• It was originally created in 1988 by Thomas and John Knoll
• Adobe Photoshop is a raster graphics editor
• In 1990 Photoshop 1.0  release by Adobe Inc.
• Photoshop files have default file extension as .PSD and .PSB, which stands for “Photoshop Document”.
• A PSD file has a maximum height and width of 30,000 pixels, and a length limit of two gigabytes and PSB file has a maximum height and width of 300,000 (3 lakh) pixels, and a length limit of four extra bytes

COLOR MODE:

1. RGB mode (millions of colors)  = 256*256*256= 1,67,77,216   (Red, Green, Blue)
2. CMYK mode (four-printed colors) = Cyan Magenta Yellow Black
3. Index mode (256 colors)
4. Grayscale mode (256 grays)
5. Bitmap mode (2 colores)