PhotoshopA perfect tool for graphic designers
Adobe Photoshop is a raster graphics editor developed and published by Adobe Systems for Windows and OS X. It can edit and compose raster images in multiple layers and supports masks, alpha compositing and several color models including RGB, CMYK, Lab color space (with capital L), spot color and duotone. Photoshop has vast support for graphic file formats but also uses its own PSD and PSB file formats which support all the aforementioned features.
To create a perfect transparent background is very basic but an important thing for any graphic designer to learn.