Image saving by the rich text editor

In Advanced rich text editor, i want to save a image, then how to save the source code of that image which is view in menu bar into a variable? 

I want to save below source code into a variable: 

But, When I pass a variable in richTextSaveInto, it save like below:  (length of characters: 247454)

which is too long to save into DB.

So, I want to save the source code which is view in menu bar 

Please anyone suggest !!

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