Not implemented due to memory restrictions on the arduino

Hello,
I am working with Gt-521F32,every thing is working fine.I cane able to implement all the functions and i can able to make and run code for Delete also.
But here my question is in Gt-521F32 libraries some functions are not implemented due memory restriction on the arduino.
If i need to use those functions like
1)GetImage
2)GetRawImage
and more functions which are already defined but there is no expansion of above functions in .CPP file library with below message.
"Not implemented due to memory restrictions on the arduino."
How can i use them can any one tell me?

How can i use them

First, you implement them. When you (try to), perhaps you'll realize why the library author(s) didn't implement them for you.

SivaBharani:
If i need to use those functions like
1)GetImage
2)GetRawImage
and more functions which are already defined but there is no expansion of above functions in .CPP file library with below message.
"Not implemented due to memory restrictions on the arduino."
How can i use them can any one tell me?

Its possible the Arduino the library was designed for does not have enough memory to implement the functions.

GetImage returns a picture? How big? How much memory is on the UNO?

Even very small digital images are bigger than an UNO's entire memory.