《机电技术专业英语 教学课件 ppt 作者 徐起贺 张庆良pata a lesson Twentyfour》由会员分享，可在线阅读，更多相关《机电技术专业英语 教学课件 ppt 作者 徐起贺 张庆良pata a lesson Twentyfour（14页珍藏版）》请在金锄头文库上搜索。
1、,机电技术专业英语,2,Lesson Twenty-four,Text,Advantages of Digital Camera If you want to buy a digital camera, consider the following advantages instant image checking, no scanning, no film cost, and promoting a cleaner environment1. For just a minimal investment, you can enhance you pictures using digital t
2、echnology. All you need is a digital camera, a basic computer, a photoquality printer, maybe some additional memory, and a removable media external drive. Youll also need some imaging programs. Youll be able to crop and get rid of dust marks and scratches, bleach, sharpen, soften, split tone, retouc
3、h color, and perform dozens of other functions including correcting perspective2. And do it so quickly and easily that your result will soon surpass those of conventional photographers who took years to learn their craft.,Digital Camera,Lesson Twenty-four,Basic Requirements of Digital Camera Lets ta
4、lk about basic requirements of digital camera. Any digital camera that has a 640 by 480 pixels resolution would be a good start if you dont need prints larger than 4 by 6 inches3. If you do require bigger prints, you have to up the resolution. For PC (personal computers) users, they will need a 386
5、or later processor, windows3.1, 95, 98 and at least thousands of colors; otherwise you should get an inexpensive video card. Aside from the printer, your monitor is one of the most important elements in the digital chain. So if youre thinking of getting a new one, dont skimp because you are going to
6、 spend many hours facetoface every day. In addition, you may find a CD ROM drive useful for these reasons; first, most programs are stored in CD ROM today. Next, there are some excellent multimedia CDs on a wide range of subjects, including photography that might interest you. Finally, you can play
7、your audio CDs while you worka nice plus.,Lesson Twenty-four,If you have an old, smaller hard drive, you may need some extra storage space for the images you work on. Their file sizes can gobble up anywhere form 1MB5MB (thats prepicture) and theyll fill up your drive fast. Finally, Im going to sugge
8、st you buy a color inkjet printer. Camera Resolution Resolution is the ability of a device to record fine details in an image. Images form digital cameras are made up of little squares (sometimes rectangles) called pixels. A pixel is short for a “picture cell”. A digital cameras imaging surface is m
9、ade up of tiny individual light sensors that capture color and light information, which is then electrically concerted into digital datathe cells or pixels that make up the image. If a camera is capable of capturing an image that consists of 640 horizontal by 480 vertical pixels, it is said to have
10、a resolution of 640 by 480 pixels or 307,200 pixels. The more pixels that can be packed into a given area, the higher the resolution is.,Lesson Twenty-four,The higher the resolution, the larger the file sizeeven though most images are compressed in the camera using JPEG encoding4. Your file sizes wi
11、ll depend on the specific image and the degree of compression. Many cameras allow you to select the degree of compression depending on the ultimate picture quality you require. If a high degree of compression is acceptable, it allows you to store more images in the camera or on its memory card. When
12、 an uncompressed image is opened, it will be roughly five to twenty times larger than its compressed size. If you do any editing on images, you wont want to reserve them as JPEGs, because JPEG is a loss compression method. This means that to reduce file size, some of the image information is lost; o
13、nce gone, you cant get those pixels back without starting over from your original image. So save images in the Tagged Image File Format (TIFF or TIF), a lossless compression form, if available, to save space.,Lesson Twenty-four,New Words and Expressions,Lesson Twenty-four,Lesson Twenty-four,Lesson T
14、wenty-four,Notes,1. If you want to buy a digital camera, consider the following advantages instant image checking, no scanning, no film cost, and promoting a cleaner environment. 买一个数码相机具有如下优点：可以马上看到照片是否满意，无需扫描（就可存入电脑），不需花钱买胶卷，促进环境清洁（不乱丢废胶卷）。 2. Youll be able to crop and get rid of dust marks and sc
15、ratches, bleach, sharpen, soften, split tone, retouch color, and perform dozens of other functions including correcting perspective. 你可以修剪去照片的斑点及划痕，对照片进行擦除、漂白、锐化、软化、分离色调、润色和其他几十种包括校正背景等处理。 marks and scratches 两个复数名词做动词crop 和get rid of的宾语， bleach、sharpen、soften、split、retouch、perform 几个动词与crop和 get ri
16、d of并列作句子的谓语。 3. Any digital camera that has a 640 by 480 pixels resolution would be a good start if you dont need prints larger than 4 by 6 inches.,Lesson Twenty-four,如果你不需要打印大于46英寸的照片，则一个有640480像素的数码相机就很好。 by表示长方形的大小。例如：a room 15 feet by 20 feet一间长20英尺，宽15英尺的房间。1cm (centimeter)=0.3937 inches; 1m (meter)=39.37 inches. 4. The higher the resolution, the larger the file sizeeven though most images are compressed in the camera using JPEG encoding. 分辨率越高，文件也就越大，尽管大多数图片
