When you run the program, be sure to pass the name of a PNG image file on the command line.

运行该程序时，请确保在命令行上输入了png图像文件的名称。

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And to have a 50% gray displayed, you need an image value of about 75% (you can see the red dotted line).

并有50%的灰色显示，则需要约75%的形象价值(你可以看到红色虚线)。

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The 'lines' need not be actual lines - they could be the shape of a path, a line of trees, a fence, river or any other feature in an image.

所谓的线并不是条实际存在的线——它可以是一条小路、一排树、一排围栏、一条河或者其他任何在图中出现的东西。

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Fuller has tried to clean up its own act recently, brushing up its image with a new website and a line of kitchen and bathroom cleaners and an expanded retailer relationship.

FORBES: A Foot in the Door No More

The discovery of the image found on surveillance footage from a department store near the finish line emerged two days after the attack that left three people dead, wounded more than 170, and cast a dark shadow over one of this city's most joyous traditions.

NPR: Image Leads To Hunt For Boston Bombing Suspect

To remedy that image, she was enlisted two years ago by Amorim to start Materia, a line of trendy products developed by Portuguese, French and Japanese designers.

WSJ: Cork's Popping Potential