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JFIF Format For all practical purposes a "JPEG file" means "a JPEG file in the JFIF format" The JFIF standard defines the following: A signature for identifying JPEG files Colorspace Pixel density for device independent display of an image Thumbnails The relationship of pixels to sampling frequency The general layout of a JFIF file is shown in Figure 51 Because all of the JFIF-specific information is stored within APP0 markers, JFIF files are completely compatible with the JPEG standard JFIF requires that the SOI that starts the file be immediately followed by an APP0 marker in the format shown in Table 59 JFIF specifies that the YCbCr colorspace be used The conversion between RGB and YCbCr specified by JFIF was shown in 1 Color images should have all three components, and their component identifiers should be Y=l, Cb=2, and Cr=3 Grayscale images should have only the Y component A JFIF file can be identified by reading the first 11 bytes and ensuring that the first 4 bytes are FF16 D8 16 FF16 E016 (SOI marker followed by APP0 marker) After skipping 2 bytes the next 5 bytes should be J, F, I, F followed by 0016 A file that starts with this pattern is unlikely to be anything other than a JFIF file The JFIF APP0 header may be followed by another APP0 used to embed a thumbnail in a format other than the RGB triple format defined by the header The format of the data following the length field for the optional APP0 header is shown in Table 510 If the JFIF extension header has an extension_code of 1016 the extension_data field contains a JPEG encoded image Colors are encoded according to the JFIF standard, but the compressed data does not contain a JFIF APP0 header The format for the extension_data when the extension_code is 1116 is shown in Table 511; the format for 1216 is shown in Table 512 Your applications should avoid creating APP0 markers other than those required by the JFIF standard There are fifteen other APPn markers available, and this should be sufficient for any conceivable situation When applications create APPn markers, it should place the application name at the start of the data area This allows the marker's creator to be identified
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Figure 51 Structure of a JFIF File
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Table 59 JFIF APP0 Header Format
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Field Name Identifier Version major ID Version minor ID Units
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Description The zero-terminated string JFIF The major ID of the file version For the current JFIF version (12) this value is 1 The minor ID of the file version For the current JFIF version (12) this value is 2 Units for the X and Y pixel densities Zero means that no densities are used The next two fields specify the aspect ratio One means that the next two fields specify pixels per inch Two means that they specify pixels per cm Horizontal pixel density Vertical pixel density Width of the optional thumbnail image This value may be 0 Height of the optional thumbnail image This value may be 0 An optional thumbnail image The size of this field is 3 Xthumbnail Ythumbnail The image is stored with 3 bytes per pixel with the colors in RGB order
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Xdensity Ydensity Xthumbnail Ythumbnail Thumbnail
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Table 510 JFIF Extension Header Format
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Field Name Identifier extension_code
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Description The zero terminated string JFXX Specifies the format of the extension_data field below 1016 means that the thumbnail is encoded using JPEG 1116 means that the thumbnail is encoded with 1 byte per pixel, 1216 means that the thumbnail is encoded with 3 bytes per pixel
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Table 511 extension_data Format for JFIF Extension Type 1116
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Field Name Xthumbnail Ythumbnail Palette Pixels
Size 1 byte 1 byte 768 bytes Variable (Xthumbnail Ythumbnail)
Description Thumbnail width Thumbnail height Array of 3-byte RGB color values Indices into the palette for each pixel in the thumbnail
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Table 512 extension_data Format for JFIF Extension Type 1216
Field Name Xthumbnail Ythumbnail RGB
Size 1 byte 1 byte Variable (3 Xthumbnail Ythumbnail)