[Libreoffice-bugs] [Bug 107154] presentation output resolution in 16/ 9 mode seems to be 720p only, need an option to push it at least to 1080p ?

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=107154

--- Comment #4 from stievenard.david at gmail.com ---
tell me if I'm wrong but 

resolution :
- is an absolute value :
- it's the number of pixels in x and y
- it's expressed using this notation X * Y
- if the pixel aspect ratio is it drives the media ratio aspect, if x/y = 16/9
- classic resolutions in 2017 are 720p=1280*720 px / 1080p=1920*1080 px /
4k=3840*2160 px


pixel density :
- is a relative value :
- it's the result of the resolution applied to a physical support : screen,
paper...so it depends on the physical support
- it's express in DPI (dot per inch) or PPI (pixel per inch)
- it's basically giving you the size of each pixel resulting of the number of
pixels in the source media applied to the support



I had a 2nd look at the compress image menu and it's quite confusing (on an
image, right click / compress...)

"resolution"
- bellow the width and height there is "resolution" expressed in DPI, this is
wrong, this is pixel density.
- Pixel density depends on the physical support, I choosed 16/9 screen, how
impress can give me a pixel density if I don't specify the size of the support
?
- Why would someone use the pixel density ?
  - it seems to me quite impossible to predict on what support I'll have to
show the presentation
  - pixel density is interesting value when combined with the distance of
viewing (large LCD screen have very low dpi but from far away it's ok) so this
is irrelevant for a presentation in a meeting room where in 2017, a 16/9
"screen" will be 720p 1080p or 4k anyway. so the maximum picture quality you
can get out of the presentation is to have : 1 pixel on the picture = 1 pixel
on the screen


I think I have the explanation of this : it seems that these calculations are
based on the "slide paper size" (available in slide properties) and when you
select : screen 16/9" the default size of "virtual 16/9 paper" is 28cm*15.75cm 


1/ question
when using a 1920*1080px picture on a 1080 display will impress display this
picture in it's native resolution ?


2/ suggestion
work with resolutions, a nice feature could be able to correct all pictures in
one click. For that you'll need
- to set the presentation resolution
- picture resolution
- a picture quality setting
- the position on the screen

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