Anyone can do this with photoshop or similar image editor to make a not so great photo better, and in some cases much better! Open up photoshop and you should have the oh so familiar screen here. If you don't have photoshop there is a very similar program called GIMP you can download for free. Here is a link for downloading GIMP. GIMP
Step 1: Getting Started With an Image
Now open the image you want to make better. I chose to use this photo of Alton Brown from the food network. Why did i choose it? Well i just like Alton Brown!
If you want to use this photo feel free to right click it and save and open it up, if you have another photo to try this simple process out on then load it up and lets get started.
Step 2: Starting Your Image Editing
After that you will have a screen like this.
You will have the levels adjustment box open and ready for tweaking.
Step 3: Ajusting the Levels
As you see I have moved the highlights slider right to where the highlights start there. After you do that you can adjust the blacks ( far left slider) if needed. Here in this photo thats not needed so i don't touch it. After you have done that adjust the mid tones slider ( the middle slider) where its the best looking for you personally. You can't go wrong if it looks good to you because thats what matters. There is no right or wrong on this, its all personal preference. I like mine here so now i click ok in the dialog box to confirm my changes and it saves the image as so.
Step 4: Adjusting Hue and Saturation
Step 5: Your Finished Product
I hope this helped some people with simple adjustments in PS because that was my goal, to give a very entry level Instructable on PS to make images better.