Attached Link: http://thepluginsite.com

I've tried the above products (and methods) mentioned above but found Genuine Fractals PrintPro the best at what it does (been using it for several years now). What it does is increase (or decrease)the resolution (number of pixels)with the least amount of quality loss. Note:There is always going to be some quality loss when you increase or decrease the resolution size with any method. However I'm not sure if this is what you are looking for as you said "enhancement". You may be thinking of increasing the apparent sharpness of your photo. If this is the case,try using the "un-sharp mask" found in Photoshops filters. This usually is good enough for most needs. However if you need the ultimate control in what,how much,and what method is used to sharpen (plus getting rid of the unwanted artifacts caused by sharping),the plugin called "FocalBlade" is what you want (link). SWAMP