The buttons on the side are fairly self-explanatory, but I will briefly go over them. The scissors button is for cropping - simply drag the size of the box you would like and hit crop. The two arrows in the form of a box is for rotating the image. The filter button is the one that looks like an oil filter. This is for more drastic effects such as sharpen, pencil, blur, black & white, posterize, sepia, nightvision and heatmap. You can adjust the strength of each of these filters or reset to the original photo. The color wheel button allows you a great deal of control when it comes to color adjusting. You can change the levels (auto levels works wonderfully), the exposure, the colors and the red-green-blue balance of the photo.
The next two buttons are something that you will most likely not use for journalistic function - the star button allows you to add shapes such as a speech bubble and the square allows you to add a border or frame.
If you make a mistake, click on the back or redo arrows, which are the next buttons down. The final button is used to save your edits. You can change the resolution of the photo (200, 320, 640, 800, 1024, 1600, 2048 and 2592 for high resolution images). You can also preserve geotags, and share your image in a variety of ways such as email, FTP, flickr and Facebook.
Photogene is only $1.99 and I would highly recommend it!
If you don't take my word, take the word of Glyn Evans, the founder of iPhonegraphy. His website, http://www.iphoneography.com/ features all photos shot on mobile devices. This is his opinion of Photogene:
Photogene is like having a desktop photo editor in your pocket, giving you the ability to truly edit your photos on the go, letting you crop, sharpen, straighten, rotate and add frames to your photos, as well as manually or automatically adjust histogram levels, gamma correction, RGB balance, the colour temperature and saturation.