Sorry, but the issue with the picture size is still not working perfectly.

I am using the slider on the index page - but the pictures never are sharp in the slider. at a first sight this makes a very bad impression of the blog.

I tried several times: When I use a slider pic with 1170 px and exported with 100% quality (as you told me to in order to get BEST RESULTS), its not sharp. When I use the same pic with HQ -(2500 px or more, 100 % quality) - its the same: UNSHARP and bad quality in the slider.

Does the theme downsize these slider pics automatically? 

Pls let me know how I can proceed to get better quality results in the slider pics.

website: www.wiederunterwegs.com

at the moment there is the first slider (man with dog and waterfall) in highest quality uploaded- but the pic looks like 70% quality.

Thanks Angelika

Thankyou. It worked. 

1. the posts on the homepage of http://wiederunterwegs.com/_neu under "AKTUELL am blog" (latest posts) shows the text of header not CENTERED, but left-sided. Where can I change this view into CENTERED - just like it is e.g. here: https://www.wiederunterwegs.com/_neu/tag/camping/

2. how should be the size of uploaded pictures in px (longer side) - in order to meet all the requirements of the preinstalled picture sizes of the SOLEDAD theme (for featured slider size, all the other ones...)