Rasterize text separately from other image

[bestander]

Hi guys,

I have a quick question.

We need to be able to edit the text on a book cover that we render with javascript-fx after it was saved to the server.
We came up with the idea to rasterize all image layers and text layer separately and upload them to the server.
The server would make a merge of two images for book shelf display and return only the image without text for the "cover edit screen".

Is it possible/easy to implement generation of output image with an excluded text layer?