Hi,
We do not have an option (yet) for that but you can already set that limitation in HikaMarket.
For the moment you need to edit the file "components/com_hikamarket/controllers/product.php" and replace
if($vendor_id > 1)
$options['sub_folder'] = 'vendor'.$vendor_id.DS;
By
if($vendor_id > 1) {
$options['sub_folder'] = 'vendor'.$vendor_id.DS;
$options['max_file_size'] = 400*1024; // 400K
}
in order to set the max file size that the vendor have the right to upload in the front-end.
About the parameters for the image, the HikaShop image configuration is used for that, so if you put a restriction for your vendors, it will restrict your uploads in the backend too.
Regards,