JPG2
application/octet-stream
Magic Bytes
Offset: 0
00 00 00 0C 6A 50 20 20 0D 0A 87 0A
JPG2 is a raster image file format based on the JPEG 2000 standard, developed by the Joint Photographic Experts Group to implement discrete wavelet transform compression. It is primarily utilized in medical imaging, digital cinema, and archival systems that demand high-fidelity, scalable image resolution. While it offers superior compression efficiency compared to standard JPEGs, the format sees limited web browser support and is predominantly found in specialized professional workflows rather than consumer applications.
Validation Code
How to validate .jpg2 files in Python
Python
def is_jpg2(file_path: str) -> bool:
"""Check if file is a valid JPG2 by magic bytes."""
signature = bytes([0x00, 0x00, 0x00, 0x0C, 0x6A, 0x50, 0x20, 0x20, 0x0D, 0x0A, 0x87, 0x0A])
with open(file_path, "rb") as f:
return f.read(12) == signatureHow to validate .jpg2 files in Node.js
Node.js
function isJPG2(buffer: Buffer): boolean {
const signature = Buffer.from([0x00, 0x00, 0x00, 0x0C, 0x6A, 0x50, 0x20, 0x20, 0x0D, 0x0A, 0x87, 0x0A]);
return buffer.subarray(0, 12).equals(signature);
}
Go
func IsJPG2(data []byte) bool {
signature := []byte{0x00, 0x00, 0x00, 0x0C, 0x6A, 0x50, 0x20, 0x20, 0x0D, 0x0A, 0x87, 0x0A}
if len(data) < 12 {
return false
}
return bytes.Equal(data[:12], signature)
}API Endpoint
GET
/api/v1/jpg2
curl https://filesignature.org/api/v1/jpg2