Stride and Width in image processing

Question

I HAVE A 1bpp image that needs to be read.

I came across the following logic. but I am not sure what it is trying to do.

     int value = (imagebmd.Width + 15) >> 3;       
     byte* row = (byte*)imagebmd.Scan0;

I don't understand what value is stored in columns and row variables.

Answer 1

int columns = (imagebmd.Width + 7) >> 3;

This is byte length of image line. It is equivalent of rounding up

columns = Ceil(bitwidth / 8)

row is pointer to image data start address.