A process color can't colorize a grayscale image that has an alpha channel,
and paint.setFill refuses that combination. Remove Background gave such an
image an alpha channel and kept its process colorize color. It now refuses
the run, changing nothing, when an image it is given is gray and colorized
with a process color. It checks this before any image is decoded. Another
image in the document that already has that combination does not affect a
run on other images. Black, white and spot colors still colorize the result.
The rule check_colorized applies to each image is now one function,
paint::gray_colorized_with_process, which both checks call.
Docs: docs/mcp.md (Remove Background), docs/target-app-parity.md.
In distance mode, each pixel took a square root for every background color.
The nearest color is now found by squared distance, and only that distance is
converted to a percentage. The levels do not change.
A new built-in add-on, Image Tools (Object › Plug-ins › Image Tools),
adds Remove Background… (`addon.image.removeBackground`). It makes the
background of the selected images transparent by lowering the alpha of
their own pixels, in one undo step, with no service or model. The
background is the most common color along the image's edges, the
average of the image's corners, or colors the user picks. Contiguous
(on by default) clears it only where it reaches in from an edge; off,
it is cleared wherever it is. Tolerance and Softness (0 to 100, 10 by
default) set how near a color must be to be cleared and the band over
which pixels fade out. Match measures that nearness as the RGB
distance or as the largest difference on one channel. It is a
VectorCraft addition.
- The image stays an image: an embedded PNG with alpha, the source's
ICC profile and resolution, and 16 bits or gray when the source is.
A linked image is embedded and keeps its Placement Options.
- When the edges hold at least as many clear pixels as pixels of their
most common color, edge mode clears nothing, so a second run leaves
the subject alone. Corner mode leaves clear corners out of the
average and clears nothing when all four are clear.
- With Match set to Each Channel, a tolerance of t / 255 × 100 clears
the colors within t 8-bit steps on every channel.
- A CMYK image, a linked image that shows its preview, an image that
would need more than the decode allowance (checked from its header)
and a result with no pixel left are refused, and the document stays
as it was. When no pixel changes, no undo step is added. The result
reports `cleared`, the pixels made fully clear.
- Picked colors are hex colors, with or without `#`, or black, white,
red, green or blue.
- The dialog opens with Preview off; with Preview on, the canvas shows
the result, and Cancel puts the image back. While the dialog
previews, the session keeps the images' decoded pixels (at most
128 MiB, 32 MiB in the web app) so each preview step does not decode
them again, and releases them when the dialog closes with OK or
Cancel. A run that is not a preview step keeps nothing.
Docs: docs/mcp.md (Image Tools add-on), docs/target-app-parity.md.
dotCooCoo