image processing - Read makernote EXIF tag in C# -

image processing - Read makernote EXIF tag in C# -

i trying decode makenotes exif tag using c#

below returns makernote tag, have no thought how decode makenotes data

//makernotes 37500 public byte[] getmakernotes() { seek { propertyitem propitem = image.getpropertyitem(37500); byte[] pv0 = propitem.value; homecoming pv0; } grab (exception e) { if (e.gettype().tostring() != "system.argumentnullexception") { } } homecoming new byte[0]; }

with test image, above returns byte array 7632 bytes long.

i not sure if makenotes tag info has sort of sub-tag can used?

these links indicate this:

http://www.sno.phy.queensu.ca/~phil/exiftool/tagnames/canon.html

i looked @ jeita cp-3451 spec see how tags constucted, bytes returned makernotes tag dont seem follow this.

http://www.kodak.com/global/plugins/acrobat/en/service/digcam/exifstandard2.pdf

entire byte array read without sort of byte decoding follows:

byte[] notes = r.getmakernotes(); (int = 0; < notes.length; i++) { this.textbox1.appendtext(notes[i].tostring() + "\n"); }

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0 0 0 22 179 48 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 20 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 36 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 20 0 0 0 4 6 5 0 40 0 0 135 0 0 0 7 48 48 48 0 73 73 42 0 142 3 0 0

it's propriary info blob. it's described here canon 450d.

the first bytes in byte array not, however, seem correspond sane according linked document. either there other info before need strip, or 650d has additional format ids not documented in link above.

c# image-processing