A picture of one slide answers a narrower question than the one a theme
picker is asked. What a person wants to know is what a deck will look
like in this theme — all of it, at the size it will be shown, with the
fonts substituted the way they will be. One rendered slide showed one
layout, in content someone then read instead of looking at.
So: a sample deck per theme. Every layout the renderer can draw — title,
bullets with a sub-point, both two-column forms, table, callout, figure,
full-slide figure, section divider, a custom slide with shapes, an arrow
and a chart, and a references slide — with filler text throughout.
Download it, open it, see the theme.
The text is deliberately meaningless. Clinical content in a specimen
invites you to read it, and then you are judging the teaching rather
than the type; that is what the old croup slide got wrong.
No engine. The previous preview needed a Gotenberg round trip and a
pdftoppm to produce a PNG, cached on disk because of what it cost, and
could fail in ways a missing picture cannot explain. python-pptx builds
the file in ~330ms and PowerPoint draws it. The link is a plain anchor,
so it is there whether or not anything on the server is well.
The figure placeholder rides the same path a generated figure does —
attachFigures downgrades a figure slide with no picture to bullets and
an image slide to a section, so without it the sample would silently
stop showing those two layouts.
Verified: all five themes build, 11 slides, the chart is a real chart
and the placeholder embeds as real media.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Dv6sqaY6Vq3ChZHMem3cnU
5f738fbe30