Tracing an image point by pointThe

Tracing an image point by point

The masking techniques that I demonstrated in the previous chapters are great for selecting filigree detail such as hair. But they don't always work out as successfully for smooth, well defined contours, such as those associated with faces manmade objects and product shots. Enter the Pen tool. This elegant but demanding drawing tool allows you to trace any smooth, well-defined contour on a point by point basis. Like the shape tools that I reviewed back in the intermediate tools, the Pen tool draws a vector based outline.

But instead of creating a shape layer, it results in a freeform path that you can use to select portions of an image. For example, let's say I want to select this glass. I'll click here with the pen to create what's known as a corner point. Then I'll click here to create another one. Photoshop automatically connects the points with a straight segment, just as you would with a connect-the-dots puzzle. That segment ends up shaving off the side of the glass, however, so I'll click with the pen to add another point right here in the middle.

This is a smooth point. Now I'll scoot the point over, and you can see how the smooth point adds curvature to the neighboring segments. See these levers coming off the point? They're called control handles. Notice if I drag a handle, the other handle moves in the opposite direction, and both segments curve in the directions of the handles. It's like the handles are magnets, and the curves are attracted to them. The pen tool requires skill, determination and a fair amount of manual labor.

But in the right hands, it's the most capable tool for selecting complex surfaces in all of Photoshop.

結果 (中文) 1:

描摹图像点的点掩蔽技术证明在前面的章节很棒选择掐丝细节就像头发。但他们不总是一样成功地为工作顺利、 定义良好的轮廓，例如那些与面孔人造物体和拍摄的产品相关。输入钢笔工具。这优雅但苛刻的绘图工具允许您跟踪任何光滑的、 良好定义的轮廓，在由点的基础上。像中间工具回综述了形状工具，钢笔工具绘制一个基于矢量轮廓。但是，而不是创建形状图层，它会导致任意形状的路径，您可以使用选择的图像部分。比如说，我要选择这种玻璃。我会用笔来创建所谓的角点请单击此处。然后我会在这里单击以创建另一个。正如你将与连接点益智，Photoshop 会自动连接的直线段的点。那段最终剃去了侧的玻璃，然而，所以我将单击用笔可以在中间添加另一个点，就在这里。这是平滑点。现在我将往，旁边靠点，你可以看到如何平滑点添加相邻段的曲率。看到这些杠杆点下来吗?他们被称为控制手柄。注意是否在拖动柄，其他的句柄在相反的方向和两段曲线中的句柄的方向移动。它就像磁铁，句柄是曲线被吸引到他们。钢笔工具需要技巧、 测定和相当数量的体力劳动。但是在正确的人手中，它是在所有的 Photoshop 中选择复杂曲面的最有能力工具。

結果 (中文) 3:

跟踪图像逐点

掩蔽技术，证明了我在前面的章节中都伟大的选择如头发细节精细。但他们并不总是解决成功顺利，良好定义的轮廓，如那些面孔的人造物体和产品拍摄相关。进入钢笔工具。这个优雅但要求很高的绘图工具可以让你追踪任何平滑的，逐点定义的轮廓。喜欢的形状的工具，我回顾了在中间的工具，钢笔工具绘制一个矢量轮廓。

而是建立一个形状图层，结果在一个任意形状的路径，你可以选择一个图像的部分。例如，让我们说我想选择这个玻璃。我会用钢笔来点击这里，创造出一个叫做角点的东西。然后我会点击这里来创建另一个。PS图象处理软件自动连接点的直线段，正如你将与一个连接点之谜。然而，这部分结束了刮胡子的玻璃，所以我会用钢笔来增加另一个点在这里的中间，这是一个光滑点。现在我又点上，你可以看到光滑点增加曲率对邻近节段。看到这些杠杆来了吗？他们被称为控制手柄。注意，如果我拖动手柄，另一个手柄朝相反方向移动，并且两段曲线在手柄方向。它像手柄是磁铁，和曲线都吸引他们。钢笔工具需要技巧，和大量的手工劳动的决心。

但在右手，这是在所有PS图象处理软件复杂曲面选择最得力的工具。