image-masking

I am new to matlab and am working on Image processing. I am using the roipoly function to create a mask. As I understand I can use it like this : I = imread('eight.tif'); c = [222 272 300 270 221 194]; r = [21 21 75 121 121 75]; BW = roipoly(I,c,r); figure, imshow(I) figure, imshow(BW) The image is shown below : One observation I had was that the interpolation between the adjacent points as specified by the c & r matrix is done by 'Linear Interpolation', in other sense always a straight line is drawn between the points. Can it be possible that somehow other types of interpolation are

I have an RGB image (M x N x 3 matrix) in MATLAB that I read in. I also have a Binary mask (M x N matrix) for the image, which is simply 0 for some region of interest and 1 everywhere else. I'm trying to figure out how to mask the RGB image with that binary mask. I've tried changing datatypes around (working with either double or uint8 to see if results change, but sometimes they don't or I get an error) and I've tried using various functions like conv2, immultiply, imfilter, and so on. What I currently do is try to apply the mask individually (as it is size M x N) to each R, G, and B channel

Aside from the fact that the question asked here : Draw a hole in a rectangle with SpriteKit? has not satisfactorily been answered in its own right, the most significant difference between the two is that this question requires an absence of workarounds and specifically asks about reversing the functionality of SKCropNodes. The primary concerns in this question cannot be addressed by the type of hacky ways the above question could be answered due to the randomness of the holes, the number of holes, and the variation in objects to which the holes are to be applied. Hence the Swiss Cheese