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2.01 Investigate graphic image design. Image Resolution
Types of Images • Clip Art – premade graphics that are available online and in many software packages; may be vector or raster. • Photographs – raster images that contain millions of colors. • Art Work – computer created drawings or paintings; may be raster or vector. Which type of image is appropriate? • Select images that reflect the purpose and theme of the document. • Use images to convey meaning and communicate, not to decorate.
The quality of an image is dependent upon two factors: • Resolution • Aspect Ratio Aspect Ratio Resolution
Image Resolution • Resolution is the amount of detail (or data) stored for an image. • The higher the resolution, the higher the level of detail in the image. • Resolution is measured in PPI, or pixels per inch (the number of pixels contained in one inch). • The higher the PPI, the more data that is stored and the better the quality. • The higher the PPI, the larger the file size. • Image editing software can be used to change the resolution of an image.
Image Output Methods • Images can be viewed in two ways • On a screen or monitor • By printing it on paper • Monitors • The display resolution on monitors is also measured in PPI. • Monitors are low resolution devices, most display 72 PPI. • Printers • Printers create output by placing ink or toner on paper. • The resolution at which printers can print is measured in Dots Per Inch (DPI). • Printers are high resolution devices in order to print images clearly without pixelation or blurriness.
Match The Image Quality To The Delivery Method. • Images that will be displayed on a monitor do not need a high resolution. • Using a low resolution means smaller file sizes. • Images with small file sizes load quicker. • Images that will be printed need a higher resolution. • Images with 150 PPI are sufficient for printing on most personal desktop printers. • Images with 300 PPI are better for printing on more sophisticated printers and will produce higher-quality photographs.
Aspect Ratio • Aspect Ratio – relationship of an object’s width to its height Aspect Ratio Resolution
What’s the answer? • An image that is 1”x 1” has a resolution of 100 PPI • What is the effect on the resolution of enlarging the image to 2”x 2”? • What happens to the image quality? • How will this image look when printed?
Resizing a Raster Image • A small image that is enlarged is easily distorted. • Pixels are not added, just enlarged • It is better to start with a large image and make it smaller • File size will remain the same • An image must be edited to reduce file size.