[Libreoffice-bugs] [Bug 107986] EDITING: The original size will decrease after using compression

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=107986

--- Comment #9 from Telesto <telesto at surfxs.nl> ---
Created attachment 160192
  --> https://bugs.documentfoundation.org/attachment.cgi?id=160192&action=edit
Example2

1. Open the attached file
2. Open the compress Image dialog 
- Actual dimensions 16,93 x 12,70 cm (nothing 'actual'. It's based on my
screen)
- The apparent dimensions: 16,93 cm c 12,70 ad 95 DPI (dimension suggest 96
dpi)
3. Reduce image resolution: default settings 2001 width x 1500 Height 300 dpi
Lanczos. Jpg compression
4. Press Ok
5. Open the compress dialog again
- Actual dimensions 52,94 cm x 39,69 cm (2001 x 1500px)
- Apparent dimensions: 16,93 x 12,70 cm at 300 dpi
8. Format -> Image -> Properties -> Type Tab
9. Press Original size button (21,00 cm Height x 29,70) -> so limited page
size, A4

So lacking DPI setting in file, it's based on screen DPI. However different
monitors different DPI settings/image sizes. Corel Paint Shop Pro uses a
'default' settings at 200 DPI for images lacking a resolution. Instead of using
the screen resolution as reference.

The different between actual dimensions (suggesting 'real measure') and
apparent dimensions quite confusing at minimum. Also what's meant with
"apparent" dimensions open for debate, IMHO. Increase the size of the image and
the apparent dimensions change (of course) + DPI will be lower. Recompress the
image with "Reduce image resolution" at default settings and you have an image
of 300 DPI with the same dimensions. 

Always using the apparent resolution would solve a part of the problem. Except
I'm not sure what happens on a high DPI screen.. Is there a difference on
screen (Writer/Calc/Draw) between the size of the image on 96 dpi and 120 dpi
screen?

Another solution would be some random - not screen based setting - at say
200dpi (and an option to change it in Expert configuration), if no resolution
is set.

The "actual dimensions" are used the Image Properties Type tab (original size
button) as the "original size' which is misleading at minimum.

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