What character codes could these be?

Question

Good day. I have these character codes in a binary file (Adobe After Effects Project) that represent a string. If I change them the text inside the application changes. However, for the life of me, I do not understand what kind of character codes these are. They're not ASCII codes, they're not Hex codes, they're not anything I can recognize. Here's a couple of examples:

 [ 42 42 80 72 85 82 82 81 3 ]

translates to: "GGmeroon".

And

 [ 38 68 80 72 85 68 3 ]

translates to: "Camera".

(Uppercase/lowercase matters).

Can you help me find a way to translate these codes?

Thanks.

Answer 1

As Commented by@gordon it is simply a trivial subtraction algorithm

:\>type ggmer.py
instrs  =   [   list("GGmeroon"),           list("Camera")      ]
outdec =    [   [42,42,80,72,85,82,82,81],  [38,68,80,72,85,68] ]

l1 = len(instrs[0])
l2 = len(instrs[1])

for i in range(0,l1,1):
    print( ord(instrs[0][i])-outdec[0][i],end = " ")

print("\n")

for i in range(0,l2,1):
    print( ord(instrs[1][i])-outdec[1][i],end = " ")

result

:\>python ggmer.py
29 29 29 29 29 29 29 29

29 29 29 29 29 29
:\>