Get color area

[jueqing1015]

As shown in the figure below, the background in the figure is white and there is a black area. Is there a way to get the position of the black area?The black area is just a rectangle
It is a bit like the existing Trim() function, but the Trim() function cannot get the cropped information

[dlemstra]

You can get the information from the image.BoundingBox method. You might need to set image.ColorFuzz to make sure you don't get some of the gray pixels close to the black area.

[dlemstra]

I don't understand why the BoundingBox property does not give you the necessary information.

[jueqing1015]

The information is there, but now I want to draw a rough rectangle on the image first, and then perform BoundingBox based on the drawn rectangle
I tried to use RegionMask but it still targets the entire image

[jueqing1015]

@dlemstra
May I ask if the method I said is achievable?
Specify an area on the image and perform the BoundingBox operation

[dlemstra]

You will need to create that yourself. You can use your program to draw an area on the image and then you will need to remember the coordinates. And then with these coordinates you can use .Clone(IMagickGeometry) to clone an area of the image.

[jueqing1015]

thank you very much