JPF
image/jpx
Magic Bytes
Offset: 0
00 00 00 0C 6A 50 20 20 0D 0A 87 0A
JPF files represent the JPEG 2000 Part 2 (JPX) extended file format, a raster image standard developed by the Joint Photographic Experts Group. This format supports advanced features such as alpha channels, layers, and varying color spaces, serving primarily in medical imaging, digital cinema, and professional archival contexts. While standardized as ISO/IEC 15444-2, adoption remains specialized due to computational complexity, with limited native support in consumer web browsers compared to the ubiquitous original JPEG.
Validation Code
How to validate .jpf files in Python
Python
def is_jpf(file_path: str) -> bool:
"""Check if file is a valid JPF 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 .jpf files in Node.js
Node.js
function isJPF(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 IsJPF(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/jpf
curl https://filesignature.org/api/v1/jpf