Photoshop is a professional software for web design and image editing. For the first time was released in 1990 as Photoshop 1.0 and since today has evolved continuously being the most used graphic editor by web designers.
Some particularities of this complex program are default PSD (short name for “Photoshop Document”) files that are able to store multiple layers that are composing one image. These layers can be moved and edited separately giving to editor a large control of details and facilitates easier modifications and enhancements.
Photoshop also works with common image types (PNG, JPG, GIF) and supports transparency, masks, alpha channels and many other features. In this program images can be edited pixel by pixel, allows high zoom and corrections for each detail. Can import files from Adobe Illustrator and is used always before finishing a page layout or a logo for final tune and corrections.
It can combine pixel and vector based editing in one single workspace.