用Photoshop画云

2004-2-14 7:17:00　　作者：mbsky　　来源：5d 多媒体　网友评论 0 条　论坛

　　

Painting clouds 画云

（　原文作者Steven Stahlberg，line126翻译。）

I used Photoshop, but any paint program should work. 

我用Photoshop，不过用任何其他绘图软件也可以。

 

(Left, cropped from a larger image.) 
I start with a ramp like the one on the right; be careful not to use full saturation here.  Up to your preference, if you want to make the background a little more purple.

（左图是从一张大的图上截下来的）

我从一个渐变开始，如右图；小心这里不要用全部的饱和度。如果你想把背景弄得更紫一点，可根据需要而定。

Start painting with max saturation and max value a 'peachy' color on a large default brush (sharp edge, pressure-sensitive opacity).  Quickly block in the rough shapes where light would fall on your cloud. 

Take special care here (and any time you're painting something in nature) to not be too predictable, symmetrical or regular. 

Go down in brush size and do some more detailed strokes.

开始用混合的饱和度并混合一个“桃红色的”的颜色在一只定义好的大号笔刷上（明显的边缘，有压力感的饱和度）。快速地在光线投射到云的地方画出大体形状。

在这个地方特别注意（包括任何时候你画自然界的东西）不要太死板、对称或规则。

减小笔刷的大小进行细节的刻画。

The shadow color is added, a purple so dull it's almost gray.  Then add the darker orange/red color wherever the peach meets the shadow.  Also, normally, clouds will be brighter at the top so add it at the base too.

增加阴影的颜色，一个接近灰色的紫色。然后在明暗交界处增加较深的桔红色/红色。同样的，通常，在高处云会比较的亮，所以在底部也增加一些。

 

 

Now the highlight color, a slightly lighter peach.  Use the finest brush and squiggle it on wherever there's a left-hand facing edge of the cloud.  Again, don't be predictable and regular.  We need to soften the right-hand side edges of all these squiggles, while trying to keep the left sides as sharp as possible.  You can use a small blur brush, or a smear, or simply paint back the base color into the highlight.Go back and forth, adding more highlight squiggles, softening some parts, bringing the shadow color in with a finer brush too in some places, etc.On the right is the finished cloud.

现在轮到高光了，用一个很浅的桃红色。用最细的笔刷曲线在云朵的左边边缘。再次强调，不要太死板和规则。我们需要把云的右边的边缘的曲线弄得柔软一些，同时使得左边尽可能的锐化。你可以用小号的模糊工具blur，或者涂抹工具smear，或者就是把底部的颜色画一些在高光处。向前向后，加上更多的高光曲线，模糊某些部分，同时用小点的笔刷蘸上阴影的颜色画在某些地方，等等。右边是完成后的云彩。

Here's a cloud similar to one I saw today, around noon, near the horizon, through my office window.  The light is coming not from the side or above, but about 45 degrees or so.  This changes where you need to put the highest values; instead of at the edge of each blob of cloud the highest value ends up pretty much centered.  So a different technique will be more efficient.

这是个和我今天看见的云朵有点像的，在中午时分，接近地平线，从我的办公室的窗户看到的。光线不是从边上或者顶上来的，而是从大约45度的地方。这改变了你要画最亮的地方的位置；不是在云朵最高的一团，亮部占据了中心部分。所以有点不同的技术会更加有效。

 

Use a similar ramp to the above, just a bit lighter. 

用一个和上面的例子差不多就是亮一点的渐变。

Create a new layer and paint with a sharp edged brush a value slightly lighter and less saturated than the lightest sky color.  Darken it a bit at the bottom.

新建一个层，用锐利边缘的笔刷和笔最亮的天空颜色亮一点低饱和度的颜色。在底部加深一点。

Turn on 'Preserve Transparency' for the layer and paint full white with the airbrush like this.  Vary the brush size quite a lot.  The goal is to get this kind of 'cauliflower' look. 

用“Preserve Transparency”（保留透明度）的叠加方式，用airbrush像这样画上白色。不断改变笔刷大笑。目的是得到有点像“花椰菜”的样子。

Then add another layer and paint with a fully opaque sharp edged brush the original cloud color, like on the right.

Same thing again, switch on 'Preserve Transparency' and paint white with the airbrush. 

Repeat this cycle until the whole cloud area is filled up.  Remember to try to get the edges of each layer a little closer in the beginning, and more widely spaced towards the end (due to the perspective).

重复这些循环一直到整个云的区域被填满。记得试着使每个层的边缘有一点接近开始，但是更多的空间接近末尾（取决于透视关系）。

On the right is the finished cloud, note that you can tweak it very easily by using 'Curves' on each layer.  I darkened the first layers, also changed the coloring a little.  Other tweaks included some added detail on the bottom layer, and airbrushing more white here and there.

右边是完成的云，注意到你可以非常容易地在每个层用“曲线”来改变它。我加深了第一个层，所以改变了一点颜色。其他的改变包括在底层增加了一些细节，用airbrush在某些地方增加了更多的白色。
Of course instead of the airbrush you could try this with all sharp edged brushes, for a more painterly expressive style.

当然除了airbrush你可以试试别的所有的锐利边缘的笔刷，为了一个更有绘画表现力的样式。
 

（全文完）

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