Let's take a look at EXIF:EXIF can be attached to JPEG, Tiff, Riff, and other files to add content about the digital camera shooting information and the version information of the index graph or image processing software. All JPEG files start with the string "0xffd8" and end with the string "0xffd9. The file header contains a series of "0xff ??" Format String, called "identifier", used to mark the information segment of a jpeg file. "0xffd8" indicates that the image information starts, and "0xffd9" indicates that the image information ends. The two identifiers do not have any information, while other identifiers keep up with some information characters. 0xffe0 -- the identifier between 0xffef is called "application tag" and is not used by common JPEG files. EXIF records the shooting information such as the shutter speed and aperture value by using these information strings, it can even include global positioning information. According to the definition of these identifiers according to exif2.1 standards, digital cameras can record various shooting information into digital images, and application software can read the data and then retrieve the specific meanings of these identifiers according to exif2.1 standards, generally, it includes the following information: Image Description, image description, and source, the artist tool used to generate images. Some cameras can enter the user's name. Make indicates the product manufacturer. model indicates the device model. Orientation indicates the camera support, some do not support xresolution/yresolution x/y resolution. This topic already has a special entry to explain this problem. The Resolution Unit is generally ppisoftware. The software displays the firmware version date, and time. ycbcrpositioning is used to locate the EXIF offset EXIF information location and define the write of EXIF information in the file, some software does not show exposure time, that is, shutter speed F number aperture coefficient exposure program refers to the program-based Automatic exposure settings. Different cameras may be shutter priority (shutter priority, TV) aperture Priority (Aperture priority, AV) and so on. ISO speed ratings sensitivity EXIF version datetime original creation time datetime digitized digitization time components configuration Image Construction (Multi-finger color combination solution) Compressed bits per pixel (BPP) the color bit per pixel during compression refers to the degree of compression exposure bias value exposure compensation. Max aperture value maximum aperture metering mode optical measurement method, average optical measurement, central key optical measurement, point optical measurement, etc. The light source specifies whether to use the flash when the flash is set to the white balance. Focal Length focal length. Generally, the physical focal length of the lens is displayed. Some software can define a coefficient to display the focal length of a 35mm-inch camera maker note (User comment) mark, describe, and record flash pix version (supported by some models) Color Space color gamut, color space exifimage width (pixel x dimension) image Width refers to the number of horizontal dimensions exifimage length (pixel y dimension) Image Height refers to the number of vertical dimensions interoperability IFD universal extension item definition pointers are related to TIFF files, for details, see the compression ratio of the file source file. The above is a brief introduction of EXIF. Currently, most Android mobile phones add location information when taking photos, and can obtain these latitude and longitude information and convert it to a geographical location. However, most images on the network do not contain location information. My recent project needs to add location information for some photos without location information, so I encountered the problem of modifying the EXIF information of the photo. I tried to use the BR to view the raw data in the photo (archive information), and saw the XML of EXIF:
However, when I want to modify it, I find that it cannot be edited. However, it can be stored and imported. That is to say, you can overwrite the original information of another photo to another one. However, this is obviously meaningless and I have not tried it. Then I found the software named EXIF pilot lite, which can be easily modified after installation:
Http://download.csdn.net/detail/sunmc1204953974/8095133 attached below:
Hope to help you.
Modify image EXIF information
