Photoshop CS3 is a photo manipulation and matte painting software created and distributed by Adobe systems.
This is little bit costly. But everything is available to produce a photo as your wish. There is lots of tools available to edit with your photos.
You can scale and transform images. You can edit the colors of image with curves, auto color, brightness, contrast and much more.
There is yet lots of stuff to do with photoshop cs3. you can blend more than one images with one image. you can create business cards, invitation cards, movie posters, background stuff for chroma key, known as green screening, and lot more.
if you are a beginner, you can find lots of tutorial on youtube and also we have a channel called Dragons Studio. you can find photoshop tutorial in our channel. you can comment me to know about photoshop.