Magento – Magento 2: How to filter category by store id

Instead of store filter, try with root category filter.

$rootcatID = Mage::app()->getStore()->getRootCategoryId();

$productCollection = Mage::getResourceModel('catalog/product_collection')
->joinField('category_id','catalog/category_product','category_id','product_id=entity_id',null,'left')
->addAttributeToFilter('category_id', array('in' => $rootcatID))
->addAttributeToSelect('*');

$productCollection->load();

Try this:

        $products = Mage::getModel('catalog/category')->load($category_id)->getProductCollection();
        $products
              ->addAttributeToSelect('name')
              ->addAttributeToSelect('price')
              ->addFinalPrice()
              ->addAttributeToSelect('small_image')
              ->addAttributeToSelect('image')
              ->addAttributeToSelect('thumbnail')
              ->addAttributeToSelect('short_description')
              ->addUrlRewrite()

              //select color too
              ->addAttributeToSelect('color')
              ->addAttributeToFilter(array(
                 array('attribute'=> 'color','eq' => '27')
                ))
              ;