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fix: a picture prints as the picture, where and as large as the teacher asks

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The black bars above and below a printed picture were neither in the
picture nor in the layout. A PNG or JPEG in a tab of its own is shown by
the engine on a viewer page whose background is rgb(14, 14, 14), and Qt
prints page backgrounds by default; 0.2.6.1 printed that page.

A picture is now taken as itself — drawn onto white, capped at 300 dpi
across Letter — and laid out on the printer's paper by the preview, with
Size (as large as fits down to 25%), Position (nine squares), Paper
(automatic, upright, sideways) and Fill the whole page, which says it
cuts the edges off and is never the default. The preview is the PDF that
prints, laid out again after each change. Worksheet PDFs and lesson pages
get no picture controls and are unchanged.

Page backgrounds are no longer printed for lesson pages either, as in
Chrome; Blink darkens light text when it does that, so a white-on-black
page prints readable grey on white. "Colour" is "Color" in the print
interface and the manual.

Lab: 135 print checks, now including eight picture layouts measured on
the job file CUPS kept — byte-identical to the preview, within 1 point of
where asked, no ink anywhere else. Printed from the real session with the
pointer: 50% top left, Elmer-66, the same. Not yet on paper.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
This commit is contained in:
ekklesia
2026-09-23 21:41:15 -05:00
co-authored by Claude Opus 5.5
parent 6946bae455
commit 940f63e0e5
10 changed files with 662 additions and 13 deletions
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docs/manual/50-wonderink.md
+8 -1
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@@ -36,7 +36,14 @@ and choose **Print…**. You will see the pages exactly as they will print.
* Choose **Only some pages** to print, for example, `2` or `1-3`.
* Set **Copies** for the number of children.
* Choose **Black and white** to save colour ink.
* Choose **Black and white** to save color ink.
**Printing a picture.** When the tab is a picture on its own, the
preview also shows **Picture**: choose its **Size** (for example 50%),
click one of the nine **Position** squares to put it in a corner or the
middle, and choose **Paper** upright or sideways. The preview changes as
you choose, and shows exactly what will print. **Fill the whole page**
makes it cover the paper but cuts off the edges.
Click **Print**. Wonder Ink says when the printer has it and goes back to
the lesson. **Cancel** prints nothing.