Apple refreshed its iPod lineup yesterday and the iPod touch – the company’s best-selling iPod – has received the most thorough makeover, adding camcorder and video calling capabilities to its long list of features. Although Steve Jobs boasted front and back cameras for FaceTime calling and HD video recording, respectively, he said nothing about still images falling behind the iPhone 4.
Image resolution describes the detail an image holds. The term applies to digital images, film images, and other types of images. Higher resolution means more image detail.
Image resolution can be measured in various ways. Basically, resolution quantifies how close lines can be to each other and still be visibly resolved. Resolution units can be tied to physical sizes (e.g. lines per mm, lines per inch), to the overall size of a picture (lines per picture height, also known simply as lines, or TV lines), or to angular subtenant. Line pairs are often used instead of lines; a line pair comprises a dark line and an adjacent light line. A Line (or TV line, TVL) is either a dark line or a light line. A resolution of 10 lines per millimeter means 5 dark lines alternating with 5 light lines, or 5 line pairs per millimeter (5 LP/mm). Photographic lens and film resolution are most often quoted in line pairs per millimeter.
Latest iPod touch can only takes 960×720 resolution images, which is a substantial downgrade compared to the iPhone 4’s back camera rated at five megapixels. This could be due to either cost reasons or space constraints. The new iPod Touch is slimmer than the previous model. At 7.2 millimeters, the device is 2.1 millimeters thinner than the iPhone 4, which measures 9.3 millimeters in depth. The iPhone 4’s back camera could be too large and too thick to fit inside such a thin enclosure.
On the other hand, consider that the new iPod touch ups its price to $229. The previous entry-level 8GB iPod touch sold for $199. Jobs pitched the figure a year ago as "a sweet price point" meant to popularize the device among the youngsters by positioning it as an affordable alternative to Sony’s PSP and Nintendo’s DS consoles.
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