Importing PNG File, scaling in X axis is wrong?

I created a simple PNG in GIMP of a black rectangle on a white background. The units used in the image are inches and the x and y resolution are 72pixels/inch. The rectangle is 3.75x2.25 inches. In gimp, everything looks perfect, I can use the measuring tool to verify the dimensions. My goal is to use my mill to cut out a box of this shape 1/2 inch deep. In EMC, I open the PNG file and use the Image to gcode tool. I choose the appropriate values of Pixel size of 0.013888889 inches (1/72). When the file gets imported, the Y axis is fine, it is 2.25 inches in length. The X axis however is somehow shorter than it should be, only 3.5 inches. Of course I did not notice this, and already went through the milling process twice with the same results (luckily just cutting Styrofoam). I can't figure out why it is scaling the X axis wrong on the image. Has anyone seen this?

Thanks,
Eric Seifert

Initially this is what I thought, but then actually looking at the screen, the total length of the box on the screen (in EMC2/Axis) was only 3.66 inches, so it could not be right, it would have to be at least 3.75 inches. I should note that after posting, I rotated the image 90 degrees and imported it and confirmed that now the 2.25 inch side is only 2.11 inches and the 3.75 inch side is not correct. I was using the "columns" mode. I then tried "rows" and this seemed to flip the issue, to the other axis again, so then next I used the original image again and did columns and rows, and now I think both sides are correct. So it seems to be related to this.

Okay, good enough, I am fairly new to this and still trying to get a hang of the myriad of different software that is available and what is best for each purpose. Also, just starting messing around with hand writing g code, and its not too bad so I can certainly do that. The pocket generator looks to be exactly what I needed.

Thanks,
Eric Seifert