Photoshop

Digital Graphics

Overview

Before you learn to manipulate a digital image in Photoshop, it's important to know what exactly how monitors display images and what images are made up of. Colour space, resolution, colour depth, and file types are all fundamental aspects of a digital graphic.

Here is a summary of the topics in this module:

(1) Computer Monitors: Learn how pixels are displayed on computer monitors and how that affects the display of images.

(2) Bitmap Graphics: There are two graphic formats that can be used on the Web: bitmap and vector. Both are described and illustrated in this lecture.

(3) Image Resolution: The resolution of a bitmap image is an important consideration, regardless of whether it is destined for the Web or for print. This lecture defines resolution and explains how it affects the display of bitmaps.

(4) Dimensions: A bitmap's dimensions directly affect the file size of the image.

(5) Colour Space: Learn what a colour space is and the role it plays in understanding digital graphics. The RGB colour space is defined.

(6) Bit Depth and Colour Depth: This lecture discusses colour depth and its dependency on bit depth.

(7) GIF Format: GIF is a lossless bitmap image format commonly used on the Web. It has various options such as transparency, dithering, and animation.

(8) JPEG Format: The JPEG format is also widely used on the Web. It permits the display of a full range of colours and you can control the amount of compression applied.

(9) PNG Format: The PNG format is a newcomer to the WWW. It combines some of the features of GIF and JPEG.

(A) Vector Graphics: Vector graphics are based on mathematical descriptions and their properties can be edited with no loss in image quality.

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