GCM 111 Lecture Notes - Lecture 6: Pixel, Digital Image, Adobe Indesign

• School: Ryerson University
• Department: Graphic Communications
• Course: GCM 111
• Professor: Jason Nolan

Document Summary

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. 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 8x8 image at 300ppi has 5,760,000 pixels (8x300x8x300) 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. E. g. a camera can take an image that is 8x10 at 300 ppi, which is. 7,200,000 pixels, which works out to 7 megapixels.