Value, Light, and Form
AP Drawing Topic 2 7:38 English narration · English + 中文 subtitles burned in
Chapters
Transcript
Look at this room.
看看这个房间。
Almost all of it is dark.
几乎全都是黑的。
One small light is hidden behind the boy in the middle, and it is the only light in the picture.
中间那个男孩身后藏着一盏小灯， 它是画面里唯一的光源。
Yet you can still read every face and every hand.
可你依然能看清每一张脸、每一只手。
Nothing here is outlined: the picture is built from light shapes against dark ones.
这里没有任何轮廓线：整幅画都是由亮的形状和暗的形状搭起来的。
A drawing can do the same with almost nothing.
一张素描用极少的材料也能做到同样的事。
Brown ink, a pen, and a few washes of that same brown.
棕色墨水、一支笔， 再加几层同样棕色的淡彩。
One colour, one brush, and the room still turns from light into deep shadow.
只有一种颜色、一支笔， 房间依然从明亮转入深深的暗部。
So how do you learn to see like that?
那么，怎样才能学会这样去看？
You start with a scale.
先从一把"尺子"开始。
This is Topic Two: value, light, and form.
这是第二单元：明度、光与形体。
How light falls on things, how you copy that with a pencil, and why it decides your portfolio score.
光如何落在物体上，你如何用铅笔把它画出来， 以及它为什么决定你的作品集分数。
Value means lightness and darkness. Nothing else.
明度就是明与暗，别无其他。
A value scale runs from white, through the greys, down to black, and drawing a smooth nine-step scale is the classic control exercise.
明度阶从白，经过各级灰，一直到黑； 画出一条均匀的九级明度阶，是最经典的控制力练习。
Now watch the two shapes.
现在看这两个形状。
Both are circles.
它们都是圆。
The left one has a single value, so it stays a flat disc.
左边那个只用一个明度，所以它始终是一块平面圆盘。
The right one is given four values, and it becomes a ball.
右边那个被赋予四个明度，于是它变成了一个球。
Four words you must use exactly.
有四个词你必须用准。
The value scale is the ladder itself: white at the top, black at the bottom, nine steps between.
明度阶就是那把梯子本身：顶端是白，底端是黑，中间九级。
A high-key drawing lives near the light end and feels airy; a low-key drawing lives near the dark end and feels heavy.
高调的画停留在亮的一端，感觉轻盈；低调的画停留在暗的一端，感觉厚重。
Local value is the object's own lightness — a black mug stays dark even in bright light.
固有明度是物体表面本身的明暗——黑色的杯子在强光下依然是暗的。
And squint at your subject: squinting throws away detail and shows the big value shapes.
还有，眯眼看你的对象：眯眼会甩掉细节，让你看见大的明暗形状。
Now the mistake that costs marks.
现在说说最容易失分的错误。
Most beginners draw everything in the middle of the scale — timid greys, nothing truly dark, nothing truly bright.
大多数初学者把所有东西都画在明度阶的中段—— 怯懦的灰，没有真正的暗，也没有真正的亮。
From across the room that drawing looks flat, and scorers see it constantly.
隔着一段距离看，这样的画是扁的， 而评分老师天天都能见到。
So push your darks.
所以，把你的暗部压下去。
Put a real black near a real white in every piece.
每一张作品里， 都要让一块真正的黑靠近一块真正的白。
A confident full value range is a score signal — what separates a strong portfolio from a weak one.
完整的明度范围是得分信号—— 正是强作品集和弱作品集的分水岭。
One light source makes the same pattern on every object.
一个光源在每一个物体上都造出同一种规律。
Learn the pattern once and you can draw anything.
把这个规律学会一次，你就什么都能画。
The highlight is where the light hits square on.
高光是光正面打上去的地方。
Next comes the mid-tone, the surface's true value.
接着是中间调，也就是表面本来的明度。
Then the core shadow: the darkest band on the form, where the surface turns fully away.
然后是明暗交界线：形体上最暗的一条带，表面在那里完全背光。
Below it, reflected light bounces up from the table.
再往下，反光从桌面弹回来。
And on the ground lies the cast shadow.
而地面上躺着的是投影。
Now the mistake almost everyone makes.
现在说几乎人人都会犯的错。
Beginners put the darkest tone right at the outside edge, like an outline, and the ball goes flat.
初学者把最暗的调子放在最外边的轮廓上， 像描了一圈边，于是球就扁了。
Here is what really happens.
真实的情况是这样的。
The darkest band sits just inside the edge — that band is the core shadow.
最暗的那条带 落在轮廓稍稍往里的位置——那条带就是明暗交界线。
The rim itself is lighter again, because light bounces off the table.
而最外的边缘反而更亮， 因为光从桌面弹了回来。
And here is the rule scorers look for: reflected light is never lighter than a lit halftone.
这里就是评分老师要看的那条规则： 反光永远不会比受光面的中间调更亮。
One line to remember first: reflected light is always darker than any lit halftone.
先记住一句话：反光永远比任何受光的中间调更暗。
Now the cast shadow.
再说投影。
It is darkest and sharpest where it touches the object, then softer and lighter as it stretches away — draw it that way and the object sits on the table.
它在紧挨物体的地方最深、最锐利，越往外越淡、越柔—— 这样画，物体才真正坐在桌面上。
And the edges tell you the shape: a hard edge means a sharp turn, a soft edge means a slow turn.
边缘则告诉你形状： 硬边意味着急转的面，柔边意味着缓转的面。
Rendering means building believable volume, and three habits do most of the work.
塑造，就是把可信的体积一点点搭起来，靠的主要是三个习惯。
Simplify: every complex subject reduces to basic forms — spheres, cylinders, cubes and cones, so render those first.
先概括：任何复杂对象都简化成基本形体——球、圆柱、方块和圆锥，先把这些体块画出来。
Work in one direction, dark to light — jumping around destroys the value structure.
再按一个方向走，从暗到亮——来回乱跳会毁掉明度结构。
And blend on purpose with a blending stump: marks you keep often read stronger than a surface you have rubbed smooth.
还要有目的地用擦笔揉擦：保留下来的笔触，往往比擦得光溜溜的表面更有力量。
Above all, keep the lit side and the shadow side apart.
最重要的是，让受光面和背光面泾渭分明。
Look at how the old masters actually built their values.
看看大师们究竟是怎么把明度做出来的。
Dürer's hands are made of fine parallel lines, and where the lines crowd together and cross, the tone deepens.
丢勒画的手全是细密的平行线， 线条挤得越密、交叉得越多，调子就越深。
Michelangelo's study is the same: almost no blending, just marks laid at the right density.
米开朗基罗的习作也一样： 几乎不揉擦，只是把笔触按合适的疏密排上去。
Value and mark-making are one skill.
明度和笔触，本来就是同一门功夫。
Chiaroscuro means light-dark: one strong light against deep shadow, so the subject steps forward out of the page.
明暗对照法的意思就是明与暗：一束强光对着深深的暗部，主体于是从纸面上走了出来。
Seurat drew this man with a conté crayon on rough paper, and there is almost no outline in it.
修拉用炭精笔画在粗纹纸上，画里几乎没有一根轮廓线。
The hat is a solid dark mass.
帽子是一整块结实的暗。
The profile appears only where a light edge meets that dark.
侧脸只出现在亮边碰上那块暗的地方。
The coat sinks away below.
大衣则在下面沉了下去。
Push this further, until one small area blazes in darkness, and it has a name: tenebrism.
把这一手再推远一点，直到只剩一小块地方在黑暗里发亮，它就有了自己的名字：暗色调主义。
Before any of that, plan.
在做这一切之前，先做规划。
Thumbnail sketches let you test value plans in minutes.
小稿可以在几分钟内试出几种明度方案。
Notan is the design of the light and dark shapes: a drawing works or fails at thumbnail size, before any detail exists.
明暗构成，就是设计亮形状和暗形状：一幅画在小稿大小、还没有任何细节的时候， 成败就已经定了。
Squint, and reduce your scene to two or three flat values.
眯起眼，把场景归纳成两三个平的明度。
On the left the darks are connected into one linked shape, and it reads instantly.
左边，暗部连成一整块形状， 一眼就读得懂。
On the right the same dark is scattered into spots, and it reads as noise.
右边，同样多的暗被打散成一个个斑点，读起来就是噪音。
So group your values, and put your darkest dark against your lightest light at the focal point.
所以要把明度归拢成组，并且把最暗的暗紧挨着最亮的亮，放在视觉焦点上。
Here is a different way to start.
还有一种完全不同的起手方式。
Cover the whole sheet with an even grey tone — a toned ground.
先把整张纸铺上一层均匀的灰——这就是有色底。
Now you can draw in two directions.
现在你可以朝两个方向画了。
Press darker with the charcoal to build the shadows.
用炭笔往下压，把暗部做出来。
Then lift the lights back out with an eraser: a kneaded eraser dabs soft lights, a hard eraser cuts crisp ones.
再用橡皮把亮部提出来：可塑橡皮轻轻一按，得到柔和的亮；硬橡皮一划， 切出锐利的亮。
That is subtractive drawing: the eraser has become a drawing tool.
这就是减法素描：橡皮已经变成了一支画笔。
This process is visible experimentation with materials.
这个过程正是材料上的可见实验。
And because you begin in the middle of the scale, nothing can hide behind white paper.
而且因为你从明度阶的中间起步， 什么都没法躲在白纸后面。
Include one white-object study in your practice images.
练习作品里要包含一张白色静物写生。
Let's plan one all the way through.
我们把一张画从头规划到尾。
Three white eggs and a folded white cloth, with one lamp from the upper left.
三枚白鸡蛋和一块折起的白布，左上方一盏灯。
Step one: squint, and find the three big shapes — the lit cloth, the shadow side of the eggs, and the cast shadows they throw.
第一步：眯眼，找出三个大形状—— 受光的布、鸡蛋的背光面，以及它们投下的影子。
Step two: draw a thumbnail, five centimetres wide, and connect those cast shadows into one linked dark shape.
第二步：画一张五厘米宽的小稿， 把那些投影连成一整块暗形状。
Step three: fix the values before you touch the big sheet.
第三步：在动大纸之前先把明度定下来。
The lit cloth is a two.
受光的布是二号。
The shadow side of the eggs is a six.
鸡蛋的背光面是六号。
The cast shadows are an eight — your darkest dark, sitting right beside your lightest light, so that junction becomes the focal point.
投影是八号——那是你最暗的暗，而它紧挨着你最亮的亮， 于是这个交界处就成了视觉焦点。
Step four: render dark to light, and never let a halftone creep into the shadow side.
第四步：从暗画到亮， 绝不让中间调爬进背光面。
And why does this study score?
那么这张写生凭什么得分？
The objects are white, so every value on the page came from light alone.
因为对象是白的，纸上的每一个明度都只来自光。
Three things scorers notice.
评分老师会注意三件事。
One: the full value range.
第一，完整的明度范围。
Weak portfolios are grey on grey, so put a real black and a real white in every piece.
弱的作品集总是灰压灰， 所以每张画里都要有一块真正的黑和一块真正的白。
Two: reflected light.
第二，反光。
If it glows brighter than your lit halftones, the form collapses.
如果它比受光面的中间调还亮，形体就垮了。
Three: photograph dark drawings carefully.
第三，认真给暗部画拍照。
Charcoal blacks crush to a flat mush in bad light, so check the range on screen before you submit.
光线不好时，炭笔的黑会糊成一团，所以提交前先在屏幕上检查明度范围。