Hi,
What do you mean with "blurry" ? Could you be more precise on which images you have a problem ?
HikaShop could generate thumbnails and these thumbnails are generated using the GD library with a high level of compression. The compression could affect the quality of the image.
But it affect only thumbnails, not the images that you uploaded.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.