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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} .
Codestream packing: All entropy-coded data are packed into a linear stream of bits (grouped in byte multiples) along with all of the required image metadata. This sequence of bytes is called the codestream and its high-level syntax is based on the typical JPEG markers and marker segments syntax. [29]
In the table below, the column "ISO 8859-1" shows how the file signature appears when interpreted as text in the common ISO 8859-1 encoding, with unprintable characters represented as the control code abbreviation or symbol, or codepage 1252 character where available, or a box otherwise. In some cases the space character is shown as ␠.
Size of the BMP file (54 bytes header + 16 bytes data) 6h 2 00 00 Unused Application specific 8h 2 00 00 Unused Application specific Ah 4 36 00 00 00 54 bytes (14+40) Offset where the pixel array (bitmap data) can be found DIB Header Eh 4 28 00 00 00 40 bytes Number of bytes in the DIB header (from this point) 12h 4 02 00 00 00
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.
Run-length encoding (RLE) 03: 3 1 byte The number of bits constituting one plane. Most often 1, 2, 4 or 8. 04: 4 2 bytes The minimum x co-ordinate of the image position. 06: 6 2 bytes The minimum y co-ordinate of the image position. 08: 8 2 bytes The maximum x co-ordinate of the image position. 0A: 10 2 bytes The maximum y co-ordinate of the ...
The bits representing the bitmap pixels may be packed or unpacked (spaced out to byte or word boundaries), depending on the format or device requirements. Depending on the color depth, a pixel in the picture will occupy at least n/8 bytes, where n is the bit depth.
Image ID length (field 1) 0–255 The number of bytes that the image ID field consists of. The image ID field can contain any information, but it is common for it to contain the date and time the image was created or a serial number. As of version 2.0 of the TGA spec, the date and time the image was created is catered for in the extension area.