imagem passa o mause ele fica escuro

• Vá em Design;
• Editar HTML;
• Procure por:

 .post-body img.

Substitua por: 

.post img {

filter: alpha(opacity:0.5);

KHTMLOpacity: 0.5;

MozOpacity: 0.5;

-khtml-opacity:.50;

-ms-filter:"alpha(opacity=50)";

-moz-opacity:.50;

filter:alpha(opacity=50);

opacity:.50;

}

.post img:hover {

filter: alpha(opacity:1);

KHTMLOpacity: 1;

MozOpacity: 1;

-khtml-opacity:.1;

-ms-filter:"alpha(opacity=100)";

-moz-opacity:1;

filter:alpha(opacity=100);

opacity:1;

}