mapping image using pixel values

I have finger image; after cropping and masking I have now masked image. And there is the black area which shows no information; my task is to remapp the image into new pixel values image which have only information.

How can I do using matlab?

[Walter Roberson]

Want should happen to the black area around the finger ?

It is not possible to create a data array that has "holes" in it .

It is possible to create rectangular data arrays that draw in such a way that anything "underneath" shows through. In the case of a simple image displayed with nothing behind it, this would be equivalent to filling in those black pixels with the background color of the axes .

[Imran Riaz]

I share my image here. Task is to create new image which have only pixel information not the black area.

[Walter Roberson]

What should be displayed in the area that is currently black ?

[Image Analyst]

You have pixels with information in them. The black pixels can be ignored. There is no need to crop them off or replace them with anything. It's just not necessary for whatever you want to do next. Besides, it's not possible to have a matrix with "ragged" edges - it must remain rectangular.