Interpretation of photographic terms

Ae is the abbreviation of automatic exposure control device. ae lock is locked in a certain AE setting, which is used to manually control the exposure during automatic exposure to ensure the normal exposure of the subject. There are several points to pay attention to when using ae lock:

1. ae lock cannot be used in manual mode and self-timer.

2. Do not adjust the aperture size after pressing ae lock.

3. When shooting with a flash, do not use (ae) lock.

2. What is 2.ccd?

Ccd is not only a charge-coupled device, but also a photosensitive system and a circuit device for sensing light, just like the negative of a traditional camera. You can think of it as tiny sensing particles scattered behind the optical lens. When light and images are projected onto the ccd surface through the lens, the CCD will generate current and convert the sensed content into digital data for storage. The more ccd pixels, the larger the size of a single pixel, and the clearer the collected image. Therefore, although the number of ccd is not the only key to determine the image quality, we can still regard it as one of the important standards of camera grade.

3. What is cmos?

Complementary metal-oxide semiconductor (Chinese translation is complementary metal-oxide semiconductor) is also a circuit device for sensing light, which has been widely used in Canon digital cameras since the 20th century.

4. What is dpof?

Dpof refers to digital printing sequence instruction, which is used to record information on storage media (image memory card, etc.). ). In this format, you can set the number of images to be printed.

5. What is 5.exif?

EXIF (exchangeable image file format for digital cameras) is a specification formulated by jeita (Electronic Information Technology Industry Association) to determine the way to record additional information on jpeg images and sounds.

6. What is 6.exif 2.2?

EXIF version 2.2 is a newly revised digital camera file format, which contains all kinds of shooting information needed to achieve the best printing.

7. What is ptp?

Ptp is the abbreviation of "Picture Transfer Protocol" in English.

Ptp is the standard first negotiated by Kodak and Microsoft. Image devices that meet this standard can be better enjoyed by systems and applications after being connected to windows xp system, especially in network transmission. The system can directly access these devices, upload pictures when creating online photo albums, and transmit pictures when chatting online.

Of course, this is mainly for the convenience of ordinary users with little computer knowledge, and it is easier to combine cameras, application software and websites to complete some stupid functions.

8. What is the tiff format?

Tiff is a flexible image format. Its full name is the tag image file format, and the file extension is tif or tiff. The format supports 256 colors, 24-bit true colors, 32-bit colors, 48-bit colors and other color bits, as well as rgb, cmyk, ycbcr and other color modes, and supports multiple platforms. Tiff files can be uncompressed, large or compressed, and support many compression methods such as raw, rle, lzw, jpeg, ccitt3 and 4.

9. What is a wave?

This is the standard windows file format for recording. The file extension is "wav" and the data itself is in pcm or compressed format.

10. Image storage format

Because the image file shot by digital camera is very large, but the storage capacity is limited, the image is usually compressed and then stored. The most common image storage formats are jpeg and tiff files. After jpeg is highly compressed, you can change the file to its original size 1/4, 1/8 or116, which can save a lot of storage space, but also make the original image data lost. Many cameras will provide specific compression ratios for users to choose.

Tiff files are almost uncompressed, so images will be more complete than jpeg. However, the higher the image resolution, the smaller the compression and the more memory space it takes up, so it is necessary to take into account the quality requirements of the image and the capacity of the memory card when taking pictures. For example, an 8mb smartmedia memory card can store 80 photos with 640×480 resolution and high compression format, but if you store photos with 1024×768 uncompressed format, you can only store 3 photos, which is quite different. So be sure to preset the storage mode or simply prepare enough memory cards before shooting.