Nearly perfect, but...

Works well, but one tweak would help me a lot--the crosshairs do not appear to be a single pixel wide. At normal 100% view, they look fine, but when zoomed in to, say, 800%, I can see that there is a faint, mostly transparent colored line on either side of the main guidelines (antialiasing?). Try measuring a dark or black box. These faint lines get in my way, and make it difficult to select the exact starting/ending points that I want. A very minor point, yes, but I thought it was worth mentioning. Another reviewer requested a magnified area to help with precise selection. That would work for me, too, but without it, I just zoom in on the whole screen, and thats when I noticed these extra faint lines. Another request would be to provide the option of INCLUDING the crosshair lines in the measurement, because thats the way the Macs screen shot tool works, and Im used to it. AND, an option for OPACITY of the crosshairs would be sweet--Id make my crosshairs bright yellow with about a 50% opacity so that I could see whats behind them while Im positioning them. With all those changes, this would be a six-star app! :-)

PixelTwiddler about Euclid