wallpapers in my Ubuntu 13.04 have low resolution

[Tommy_CZ]

The wallpapers in Ubuntu 13.04, although they are the "entrance of user experience" and "eye candy" in Ubuntu, they have bad technical quality, high amount of noise, high compression ratio probably, low resolution.
I know Ubuntu has some instructions to uploading wallpapers, like resolution etc., but they are not followed.
Landing wallpaper has 2048x1152 resolution, but high compression ratio making it ugly.
the "Fleurs de Prunus 24", official wallpaper too, has resolution 1024x683 (!!!).
I think there can be inspiration taken from Luna OS wallpapers, Gnome 3... (and of course windows and osx).

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: ubuntu-wallpapers 13.04.0daily13.03.20-0ubuntu1
ProcVersionSignature: Ubuntu 3.8.0-19.30-generic 3.8.8
Uname: Linux 3.8.0-19-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.9.2-0ubuntu8
Architecture: amd64
Date: Wed May 15 09:31:10 2013
Dependencies: ubuntu-wallpapers-raring 13.04.0daily13.03.20-0ubuntu1
InstallationDate: Installed on 2013-02-25 (78 days ago)
InstallationMedia: Ubuntu 12.04.2 LTS "Precise Pangolin" - Release amd64 (20130213)
MarkForUpload: True
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=cs_CZ.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-wallpapers
UpgradeStatus: Upgraded to raring on 2013-04-02 (42 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.