Vector images, are images 'drawn' by math. Every color has a mathematical color assigned to it and a mathematical position as well. Because Vectors are math based you have more freedom of movement. By using many of the tools you can tweak a part of the image and it will adjust the rest of the image according to the change in the mathematical data.
Raster Images are drawn with Pixels and nothing else. To change anything in a Raster image you have to do it yourself rather then letting the computer adjust the image based on your tweaks.
It is possible to convert a Raster image into a Vector image but it won't be one hundred percent right, but it will be extremely close. The image on the left was just a normal Raster image and the one on the right was a Vector image.
How I converted it to a Vector, I opened the image on the left in Illustrator. Then used the Image trace option. This identifies the colors and makes a recreation of the image as a mathematical image. I traced the image as a 6 color image which traced the image and brought the number of colors from 16.7 million to 6, but you can make a traced image in the full colors. I then changed the hue of the image to be more blue then brown.
By selecting the Expand option next to the Trace Image option it shows the mathematical anchors for each section of color. And now that it is a Vector image you can adjust the anchors of the image and change it.
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