Hi Thomas,
You are right, the extra characters are what make up the BMP file header of the picture.
The picture was made with an old program from many years ago when mobile phones were just about able to send a picture.
I think the maximum picture size at the time was 640x480.
My Brother and I used the program to send text and zip files via the mobile sms network and at that time some people didn't use the internet.
I will take a look to see if I can get a hold of Photoshop and give it a go.
All the best, Derrick.
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