Copy A non-Rectangular Image

[ChrisW67]

I still don't know what you expected to see.
For this input and selected rectangular area:
No0.jpg
Did you expect this:
No1.jpg
or this:
No2.jpg
(black areas transparent) or something else?

[Parvat]

I still don't know what you expected to see.
For this input and selected rectangular area:
No0.jpg
Did you expect this:
No1.jpg
or this:
No2.jpg
(black areas transparent) or something else?

Finally you got it what i mean to say
For the image you gave
i expected 1st output .
No1.jpg
back area Transparent

Thanks Chris for understanding my query.

[ChrisW67]

Then my previous example code is exactly what you need.
Construct a rectangle of the specified size.
Construct a transform to rotate and shift it to the specified coordinates.
Make a mask using a transformed painter
Apply the mask as the alpha channel of a copy of the image.
Profit.

[Parvat]

Thanks .finally got it .