how to make an occlude image

i am doing occluded face recognition for my final project. first, i input regular image which is not occluded. then i have to do experiments for occluded image. i used paint to make a square on the face image to make my image occluded. but when i try to test it with my code, it turn error. I found that the image that i edit with paint to make the picture occlude is 112x92x3. The input image should have the same size with the image that i already trained before which is 112x92, but it become 3 dimension. How do i want to make it 2 dimension only and make my image occluded. Please help me....thank you

Answer 1

[David Young]

Assuming you have the Image Processing Toolbox, try using rgb2gray to convert your image to 2-D.

Alternatively, why use paint to occlude the image? Simpler to just change it within MATLAB.