Read e-book online A Simple Guide to Digital Cameras, Scanning and Using Images PDF

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By Oliver Pavie

ISBN-10: 0130938769

ISBN-13: 9780130938763

An easy advisor to electronic cameras, scanning and photographs. even if you must take uncomplicated photos and email them in your neighbors or increase your files with electronic pictures, there's lots of software program and on hand that will help you do it. yet that is the easiest? and the way do you employ it? so that you can create terrific pictures with assistance from a digicam and your notebook then glance no extra than "A easy advisor to electronic cameras, scanning and utilizing images." full of crucial details, counsel and methods, this entire and obviously awarded guide is precisely what you must grasp electronic imaging. turning into knowledgeable hasn't ever been easier!

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Extra resources for A Simple Guide to Digital Cameras, Scanning and Using Images

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2: Images on the computer Compression is the key to efficiency. At its simplest, it involves condensing the information in the file. ’ This is known as ‘lossless’ compression, because you don’t lose any information. If you want to make the file even smaller, you have to throw away some of the information it contains. Suppose you have an area of blue sky. Probably the pixels vary slightly in colour, but no one will notice if you make them all the same colour. This is how the JPEG format compresses images.

You then have to decide how big it should be. 6). ■ ■ If you make the image two inches wide, the resolution is 300 dpi. Each square inch contains 90 000 invisibly small pixels. If you make it three inches wide, the resolution is 200 dpi. Each square inch contains 40 000 pixels that are still pretty small. 6 This image is 600 pixels wide, and 450 tall. 29 30 Digital cameras, scanning and using images ■ ■ ’Image size’ can mean three things: the size of the image file, in kilobytes (usually referred to as the ‘file size’); the size of the image, in pixels (sometimes referred to as the ‘pixel dimensions’ of the image).

14). Compression is essential when you’re preparing images for use online (see Chapter 9). However, it is a compromise. Overdo the compression and you’ll spoil your images. 14 Compare these images with no compression (a), low compression (b), high compression (c) and far too much compression (d). 14dd Choosing a digital camera How do digital cameras work? Pros and cons The best digital camera Camera features Specialist cameras Decisions, decisions 3 48 Digital cameras, scanning and using images Compared to computers, digital cameras are easy to understand.

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A Simple Guide to Digital Cameras, Scanning and Using Images by Oliver Pavie

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