Photoshop Basic Concepts Canvas, Layers, Path and Opacity.

Canvas

• Canvas is a new work place
• Canvas is in square shape and has width and height
• The units of width and height maybe Pixel, Inches, Centemeter, Millimeter,Points, Picas, Columns
• The canvas has a colour mode it may be Bitmap, RGB, CMYK, Lab Color and Greyscale
• The canvas also has a background content. It may be white or background colour we have selected or transparent.

Layers

• Layers are an important concept in photoshop
• Layers are arranged in a canvas
  
• If we selected the canvas content as Transparent, then there is no background (instead there is Layer 0)
  
• If the top layer is fully covered the canvas, then we cannot see rest of the layer’s content under it. We can only see the portions of a background only through the transparent area of those layers above it.
  
  

Path

• Paths are not drawn as pixels, it is not a picture content. We can consider it as a vector content.
• It has multiple functions and can be discuss in our experiments later.

Opacity

• Opacity denotes how much opaque a Layer is
• It is measured in Percentage (in Photoshop)
• If opacity is 0% then the layer is transparent
• If opacity is 100% then the layer is best visible
• Here in the picture shows the White Colour of 3 Layers with different Opacity value