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Lecture 3

GCM 111 Lecture 3: Week 3 Pt 2

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Ryerson University
Graphic Communications
GCM 111
Jason Lisi

WK 3: Applications, File Formats and Resolution 02/02/2018 Lesson Objectives: To learn the different type of applications and file formats used in graphic communications To understand which file formats are used for which purpose/application To explore the differences between vector graphics and bitmap images To understand the difference between input and output resolutions To learn the different terminologies used to describe resolution Resolution Relationships: When determining the quality of output, we often hear about different resolutions: The image was captured at 450 ppi The final resolution should be 300 ppi The plates are output at 2400 dpi The line screen is 150 lpi Resolution terminology can be quite confusing: Pixels per inch (ppi) Dots per inch (dpi) input/image/scan resolution output/print resolution Device resolution Line screen/screen ruling Pixels per Inch (ppi): Number of pixels per inch in a digital image Ppi and dpi are often used interchangeably but strictly speaking this is not accurate The total number of pixels in an image can be calculated by multiplying the height and width of an image by the ppi E.g. an 8 x 8 image at 300 ppi has 5 760 000 pixels (8 x 300 x 8 x 300) Ppi can also be used to calculate megapixels for a digital camera Use ppi and image size to calculate the total number of pixels in an image, divide by 1 million and average the number
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