Menu
I have a few different JPEG images I've been testing with. As far as I've seen the 0th and first bytes are always 0xFF and 0xD8.
The second and third are usually either 0xFF and 0xE0 ( APP0 ) indicating either a JFIF segment or JFIF extension segment or 0xFF and 0xE1 ( APP1 ) indicating an EXIF segment.
My question: is this always the case? Are the 2nd and 3rd bytes always APP0 or APP1?
966
No. There are e.g. several cameras that create JPEGs without these markers, or with other APP markers. The only thing you can rely on is the SOI sequence, FF D8, not even EOI is produced by all cameras. Also be aware that JPEGs with embedded JPEGs exist - you can have nested SOI/EOI within an image.
If you need to deal with embedded JPEG data in raw camera images, several models produce JPEG-like data that can only be parsed by being a bit slack with the jpeg spec - especially in relation to escaped FF bytes in data. And then you have cameras that produce proprietary data that at first glance looks like jpeg data (e.g. some of Sony's "encrypted" raw formats)
85
Things are complicated here. Since I am currently writing a javascript file identifier, I'll try to answer with my javascript object for JPEG. Especially because the question had a "javascript" tag.
The basic answer is already given (the accepted one) but this is more detailed about how to check the different App markers (with fallback).
There are special APP0s so far for JFIF, EXIF, Adobe, Canon and Samsung (but we don't know about the future). So the logic for the js object is:
If one of the SPECS[x].regex is matched it wins (first one wins). But if nothing is matched, the parent object (only FFd8) wins.
The SPECS object delivers according PRONOM identifiers - you can view them like so
'http://apps.nationalarchives.gov.uk/pronom/fmt/'.concat(PUID) [official] 'http://apps.nationalarchives.gov.uk/pronom/x-fmt/'.concat(xPUID) [experimental]
_FFD8: {
SPECS: [
{
PUID: 112,
regex: /^FFD8FFE8(.{2})53504946460001/,
desc: 'jpeg: Still Picture Interchange Format file (SPIF)',
regexCapture: [
{ key: 'recordedSignature' },
{ key: 'segmentLength', fn: function(h){ return { value:parseInt(h, 16), _val:h.toString() }; } }
],
valueCapture: {
version: '1.00'
}
},
{
PUID: 44,
regex: /^FFD8FFE0(.{2})4A464946000102/,
desc: 'jpeg: JPEG File Interchange Format file (JFIF), v. 1.02',
regexCapture: [
{ key: 'recordedSignature' },
{ key: 'segmentLength', fn: function(h){ return { value:parseInt(h, 16), _val:h.toString() }; } }
],
valueCapture: {
version: '1.02',
}
},
{
PUID: 43,
regex: /^FFD8FFE0(.{2})4A464946000101/,
desc: 'jpeg: JPEG File Interchange Format file (JFIF), v. 1.01',
regexCapture: [
{ key: 'recordedSignature' },
{ key: 'segmentLength', fn: function(h){ return { value:parseInt(h, 16), _val:h.toString() }; } }
],
valueCapture: {
version: '1.01',
}
},
{
PUID: 42,
regex: /^FFD8FFE0(.{2})4A464946000100/,
desc: 'jpeg: JPEG File Interchange Format file (JFIF), v. 1.00',
regexCapture: [
{ key: 'recordedSignature' },
{ key: 'segmentLength', fn: function(h){ return { value:parseInt(h, 16), _val:h.toString() }; } }
],
valueCapture: {
version: '1.00',
}
},
{
PUID: 41,
xPUID: 398,
regex: /^FFD8FFE1(.{2})45786966000049492A00(.+)009007000400000030323030/,
desc: 'jpeg: JPG Image File, using Exchangeable Image File Format (Exif), little endian, v. 2.0',
regexCapture: [
{ key: 'recordedSignature' },
{ key: 'segmentLength', fn: function(h){ return { value:parseInt(h, 16), _val:h.toString() }; } }
],
valueCapture: {
endian: 'little',
version: '2.0',
}
},
{
PUID: 41,
xPUID: 398,
regex: /^FFD8FFE1(.{2})4578696600004D4D002A(.+)900000070000000430323030/,
desc: 'jpeg: JPG Image File, using Exchangeable Image File Format (Exif), big endian, v. 2.0',
regexCapture: [
{ key: 'recordedSignature' },
{ key: 'segmentLength', fn: function(h){ return { value:parseInt(h, 16), _val:h.toString() }; } }
],
valueCapture: {
endian: 'big',
version: '2.0',
}
},
{
PUID: 41,
xPUID: 390,
regex: /^FFD8FFE1(.{2})45786966000049492A00(.+)009007000400000030323130/,
desc: 'jpeg: JPG Image File, using Exchangeable Image File Format (Exif), little endian, v. 2.1',
regexCapture: [
{ key: 'recordedSignature' },
{ key: 'segmentLength', fn: function(h){ return { value:parseInt(h, 16), _val:h.toString() }; } }
],
valueCapture: {
endian: 'little',
version: '2.1',
}
},
{
PUID: 41,
xPUID: 390,
regex: /^FFD8FFE1(.{2})4578696600004D4D002A(.+)900000070000000430323130/,
desc: 'jpeg: JPG Image File, using Exchangeable Image File Format (Exif), big endian, v. 2.1',
regexCapture: [
{ key: 'recordedSignature' },
{ key: 'segmentLength', fn: function(h){ return { value:parseInt(h, 16), _val:h.toString() }; } }
],
valueCapture: {
endian: 'big',
version: '2.1',
}
},
{
PUID: 41,
xPUID: 391,
regex: /^FFD8FFE1(.{2})45786966000049492A00(.+)009007000400000030323230/,
desc: 'jpeg: JPG Image File, using Exchangeable Image File Format (Exif), little endian, v. 2.2',
regexCapture: [
{ key: 'recordedSignature' },
{ key: 'segmentLength', fn: function(h){ return { value:parseInt(h, 16), _val:h.toString() }; } }
],
valueCapture: {
endian: 'little',
version: '2.2',
}
},
{
PUID: 41,
xPUID: 391,
regex: /^FFD8FFE1(.{2})4578696600004D4D002A(.+)900000070000000430323230/,
desc: 'jpeg: JPG Image File, using Exchangeable Image File Format (Exif), big endian, v. 2.2',
regexCapture: [
{ key: 'recordedSignature' },
{ key: 'segmentLength', fn: function(h){ return { value:parseInt(h, 16), _val:h.toString() }; } }
],
valueCapture: {
endian: 'big',
version: '2.2',
}
},
// specific JPEG (all begin with FFD8FF, map them to PUID 41)
{
PUID: 41,
regex: /^FFD8FFED/,
desc: 'jpeg: JPG Image File, Adobe JPEG, Photoshop CMYK buffer'
},
{
PUID: 41,
regex: /^FFD8FFE2/,
desc: 'jpeg: JPG Image File, Canon JPEG, Canon EOS-1D'
},
{
PUID: 41,
regex: /^FFD8FFE3/,
desc: 'jpeg: JPG Image File, Samsung JPEG, e.g. Samsung D500'
},
{
PUID: 41,
regex: /^FFD8FFDB/,
desc: 'jpeg: JPG Image File, Samsung JPEG, e.g. Samsung D807'
}
],
ext: ['JPG', 'JPE', 'JPEG', 'SPF', 'SPIFF'],
signature: [ 255, 216 ],
desc: 'jpeg: JPEG File Interchange Format file, App0 marker not known',
mime: 'image/jpeg',
specifications: [
{ text:'Specification for the JFIF file format', href:'http://www.w3.org/Graphics/JPEG/jfif3.pdf', type:'W3', format:'pdf' },
{ text:'The JPEG compression specification', href:'http://www.w3.org/Graphics/JPEG/itu-t81.pdf', type:'W3', format:'pdf' },
{ text:'Exchangeable image file format for digital still cameras', href:'http://home.jeita.or.jp/tsc/std-pdf/CP3451C.pdf', type:'vendor', format:'pdf' }
],
references: [
{ text:'JPEG JFIF W3 Info', href:'http://www.w3.org/Graphics/JPEG/', type:'W3', format:'html' },
{ text:'JPEG.org', href:'http://www.jpeg.org/', type:'info', format:'html' },
{ text:'JPEG Exif App markers', href:'http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/JPEG.html', type:'info', format:'html'}
]
}
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
