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The bytes s1 and s2 are taken together to represent a big-endian 16-bit integer specifying the length of the following "data bytes" plus the 2 bytes used to represent the length. In other words, s1 and s2 specify the number of the following data bytes as 256 ⋅ s 1 + s 2 − 2 {\displaystyle 256\cdot s1+s2-2} .
Hex signature ISO 8859-1 Offset Extension Description 23 21 #! 0 Script or data to be passed to the program following the shebang (#!) [1]: 02 00 5a 57 52 54 00 00 00 00 00 00 00 00 00 00
For each directory in the image, the path table provides the directory identifier, the location of the extent in which the directory is recorded, the length of any extended attributes associated with the directory, and the index of its parent directory path table entry. The parent directory number is a 16-bit number, limiting its range from 1 ...
The XResolution and YResolution tags provide the number of pixels per length unit for the width and height of the image, respectively. (The length unit itself is specified by the tag ResolutionUnit.) By default, these tags in combination are set to 72 pixels per inch (ppi). [19] These tags were inherited from the TIFF 6.0 standard and are ...
For image type 0, this field would be 0, meaning no extension header fields are used. [1] Extension header byte varible Extension header. See below. Width uintvar: variable Width of the image in pixels. Height uintvar: variable Height of the image in pixels. Data byte array variable Dependent on the type of the image. For image type 0, data ...
Contains the size of this header, normally 64 Bytes for 64-bit and 52 Bytes for 32-bit format. 0x2A: 0x36: 2: e_phentsize: Contains the size of a program header table entry. As explained below, this will typically be 0x20 (32 bit) or 0x38 (64 bit). 0x2C: 0x38: 2: e_phnum: Contains the number of entries in the program header table. 0x2E: 0x3A: 2 ...
The JPEG filename extension is JPG or JPEG. Nearly every digital camera can save images in the JPEG format, which supports eight-bit grayscale images and 24-bit color images (eight bits each for red, green, and blue). JPEG applies lossy compression to images, which can result in a significant reduction of the file size.
VFAT, a variant of FAT with an extended directory format, was introduced in Windows 95 and Windows NT 3.5. It allowed mixed-case Unicode long filenames (LFNs) in addition to classic 8.3 names by using multiple 32-byte directory entry records for long filenames (in such a way that old 8.3 system software will only recognize one as the valid directory entry).