you don't read images with PHP or cake.
on apache you can use mod_expires.
webroot/htaccess:
<IfModule mod_expires.c>
ExpiresActive On
ExpiresByType image/jpg "access plus 1 day"
ExpiresByType image/jpeg "access plus 1 day"
ExpiresByType image/gif "access plus 1 day"
ExpiresByType image/png "access plus 1 day"
</IfModule>
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