Bad Quality of product pictures

-- HikaShop version -- : 5.0.2
-- Joomla version -- : 4.2
-- PHP version -- : 8.1
-- Browser(s) name and version -- : all
-- Error-message(debug-mod must be tuned on) -- : Quality of product pictures

Dear team, I have been trying for some time to display images in sharp focus both in the category view and on the product page. Although the quality/resolution of the original images is very good, I only get a reduced quality display.
My setting for product images is e.g. 350 x 350px, the sharp original image also has this size, but no longer when it is displayed as a product image.
Is there a setting that allows me to show the images accordingly without losing any quality?
Thanks in advance
Anja

Hi,
Did you set something in: Hikashop > Systems> Configuration > Images: Image resize during upload (width x height) ?
If you did, delete what you have there and just use a program like FastStone Resizer to resize bulk images and keep them HQ with small size for files.

Hi, thank you for your answer,
but I do not find any button in the configuration, that would allow an image resize?
And I dont want to resize the pictures, they are already optimized for that purpose..

Hikashop > Systems> Configuration > Images: Image resize during upload (width x height) ?

Okay, thank you, but this button is missing in my backend?