problem with reading pixels from the scren

Unity Engine
1

hi, i have a little problem to understand Texture2D.ReadPixels function. basically i understand the part of the
Rect that i need to read but other part with DestX and DestY confuses me and i am not able to render the texture
of the read pixels where i want on the screen. check out the attachment i made.

and here is the code i used:

// Create a texture the size of the screen, RGB24 format
 var width = 250;
 var height = 600;
 var tex = new Texture2D( width, height, TextureFormat.RGB24, false );
 // Read screen contents into the texture
 tex.ReadPixels(Rect(5,250, 250, 600), 10, 10 );
 tex.Apply();

i am confused with last two parameter, how to use them? thanks!

2

The destX and destY are the offsets within the destination texture (the rectangle originating at that point is the same size as the source rectangle). If you want to fill the destination texture completely with the grabbed image data then make the texture the same size as the grabbed rectangle and set destX and destY each to zero.