[Theme: Pink Rio] Need help regarding portfolio images

Hello, I have used filterable portfolio ,added some additional images when clicked on project detail link theme flex slider is created right !. I need here my original images (like image.jpg) which will be displayed in its actual size , but image with some cropped pixel is displayed like this (image-700*45.jpg). I have tried to change value from Pinkrio > theme > functions-theme.php “‘thumb_portfolio_fulldesc’ => array( 700, 345, true )” but nothing changed . main objective is to select original image for description page ( or slider). Please some body suggest ,thanks