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 Online Photo Courses |
P.2/2  |
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1. Low & High Res. Images |
2. From 768x512 Image |
3. From 1536x1024 Image |
4. Part of 2 & 3 |
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There are many articles about Digital Camera, to get such kind of information is not difficult. Unfortunately, there are too much figures, and quite a number of expect guides to choose, it still cannot guarantee a successful choice. The major problem is the lack of prominent progress of Digital Camera design, except by lowering production cost that brings down the marketing price to a general standard. No matter it is CCD (Charge-Coupled Device) or CMOS (Complimentary Metal Oxide Semi-Conductor), the basic structure for sensitivity is the same. The major differences are electric consumption, noise etc. Please refer to http://www.suni.com/pages/laserf.htm About the basic knowledge of digital image, including pixel, file formats, please refer to our "Digital Basic", which we shall not repeat here. The number of pixels has been a matter of commercial competition, one camera has one million eight hundred thousands, another will come with one million nine hundred ninety thousands, where all are gimmicks with no substantial benefit. For digital image, it must be by at least 50% or up to make a pronouncing difference. So it must be based on personal demand to choose instead of disturbing by this kind of tricks. The choice must be based on individual output requirement and the actual number of pixel, selecting the one that match closely. For example, if the images will be used for Web pages, with the size as those in our site, it is 330X220. If the images will be used to print up to A4 size photo, the resolution is about 3000X2000 to have a so-called photo quality. We must be clear that this requirement will never change, no matter how good the printers will be, they would not create pixels for us. Most digital cameras are below six million pixels, that is 3000X2000, and are suitable for viewing in web pages, computer display etc. Of course, they are suitable for taking illustration in articles and books. Moreover, digital camera saves the cost of film and processing, and we can be sure whether an image is good or not immediately. |
It is not easy to demonstrate in web page for the comparison of different resolution images because it is limited by the size of image and display. Image No.1 is the screen display of two image files, with 768x512 and 1536x1024. Image No.2 is the 768x512 and Image No.3 is the 1536x1024. Image No.4 shows a part of No.2 (left) and No.3 (right). In a glance, one may think that the lower resolution is better. The major difference is the color detail, the higher resolution image has subtle details when the lower resolution image is lack of. We can find from Image 4 that the higher resolution has a much better look. Also, this proves that 'matching' is the most important element in Digital Imaging. All images have been downsized for this page and therefore the difference is not so much as it should be. That is why the final output matters most in Digital Imaging. |
Front Page |
The Selection of Digital Camera P.1/2 |
P.2/2 |