- Click Photo Gallery from the menu on the left of your WordPress dashboard.
- From the list under Photo Gallery, click Options.
- Under the General tab find the Image quality option.
- Set a value from 0 to 100 to set the quality of your images.
- Click Save at the top right to save your settings.
Note: This will affect only images that you upload after saving the new Image Quality setting. It will not change the quality of images that are already in your galleries.