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The crop command of ImageJ does not give correct dimension

I have an image that is 2048*2048. When I run the following macros:

makeRectangle(304, 304, 1450, 1450);
run("Crop");

it then results in an image of 1450*1450. Why not (1450-303)*(1450-303)?

Solution

  • Because makeRectangle expects the x and y coordinates of the upper left corner, as well as the width and height (not the coordinates of the lower right corner) of the rectangular selection.

    The line

    makeRectangle(304, 304, 1450, 1450);

    is equivalent to 

    run("Specify...", "width=1450 height=1450 x=304 y=304");

    (see also the ImageJ user guide)