By default, Zoomforth optimizes images for viewing on a website. This means resizing them and compressing them for faster load times for users.
Compression is the process of converting an image file in such a way that it consumes less space than the original file by reducing the size of the image file without affecting or degrading its quality too much.
For some larger images, this might not be ideal as it could lead to a blurry look on larger images, especially small crops on larger images.
However, you can disable our compression logic for that particular image by checking the box next to "Use uncompressed image":
For guidance on how image quality affects tile display, see the best practices for images in Zoomforth tiles.