
Document::free_swatch_names, which collects the taken swatch and color
group names once and gives the same names free_swatch_name gives when the
swatches are added one at a time. The added swatches, their names, order
and links, the undo step, and the swatches Select All Unused lists are
unchanged.
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