How to crop the image within certain limits?

I have the picture :

and i want crop it like this (in certain values):

thanks!

[DGM]

You say you want to crop "in certain values". Does that mean that you want to select the cropped region based on array values? If so, then is the actual data an mxnx3 RGB image, or are you dealing with a pseudocolor representation of a mxnx1 array? In other words, what values are you using to determine the output? Is it some color in 3D RGB space, or is it some value in a 1D data space?

Answer 1

[KSSV]

Read about imfreehand, Freehand.

If you know thoese certain values. Use contour to get the closed region of the required region of interest. Then use inpolygon to extract your required region.