Leverage browser caching issue I added some lines in my .htaccess file, following Is it possible to leverage browser caching?, but Page speed tool still throws "Leverage browser caching error." for only images.
Read this article about Leverage Browser Caching for Images, CSS and JS.

Add these lines to your .htacess file.

## EXPIRES CACHING ##
&lt;IfModule mod_expires.c&gt;
ExpiresActive On
ExpiresByType image/jpg "access 1 year"
ExpiresByType image/jpeg "access 1 year"
ExpiresByType image/gif "access 1 year"
ExpiresByType image/png "access 1 year"
ExpiresByType text/css "access 1 month"
ExpiresByType application/pdf "access 1 month"
ExpiresByType application/javascript "access 1 month"
ExpiresByType application/x-javascript "access 1 month"
ExpiresByType application/x-shockwave-flash "access 1 month"
ExpiresByType image/x-icon "access 1 year"
ExpiresDefault "access 2 days"
&lt;/IfModule&gt;
## EXPIRES CACHING ##


Also you can try 

&lt;FilesMatch "\.(jpg|jpeg|png|gif|swf)$"&gt; Header set Cache-Control "max-age=604800, public" &lt;/FilesMatch&gt;