It is important to understand the difference between image size and file size. Define each, and discuss why the difference is so important when working with images. Use examples as needed.
What will be an ideal response?
Student answers will vary, but should resemble the following:
Image size refers to the physical dimensions of the image-its width and height. So if you say an image is 8" x 10", you are referring to its image size. File size refers to how big the file is in computer memory-how much storage space it takes up on your computer. If an image is 42 MB (megabytes), that is its file size. Remember that every pixel in an image increases the file size of the image. Therefore, resolution and image size both affect file size. The greater the resolution-the more pixels per inch-the greater the file size. The greater the image size-the more inches of pixels-the greater the file size. If you were printing an 8" x 10" color poster at 300 ppi, your file size would be somewhere close to 27 MB, and the image would be composed of more than 7 million pixels!
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