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first, your cvtColor call is useless, beacuse ppm's can have at most 3 channels, and you're reading it as bgr.

then, you got rows and cols wrong in Size(rgbImage.rows, rgbImage.cols)

and last, for a multi-dimensional Mat you cannot use rows and cols, those apply only in a 2d world. use:

int N = blob.size[0], C = blob.size[1], H = blob.size[2], W = blob.size[3];

there's also an operator for printing:

cout << blob.size << endl; // NO () !

first, your cvtColor call is useless, beacuse ppm's can have at most 3 channels, and you're reading it as bgr.

then, you got rows and cols wrong in Size(rgbImage.rows, rgbImage.cols)

and last, for a multi-dimensional Mat you cannot use rows and cols, those apply only in a 2d world. use:use Mat::size instead:

int N = blob.size[0], C = blob.size[1], H = blob.size[2], W = blob.size[3];

there's also an operator for printing:

cout << blob.size << endl; // NO () !