Adobe Photoshop Starters

Adobe Photoshop is an image editing, or image creating application, with alot of advanced and useful tools. 

Definitions, understanding terms:

Image - picture, a visual representation of an object or scene or person or abstraction produced on a surface.

Pixel - the information stored for a single grid point in the image. The complete image is a rectangular array of pixels. A pixel consists of a single color.

Diffrence between canvas size and image size.
The image is an object that was drawn and when changing the size of it, it either shrinks or expands, cavans is the space provided to draw the image on, decreasing the size of the canvas doesn't shrink the image but cuts it off, when increasing the cavas size there is more space provided and you can draw out side of the image.

Transparent - if an image is not transparent, the image is automaticaly a rectangular size, if the image is transparent, for instace a circle will always be a circle, the canvas is transparent so the pixels around the circle are non existent.

Anti-aliasing - Smoothing or blending the transition of pixels in an image. Anti-aliasing the edges on a graphic image makes the edges appear smooth, not jagged.

Layer - layers pile on top of each other, think of it as earth's layers of soil, crust and so on. You can change th order of layers, depending if you want an image under an image or the other way around.

Filter - under Filter you will find numerous effects you can apply to a image or selected region of an image.

Bitmap - A representation, consisting of rows and columns of dots, of a graphics image in computer memory. The value of each dot (whether it is filled in or not) is stored in one or more bits of data.

Grayscale - An image representation in which each pixel is represented by a single sample value representing overall luminance (on a scale from black to white).

RGB Color - The red, green, and blue (RGB) color system can represent a large portion of the color spectrum by mixing these three primary colors.

Lab Color - a color model developed by the Centre Internationale d´Eclairage (CIE). These standards are internationally accepted standards for all colormetric measurements. The Lab model, like other CIE color models, defines color values mathematically, in a device independent manner. Lab color is consistent color regardless of the device producing the color.