https://bugs.documentfoundation.org/show_bug.cgi?id=171940
Bug ID: 171940
Summary: Please improve slide size support (and add the current
powerpoint default size)
Product: LibreOffice
Version: 26.2.1.2 release
Hardware: All
OS: All
Status: UNCONFIRMED
Severity: normal
Priority: medium
Component: Impress
Assignee: [email protected]
Reporter: [email protected]
The default slide size currently used in powerpoint is 33.867 cm × 19.05 cm.
This is not a "named" size in libreoffice, which makes it confusing when
exchanging slides with powerpoint users. For instance, importing pptx will
report "custom" (i.e. unrecognized) as the slide size.
Another problem is that currently, in LibO "wide" (16:9 and 16:10) slide
formats are obtained by trimming off some vertical space from the 4:3 format.
This is the same approach that powerpoint has historically taken. In 2010 MS
introduced the widescreen slide format precisely by trimming off vertical space
from the 4:3 format. Specifically, from 25.4 cm × 19.05 cm (4:3) they obtained
25.4 cm × 14.29 cm (16:9). Incidentally, these are both "named" sizes in
impress.
Notably, later on (in 2013) MS recognized that this was a mistake and the new
33.867 cm × 19.05 cm comes precisely from that realization. The 16:9 slide
format is now obtained by *adding* horizontal space from the 4:3 format, and
not by removing vertical space!
Having 16:9 slides that are *smaller* than the 4:3 slides makes it extra hard
to reuse content originally prepared in the 4:3 format in modern slides.
A final problem is that the naming of named slide sizes is extra confusing.
- "Screen 4:3", "Screen 16:9" and "Screen 16:10" are the impress slide size
names;
- "On-Screen Show (4:3)", "On-Screen Show (16:9)", "On-Screen Show (16:10)" are
the powerpoint 2010 slide formats.
That "On-Screen Show" specifier is not helpful at all (does not let one
recognize the powerpoint formats and suggests that the default formats are not
for "shows").
May I suggest:
- "Screen 4:3", "Screen 16:9" and "Screen 16:10" kept as the standard impress
slide size names
- "Screen 16:9 wide" and "Screen 16:10 wide" as formats derived from the
standard 4:3 by making it wider
- "Screen 4:3 compatible", "Screen 16:9 compatible, "Screen 16:10 compatible"
as the powerpoint 2010 and google documents presentation sizes (those currently
named "On-Screen Show (...)"
- "Screen 16:9 compatible, wide" and "Screen 16:10 compatible, wide" as the
powerpoint >= 2013 size.
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