ive been browsing flickr a lot getting ready for my africa trip and notice that some pictures are very dull while others have super vibrant colors. how do you get the colors to pop out? is it the filter? PS editing? lens? for example the colors on this pic suck: http://www.flickr.com/photos/johngrudnowski/522716740/ while the colors on this pic are amazing: http://www.flickr.com/photos/darwishh/754888124/in/set-72157600038093826/ i can provide more pics for reference but im sure you get the idea. what setting should i be shooting the shots to get better colors?