Question
Hi, I have a code for the Manual thresholding and I am unable to run the code correctly. I am using two images to do the thresholding. The imorig is the below original image and the im is the below segmented image. I want to do thresholding with the help of two images. this is how i run the code: >> im=imread('5013lt685dapi_segmented.tif'); >> imorig=imread('5013lt685dapi.tif'); >> name='abc'; >> manual_thresh(im,name,imorig); AND THE ERROR I AM FACING IS Error using set Bad property value found. Object Name: image Property Name: 'AlphaData'. Error in manual_thresh>update_plot (line 239) set(h_ax1, 'AlphaData', bw); Error in manual_thresh (line 180) update_plot
Expert Answer
Neeta Dsouza
PhD Expert
Answered Aug 24, 2026
If you put a breakpoint at line 239
set(h_ax1, 'AlphaData', bw);
you will observe that bw will have the same dimensions as your input image. So if the input image is mxnx3, then bw will be mxnx3 as well.
In order to use nonscalar alpha data, you need to specify the alpha data as an array equal in size to CData of images and surfaces or…
Since CData is your original image, your bw has the correct size in width and height (mxn). What is not all that clear from the notes but probably should be based on the context is that your AlphaData should be mxnx1. Your line of code then becomes
set(h_ax1, 'AlphaData', bw(:,:,1));
Try this and see what happens.
100% Run Guarantee
3-Hour Fast-Track Delivery
Need a Custom Version or Complete Simulation for This Problem?
Our 500+ PhD engineers build, debug, and optimize working MATLAB scripts and Simulink (.slx) models tailored to your exact assignment rubrics with zero plagiarism.
Tested on MATLAB R2024b / R2026a
Turnitin 0% Plagiarism Report
Free 7-Day Revisions Guarantee
Have a different question? Ask here
Related thresh Questions & Solutions
Browse All →
Explore similar technical troubleshooting questions and verified MATLAB solutions:
Ready-to-Run MATLAB & Simulink Projects
Browse All Projects →