JPGM
image/jpm
Magic Bytes
Offset: 0
00 00 00 0C 6A 50 20 20 0D 0A 87 0A
The JPEG 2000 Multi-layer (JPGM) format is a compound image standard defined in ISO/IEC 15444-6 by the Joint Photographic Experts Group. It is primarily used in document imaging systems to efficiently store scanned pages containing both sharp text and continuous-tone imagery using Mixed Raster Content architecture. While less ubiquitous than PDF for general document exchange, it remains a standard solution for specialized archival systems and poses minimal security risks during viewing.
Validation Code
How to validate .jpgm files in Python
Python
def is_jpgm(file_path: str) -> bool:
"""Check if file is a valid JPGM 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 .jpgm files in Node.js
Node.js
function isJPGM(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 IsJPGM(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/jpgm
curl https://filesignature.org/api/v1/jpgm