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Lecture 3

Introduction to Electronic Premedia I - Week 3 Notes.docx

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Department
Graphic Communications
Course
GRA 323
Professor
Jason Lisi
Semester
Winter

Description
Week 3 Sizing and Cropping When photos are digitized, they become bitmap images. Bitmap images are made up of pixels, and they have resolution restrictions. Sizing and cropping takes into account the finite nature of bitmaps to ensure they meet the resolution requirements for print. Sizing of an original is expressed as a percentage change. Ex: 200% of original size When sizing an original, both dimensions must be scaled at the same percentage, or else the image will become distorted. Anamorphic Distortion: when one dimension is scaled differently than the other Anamorphic Distortion is generally done only to purposely distort the image as a special effect, or in minute amounts in order to fit an exact box dimension. When expressing the dimensions of a photo, the width is always expressed first. Ex: a 10 X 8 photo would be 10” wide by 8” high. Landscape orientation: an image that is wider than it is tall Portrait orientation: an image that is taller than it is wide    Unless the final output size and shape of a digital image is identical to the original photograph, some degree of sizing and/or cropping will have to be done to meet the output requirements. When scanning, it is critical to know this information before starting the scan process to ensure the final image has appropriate resolution. The formula to determine the scaling requirements for an image is: Rp = Reproduction % R = Reproduction Size O = Original Size Sizing Example: An original 5 X 7 reflective photo is to be reproduced at two R = R x100 different sizes: p  2.5 X 3.5 O  10 X 14 What is the necessary reproduction percentage for each? Rp = 2.5 ÷ 5 x 100 = 50% Rp = 3.5 ÷ 7 x 100 = 50% Since both dimensions scale proportionately, phe R is 50% with no cropping. Rp = 10 ÷ 5 x 100 = 200% Rp = 14 ÷ 7 x 100 = 200% Since both dimensions scale proportionately, phe R is 200% with no cropping. When the reproduction dimensions are not proportional to the original dimensions, cropping must be done to prevent anamorphic distortion. Cropping: reproducing a selected area of an original, choosing the “head and shoulders” of a person from a photo that i
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