Apart from these cosmetic enhancement there are some functional changes as well like the cropping has become more easy. It has got a Mercury Graphics Engine that will enable you t perform very fast. Adobe Photoshop Portable CS4 has a totally revamped interface and it has got more darker than before. The CS4 version has brought more magic into image editing. Adobe Photoshop Portable CS4 is an application that can be used on multiple systems as it is installed on USB drive. Adobe Photoshop is probably the best known photo editing application till date.