Sending images through json getting failed

Sending images through json getting failed

Code:
NSData *imgd=UIImageJPEGRepresentation(Obj.thumbImage, 0.5);
[imgName insertObject:Obj.imageName atIndex:i];
[imgName1 insertObject:imgd atIndex:i];
[dic setObject:imgName forKey:@"name"];
[dic setObject:imgName1 forKey:@"image"];
[asiLoadingFormRequest setPostValue:contactName
forKey:@"receivername"];
[asiLoadingFormRequest setPostValue:[dic JSONRepresentation]
forKey:@"imagedata"];
Is it correct to way sending images through json?When i call server i am
getting following error message
"Error Domain=org.brautaset.JSON.ErrorDomain Code=1 \"Unsupported value
for key image in object\" UserInfo=0x9a611f0 {NSUnderlyingError=0x9a4a290
\"JSON serialisation not supported for NSConcreteMutableData\",
NSLocalizedDescription=Unsupported value for key image in object
Is it problem with Json that does not support for images?I have no idea
about this problem.any help will be appreciated.thanks in advance.