Big issue with homepage images

Hi Anders,

I have issue with the image quality within the homepage : backstretch function does use the featured image original version, and if I use a image optimization tool like TinyPNG (I set 1200px widtdh)

https://www.ads-software.com/plugins/tiny-compress-images/

The quality of image is very bad in the home page. Pretty odd because this compressed image quality is very good (see it in the post page itself with the featured full width image).

Is it the backstrech doing crazy rendering ?

You can see an exemple here https://technobeau.fr/

Post Test #3 is with tinypng (image compressed in 1200px width)
Post Test #2 is with original version (2048px)

Thanks a lot for responding ! And thank you so much for this theme I hope I will run further.

Philippe