aleleba/vectorcraft
1
0
Fork 0
mirror of https://github.com/storytold/vectorcraft.git synced 2026-10-31 13:17:19 -06:00
Code Issues Packages Projects Releases Wiki Activity

Overprint Preview: overprinting draws with Darken, so a colour over itself stays that colour (#2415)

Browse Source 
Multiply squared a colour overprinting itself (stroke over same-colour fill showed a darker band). Darken keeps the stronger ink per plate/channel.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
vangel76
2026-10-17 13:06:51 +07:00
committed by bflatastic
co-authored by Claude Opus 5.5
parent 8ac4c9d268
commit 7e423f91e9
7 changed files with 43 additions and 23 deletions
Download Patch File Download Diff File Expand all files Collapse all files
docs/mcp.md
+2 -2
View File
@@ -1107,7 +1107,7 @@ Each fill and stroke (and each character's fill and stroke) can overprint: its i
of knocking them out. `object.setOverprint {fill?, stroke?, item?, ids?}` sets it (groups set their contents, type its
characters too; `item` aims at one appearance item) and `attributes.info {ids?}` reads it back (`null` where the
objects differ). Overprint Preview (`view.overprintPreview`) and Separations Preview show it; rendering approximates
it by multiplying. Older files that listed Overprint Black objects in the document get the flags on load.
it by darkening (the stronger ink of each plate wins, so a colour overprinting itself stays that colour). Older files that listed Overprint Black objects in the document get the flags on load.
PDF export writes them with `advanced.overprint: "preserve"` (the default): each overprinting fill and stroke sets a
graphics state with `/OP true /op true /OPM 1` (`/OPM 0` in PDF/A). With `discardWhiteOverprint` (`document.setup`, on by
default) white ones knock out instead; `"discard"` writes none.
@@ -3049,7 +3049,7 @@ The Print dialog's Advanced section and the printer profile are print settings t
`file.print`): `advanced: {printAsBitmap, overprints: preserve|discard|simulate, flattenerPreset}` and `color:
{profile}`. In composite output, `preserve` writes overprinting fills and strokes with an overprinting graphics state
(`/OP`, as PDF export does), `discard` makes overprinting fills and strokes knock out and `simulate` prints them
as Overprint Preview shows them (multiplied); either way the file has no overprint left. Separations always keep
as Overprint Preview shows them (darkened); either way the file has no overprint left. Separations always keep
overprints. `flattenerPreset` (High Resolution, Medium Resolution, Low Resolution or a saved preset,
`flattener.presets.list`) flattens transparency before printing, as Object → Flatten Transparency does; empty, a
PDF keeps it live (PostScript, which has none, uses `file.print`'s `flattenerPreset`, else this one, else medium).