Loss of quality image in my bookshelf [solved]

Hello,
In the preview, the images are now of very poor quality and you have to click on them to get better quality. Is it normal ?

The problem is still there, I wonder if it's done on purpose. I try to make nice quality scans, but with the loss of display quality I wonder if it's worth continuing.

Here is a example of a book I added today : https://fr.numista.com/literature/volume.php?id=4590

Hello,
We will fix this. 

Hi, it's fixed.

Hi,I feel it's still compressed and hasn't returned to the same quality as a few weeks ago. The preview has also become smaller. Is this to reduce page loading? 

Example : https://fr.numista.com/literature/volume.php?id=1787

Until a few weeks ago, the page was erroneously loading the full-size picture instead of the thumbnail picture. This was too heavy on some pages and we first made a quick fix to show the 135px thumbnail. The fix of today lets browsers select the most appropriate thumbnail based on the device pixel ratio.

I see that some thumbnails are actually quite blurry. We'll look further into this.

Hello,

We improved the quality of the cover thumbnails.

Way better, thanks a lot !

Are the white edges normal ? 
 

It was not normal. I fixed it.

Have you also reduced the quality of the coin overview? I have the impression that the quality has dropped a little since this change.