GCM 111 Lecture Notes - Lecture 2: Digital Image, Pixelation, Digital Single-Lens Reflex Camera
19 Jan 2018
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Document Summary
Size and resolution are dependent upon each other. The resolution of a digital image should be twice the line screen that it is printed at. This ensures that the image will look proper when printed. If the pixels are too close together (too much resolution), you lose detail in the shadows and the file size will be unnecessarily large. Sf= scaling factor: example: a digital image is 4 x 5 and will be printed at a size of 8 x 10 at a line screen of 175. Resolution= 700 ppi: example: an original oil painting needs to be scanned so it can be used as a picture in a book. The painting is 16 x 20 and will be printed at a size of 4" x 5 at 150 ppi. Images that are too big can be scaled down. Images that are too small should not be scaled up.
