The 'rajasthan.png' file in the f26-backgrounds-extras-base has really obvious JPEG artifacting, and looks really poor on a large screen. This includes banding as well as the ringing artifacts associated with low quality JPEGs.
Hello, Sadly the image was originally submitted with that overlooked artefact from JPEG. Feel free to submit a fixed version so I can update it.
f26-backgrounds-26.2.7-2.fc26 has been submitted as an update to Fedora 26. https://bodhi.fedoraproject.org/updates/FEDORA-2017-45d1400a33
f26-backgrounds-26.2.7-2.fc26 has been pushed to the Fedora 26 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2017-45d1400a33
f26-backgrounds-26.2.7-2.fc26 has been pushed to the Fedora 26 stable repository. If problems still persist, please make note of it in this bug report.