A thousand pixels
An image editing software is a piece of computer program designed to work on an image and make alterations on it. It could as simple as adding a caption within the image, or changing and redesigning the entire image background. Everything is possible. Everything goes.
Computer graphics fall into one of two categories: vector graphics and raster graphics. So there are two different types of image editing software as well to deal with the two kinds of graphics.
Raster graphics editor
A raster graphics editor is a type of image editing program designed to work with photos and images in raster format. You can use the software to pain and edit pictures on the computer, after which you save the image in one of the many common types of raster file formats—bitmap, PNG, JPEG, TIFF and GIF. Raster editors are suited towards retouching, collage, photo processing, and hand drawing illustrations with a pen table.
Some common features of raster graphics editors:
Draw lines and shapes with different types of brushes and colors
Convert and edit various color models
Apply special effects (blurring, sharpening, etc)
Remove image imperfections
Auto fill a specific region
Add different fonts into the image
Composite editing
Vector graphics editor
A vector graphics editor is similar image editing program, but this one works with images saved in vector graphics format. Artists use a vector graphics editor to draw and edit vector images, and then save them in one of many different vector file formats, including VML, SVG, WMF, PDF and EPS. Compared to raster editors, vector graphics editors fare better in graphics design, typography, page layout, logos and illustrations.
Some common features of vector graphics editors:
Some vector graphics editors support animation
Some vector graphics editors support 3D computer graphics
Useful for Computer Assisted Drafting (CAD)
Imagery
It doesn't take a genius to figure out that the Internet is filled with user-customized images.
Someone in a dark cellar room somewhere creates an image and posts it in her blog. Some hours later a teenage boy with a lot of time in his hands sees the image, edits it, and posts it in a gaming forum. Five hundred forum members sees the image, customizes it again, five hundred different versions of it, and what they all have in common is that everyone used an image editing software to “photoshop” the original image. That's the power of image editing.
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