In the files I'm looking at, the SOI marker (ffd8) is at offset 0. But
assuming you have some where it is not, why not just open the file, and
look for the marker?:
head = open(jpg_filename, "rb").read(4000)
soi_offset = head.find('\xff\xd8')
You're going to have to open and read the fi
I think I made a conceptual mistake: I should look for SOS (ffda,
start of stream), not SOI (start of image).
Unfortunately, figuring out this marker is not so easy, because many
JPEG files from digital still cameras have a thumbnail embedded in one
of their header segments. As this thumbnail imag
Hi,
I want to implement some sort of "post header checksum" for JPEG
images, i.e. the checksum should only change if the actual image data
was altered, EXIF/IPTC metadata modifications should have no effect.
My plan to do this is to scan for the JPEG SOI marker, read n bytes
after this marker and
Hi,
I want to implement some sort of "post header checksum" for JPEG images,
i.e. the checksum should only change if the actual image data was altered,
EXIF/IPTC metadata modifications should have no effect. My plan to do this
is to scan for the JPEG SOI marker, read n bytes after this marker and
