Photoshop:
Photo editing and manipulation software on the market.
Uses a range from full features editing of large batches of photos to creating intricate digital painting and drawing.

Who invented Photoshop?
Thomas Knoll.
To display gray scale image on a monochrome display.

Gray scale image:
Shades of gray with out color.
Darkest possible shade is black, which is the total absence of transmitted light.
Lightest possible shade is white.

File format:
.PSD = Photoshop document.
.PSB = Photoshop big.

Interface:
Opening and creating work files.

Need of photoshop:
Create graphic design projects.
Restore old photos.
Combine graphic with text.
Change color of a picture.
Correct photography mistakes.
Creates T-shirt designs.
Express creativity.

Disadvantages:
Expensive.
Heavy weight program.
Large space in computer.