The canvas, the gradient chips and the SVG, PDF, EPS and EMF writers mixed
freeform points in display RGB, while Object > Expand and Create Gradient
Mesh mixed them in the model the points share. Points that are all CMYK,
Gray, Lab or RGB now mix in that model in those places too. Points in
different models mix as before: in display RGB, and on ink planes as the
inks of each point.
This changes how existing art looks:
- CMYK and Lab points. With the default Generic CMYK working space and no
ink planes, halfway between C100 and K100 the canvas drew (17, 106, 139)
and now draws (54, 118, 143).
- RGB points in a working RGB space other than sRGB mix in that space.
- On ink planes (a CMYK document that shows transparency), RGB and Lab
points mix first and then separate.
Gray mixes keep their values, and CMYK and Gray points on ink planes draw
as before. RGB points in an sRGB working space draw as before except on
ink planes.
- PDF and EPS write a gradient whose points are all CMYK, or all Gray in a
CMYK file, as a CMYK image. PDF's Output settings convert it as they
convert any CMYK image.
- Darkening applies to the points before they mix.
- With Appearance of Black set to Rich, the canvas mixes a gradient with a
pure CMYK black point in display RGB, and the point fades from RGB black.
A freeform gradient whose field has no points of its own takes its
colors from the stops, so spot-linked stops in it are written in
process colors too. The export now warns in that case, as it does for
the other gradients drawn as images.
In a Separation color space, the colorant name All marks every plate and
None marks no plate (ISO 32000-1:2008, 8.6.6.4). A spot swatch with one of
those names was written under its own name, so its paint printed on every
plate or on none.
PDF export now writes such an ink as All Spot or None Spot, numbered
All Spot 2, All Spot 3 and on when a spot swatch already has that name,
the same rule EPS export uses. The new name is used for fills and strokes,
tint shadings, DeviceN gradients, colorized images and the Lab alternates.
Registration still writes All.
A gradient of one spot ink's tints and paper white is written as a
Separation shading in that ink, with each white stop at 0% of it. A
white stop linked to a swatch that is not a spot color (a global White
swatch, for example) did not count as paper white. In an RGB document
the spot ink was then dropped: a Classic gradient was written in the
stops' own colors, and a Perceptual one was exported as an image in
process colors.
Such a stop now counts as paper white in the Separation and DeviceN
paths and in the checks that pick them, as an unlinked white stop does.
A stop linked to a white spot color is still a stop of that ink.
A Perceptual linear or radial gradient that mixes spot colors with each
other or with CMYK or gray stops was written as an image in process
colors. It is now written as a DeviceN shading of its inks, with the
stops on its Perceptual curve: at each one, the inks of the two stops on
either side are mixed at the weight where the two colors mixed in
display RGB have the OKLab lightness of the color on the curve.
- Gradient::ink_mixes gives the curve's stops as weights between stops,
under the same 4,096-stop limit as ink_tints.
- Perceptual gradients that mix a spot color with RGB or Lab stops,
dithered fills and freeform gradients stay images, and the warning
now names those cases.
A Perceptual linear or radial gradient was always written as an image,
so a gradient of spot ink tints lost its plate, and no warning named the
spot ink.
PDF export now writes a Perceptual gradient whose stops are tints of one
spot color (and paper white) as a Separation shading in that ink. Its
tints follow the gradient's curve: at each stop the renderer places on
the curve, the tint with the OKLab lightness of the color there.
Dithered fills, freeform gradients and Perceptual gradients that mix a
spot color with other colors are still images, and the export now warns
when such a gradient has stops linked to a spot swatch that its spot
colors are written in process colors.
A linear or radial gradient whose stops mix a spot color with process
colors, or two spot colors, was written in process colors with a
warning. It is now written as a DeviceN shading of the process inks
its stops use and its spot inks, so each spot ink separates onto its
own plate. An off-center midpoint becomes a stop with the inks halfway
between its two stops. A gradient that mixes a spot color with RGB or
Lab colors is still written without the spot ink, with a warning that
says so.
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