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COLOURED PENCIL TOPICS

Perspective

I am indebted to Professional UK Artist and Tutor, Paul Talbot-Greaves for permission to use some elements of his excellent set of articles on perspective published in 2009 A COMMON COMPLAINT...... ‘I can’t get my head around ‘Perspective’ – all those lines and things’ Lines are essential to explain linear perspective, but most artists, once they understand the principles, manage without drawing guide lines, they simply check with a ruler or follow along the side of a pencil The word Perspective is derived from the Latin word perspicere, meaning ‘to see through’   We have a perspective on something.  We can see it from a particular position., and that  view is particular to the position we are in. If we move, the perspective changes.   The word has come also to refer to the way a three dimensional view is seen in two dimensions. The original theories of perspective were developed by the ancient Greeks and perfected over many centuries.   Look at any book on the subject and you will be faced with many diagrams – some more complicated than others. They try to explain the subject, but some may often succeed in confusing the student more than ever.
The artist must be aware of two types of perspective in drawing and painting 1/Arial Perspective and        2/Linear Perspective Arial Perspective relates to the effect of light interference between the viewer and the different parts of the subject.   Thus distance shows up as paler and cooler in the colour temperature as it recedes. Linear Perspective relates to the shapes you see in the landscape (or still life). For example the way we see a road recede or the walls of a barn or house and how the windows and walls appear to your eyes. The basics are pretty straightforward but the drawing is not always as easy. Let us start with Arial Perspective Arial perspective can be defined as the distance between your viewpoint and the background or horizon within a scene and how we determine the position of elements of our picture from the relative colour and definition of them.   Sounds tricky! , but it is simpler than it sounds. First the viewpoint:  This is the position from which we have painted or photographed our scene. The distance or horizon is very subjective. It may be a few feet away, or it may be miles away. Whichever it is, it will be affected by the scattering of light caused by dust particles and water vapour in the atmosphere. It is this interference which causes the distance to appear paler, and often more blue in colour. When constructing a picture, we often try to compose it so that the three dimensions we see with our two eyes can be replicated as much as possible on the two dimensions of the paper surface. We want the viewer to get the feeling of distance and separation between the foreground, mid ground and more distant features, whether these are in an extensive landscape, a town view or a still life on a shelf.   We can achieve this separation in three ways. Firstly, by using colour.  Blues and colder colours tend to retire into the background, reds and yellows convince the eye that they are closer to hand Secondly, by using definition.  We can keep sharply defined edges and surfaces to the foreground and allow features to become less distinct as they appear further away. This mimics the way the eye sees objects when it focuses on something in the front of the viewer, and loses definition where the eye isn’t looking. Thirdly, in the strength of colours we use. Paler colours sit back, while brighter and stronger colours come forward. ( Illustration to come ) These are not hard and fast ‘rules’ any more than any other rules are in the art world.  They are simply guides that have been found to work, and you may well see examples of cases where an artist deliberately breaks the rules to achieve an effect.  Think of cases where the foreground of a landscape is under grey cloud with colours and definition reduced in the cold grey light. However the artist has seen an area in the more distant part of the scene where bright sun catches a hillside and buildings, and shows them up in clear, bright colours against a stormy sky. No doubt you have seen such scenes yourself and stopped to take them in. There are several ways we can work our painting to show the separation between the areas. We can take the opportunity to emphasize the separations by deliberately showing more blues to the back and more reds to the front of the picture.  The distant blues tend to be Blue/Violet in shade so be careful of your choice of blues, and stay away from the Green/Blue mixtures. We can add more white to the actual colours we show for the background – choosing more pastel versions of the colours we see.   We can hint at features in the background, rather than show them in every detail – a real challenge for the realist artists among the Coloured Pencil fraternity! We can sometimes take the opportunity to show the effect of rain in part of our picture by reducing the definition and colour in that particular area. A heat haze on a hot summer day could be emphasized – you don’t have to stick too rigidly to your reference – especially if it is a photo – as the colours shown in photo print can be way out from the actual colours seen on the day. You always have the opportunity to improve on the scene. Even though the distant view may be far off, and you can still see plenty of detail in buildings, walls and trees, this doesn’t mean you have to show the detail.  Just remember the principles of Arial Perspective, and tweek your composition to allow for the separation of areas – even though the picture may be only of a pot on a shelf !
Linear Perspective Whilst Arial Perspective looked at the way the effects of light show distance, Linear Perspective relates to shapes and how we see them as they recede in a picture and as they become more distant. The way these shapes are formed and change and can be transferred to the flat plane of the paper surface can be the hardest part to grasp.  Sometimes we look at a picture and ‘something is wrong’ but we can’t just see what it is.  Stand back and look from a little way away, and many times you will see that a point of perspective is wrong. Look at this mural from the wall of an Italian Restaurant. Venetian buildings are frequently out of line with windows and walls askew as the old buildings have settled over the centuries. In this case, I feel that the artist had a little too much Chianti to drink during his lunch break.  Look at those top windows on the left. Look at the windows just visible on the right in the arch of the tree branch and compare the top of the window line with the sill line below. In both these examples I have marked the correct line in red ( left ) and blue ( right) which you can compare with the artists lines shown in yellow The whole picture annoyed me so much during a meal sitting facing it, that I went back again the next day to take a camera to photograph it. The Maitre’D was so proud I wanted a record of the mural on his wall ! Just for the record I show three actual Venetian examples below and to the left.  The perspectives in Venice are always askew because of the way the buildings are sliding into the mud, but my mural example is just a step too far !
The basics of Linear Perspective may be relatively easy  to understand. The difficulty is often in doing the drawing bit!   We will start with the simplest of exercises.   The first fact we need to know, is where our eye level is Sounds odd, perhaps, but it is crucial and needs to be settled at the outset.   Normal landscape and townscape pictures assume an eye level of about 5 feet from the ground. This is the average height a pedestrian will be looking at the scene. His or her eyes will be about that height from the ground. If you are seated and painting a scene, then your eye level will be lower and the perspective of buildings and people walking about will be different.  If you crouch down or lie on the floor, the perspective will be very different.   That eye level can be projected forward and will rest on a point in the distance, somewhere around where the horizon would fall if we could see it.  This eye level is vital to our picture making. If you can’t see any distant horizon, then a level line between your eye and the distance will serve as the basis of the construction of your scene.  Look at the image below
The eye level line is perfectly horizontal, and the building seen at that level would display no roof structure – just the end of the building and the trees and bushes beside it.   If we were to see it down below us at the base of the slope, our view would still look at the end of the building.  However, note that because we are above the roof level, the whole shape of the building has changed and we see more of the roof. If you are looking at a scene in real life, determining a level line to the horizon can sometimes be difficult, particularly if there is an abundance of buildings all around us.  Sometimes it is easier to look at where most of the rooflines are pointing – the convergence of such lines will often supply the required Vanishing Point ( often referred to as the ‘VP’ ).   Here are two watercolours by Paul Talbot-Greaves.  I have copied these with his permission together with his comments on the perspective of his pictures
This first image is at Stickle Tarn in the English Lake District. Paul writes  ‘The painting does not contain any buildings and yet we feel as if we are up high.  The eye level here crosses the picture near the top of the left hand rocks and the illusion of height is gained by the downward slopes of the rock walls. Reinforcing the high viewpoint is the water of the tarn painted way down below this imaginary line. Because the brain associates this with ‘ground level’ we assume the position of a higher viewpoint
WHY are we getting the impression of looking DOWNWARDS here ?
And WHY do we feel we are looking UPWARDS here ?
The second image is at Hepworth, near Holmfirth, in the Pennines. Paul writes ‘In this painting the eye level is situated just over a quarter of the way up the picture with the buildings situated mainly above it. The lines of the stonework, roofs and doors all slope downwards towards the eye level in accordance with the rules of perspective. From this view we assume the position of looking uphill’
So now we come to the little matter of understanding how lines of perspective work. Quite simply, they join points that we know to be at the same level above ground, but which, because the surface we are looking at is at an angle to where we stand or sit, appear to slope down ( or sometimes up ) to the distance. Easier to demonstrate than to write ! First we will look at one point perspective. Here all the edges slope to a single point. This can relate to a single line of buildings in front of us as in this example :
Here we have a Somerset country house where our position is at an angle to the walls and roof.  The vanishing point (VP) is off screen to the left.  In this case you might need a longer ruler and a second piece of paper to mark the VP. Just a hint, here, If you are trying to determine lines of perspective on a photograph, use a piece of tracing paper to draw your lines so that you don’t ruin your reference.
The position of a Vanishing point is critical to the whole matter of linear perspective.   The VP for horizontal structures lies at the same level as the viewer’s eye Looking at photographs, it is often much easier to plot the Vanishing Point or points.  Let us look at two examples.
From this photo taken in a chateau in the Loire valley, we can see clearly how the lines of tiles, the lines along the edges of the floor and the lines along the edges of the ceiling all go towards a single point which falls around the centre of the end wall, at eye level We can also note how most of the heads line up and the feet are at different heights. Any variation in head heights is mainly down to the fact that the people on the right hand side are sitting down. We will come back to this picture later when we look at how we can accurately draw such things as a set of black and white (or any other colour) tiles, where the pattern is set at angles to our line of vision.
Here we have a scene in St Gustain in Southern Brittany, a quaint little port which is a favourite with tourists. Here our position is on the quay looking up into the old town. Vanishing point is at the top of the lane at ground level as we are lower than the buildings.  Some of the buildings are set higher up the lane  and provided that the frontages of the buildings are parallel  they will share a VP .. In this case most  of the buildings on the left have a VP off the picture to the right.  The lane curves and the end building on the left has a different VP. Modern buildings and straight streets tend to observe accurate  lines whilst old buildings and curved streets (which are much more scenic) tend to give us more perspective problems. In the second part of this topic I will look at Gold Hill where we are looking down a familiar street scene and there are a whole range of Vanishing Points as the street curves and descends
If we look at a structure head on, there will not usually be any perspective in the shape.  Here we have a simple block. The block is in front so we see the simple shape of the square end. If we assume eye level to be at the centre point we can work out what the right hand side will look like and also the shadow – which will obey exactly the same rules.   All the perspective lines meet at eye level. This is ONE POINT PERSPECTIVE.  
The interesting work comes when we see buildings ‘corner on’ – this is when two or more vanishing points arise. Let us look at our block again.   These are examples of TWO POINT PERSPECTIVE
Here we see two edges receding away from us. Both VPs and the shadow line lie on the same eye level line as before.  Note that the closer the VPs are to the structure, the higher will appear the block. Here the front lower edge of the block lies below us and the block appears to be lower as a result
Here on the  right, we see an example of a street scene drawn out Note the eye level determines the height of the door at the front of the shop which assumes head height. Here the eye level is lower than the block example above and as a result the building appears higher If we put eye level at ground level and the vanishing points more distantly placed, the block appears to be further away
If we position the eye level higher up we assume a higher viewpoint ( Thanks to Paul Talbot-Greaves for the block illustrations )
In the slightly more complicated world of TWO POINT PERSPECTIVE, we now need to consider how it relates to scenes in real life. Here, roads don’t always go straight, buildings are built at different times and sometimes at different angles to the road. We can get eye levels and vanishing points all over the place.  This doesn’t mean we can ignore the rules of perspective…. we just have to be more careful how we show the surfaces in front of us.
This is an Italian street scene. We have two separate sets of buildings, a slope in the road and walls that are not vertical.  It is still possible to calculate the lines to be followed to get a good representation of the effect of distance on the walls and windows. It is more than possible that these two facing lines of buildings are not parallel to each other - the road seems to be gettig narrower.  This leads to us having two separate lines of perspective and two vanishing points Nearer home,  we look at another problem picture at Gold Hill, Shaftsbury, Wiltshire.
This is the famous scene where the Hovis bread advert of many years ago was filmed with the the boy cycling down the hill to deliver a loaf of bread.   I have included this photo taken in snow and at night – just because it looks so inviting!    First, let us look at the more usual image of this (below) and how perspective works on a downward curving road.   In the lower photo, I have shown the perspective of the nearest buildings on the left (yellow).  The perspective of the next pair of buildings on the left (light blue) where the VP is off the page,  and the lines for the set of posts on the right (red).   If you try to draw all your VPs in, you will not be able to see your original picture for lines ! Let us look at how eye level in the picture affects how we make assumptions about our position. When we paint a picture of a scene direct from ‘nature’ we have to decide where our eye level is going to be in the picture and ensure that any lines of perspective in nearby buildings relate to vanishing points at that level. Look at the lines on the Gold Hill example. The VPs for the buildings – certainly those nearest the viewer, all rest on a line somewhere close to the sky.  We can ignore the VP of the posts on the right as they follow the slope of the road downwards Perspectives are much easier when they only relate to single surfaces all pointing the same way and at the same angle !
One other image to get your head around.   This works the other way  and is a Venetian cloister. Many of your VPs  will finish up on the outside of the picture – or close to the edges. This is perfectly normal. It may just mean that you need to add a scrap of paper to your drawing board ( or even the far side of your desk ! ) to fix the position of the VP whilst you do the framework of your picture Look at those curved arches. Now that is another problem. The spaces get narrower as they become more distant. How do you calculate how much narrower to make them? This is similar to the problem of a fence and the need to know the way the apparent spaces between the posts change as the fence recedes into the distance.  We will look at this later. Look at this picture on the right and see where you think the lines of linear perspective will run and where the vanishing point will be. Bear in mind there is a slight curve to the building line, but if you ignore that, you should still be in the right area
WE WILL NOW HAVE A QUICK LOOK AT BRIDGES AND ARCHES Looking at the bridge, see how that arch shape changes as we move around.  Our view point changes and so do shapes like circles and arches.  How do we draw these ?   What about the tops of glasses and other circular things?. How do we draw tiles and arches receding into the distance? Let us consider circles first.  To draw a circle we should first draw a square to contain the circle. See the drawings below:
WE WILL NOW HAVE A QUICK LOOK AT BRIDGES AND ARCHES Looking at the bridge, see how that arch shape changes as we move around.  Our view point changes and so do shapes like circles and arches.  How do we draw these ?   What about the tops of glasses and other circular things?. How do we draw tiles and arches receding into the distance? Let us consider circles first.  To draw a circle we should first draw a square to contain the circle. See the drawings below:
Once we have the technique of drawing the circle within the square, we can distort the square to obey the laws of perspective and then draw our circle within it. This will give us the essential basic shape to enable us to draw arches in perspective:
The further round the arch comes, the flatter the circle. This method helps in drawing things like railway viaducts as seen above:  The near arches are more circular, the far ones more pointed
You may have noticed that as the arches get further away, the gaps between the stonework get narrower and narrower.  This is also a problem for drawing a series of fence posts or the pillars to a church cloister. We need a way of drawing these spaces so that the distances are accurate.
There is a simple method for finding the correct spacing.   First draw three lines to the VP giving the horizontal guides for the top, bottom and middle. Draw your first upright and then the second. Put in a cross in the first space and then copy the exact angle of the upright line in the second space. This gives you the horizontal distance to the third post and the cross will give you the bottom position.  See the diagram on the right You can then repeat the method across your drawing, and you will find each space is smaller than the one before and correct in perspective. This gives you correctly spaced posts at the correct height
Our final exercise is to look at tiles on a floor This is not the only method of drawing tiles in perspective, but It does work for me ! Tiles are a tricky one, but bear with me and I will go through the process gently …. Draw your first square in correct proportion. In my first example shown here, below, it is the bottom left tile.  Identify the vanishing point you require, and then you can put in your ‘verticals’ to show the lines of tiles going away from you.   Then put in a diagonal line to the far side of the floor . This will usually be a projection of the original shape of the first tile you drew. At each point where our diagonal line crosses a vertical, we need a cross line to give us our horizontals. Hey Presto ! we have a set of tiles in perspective.
If your construction of lines is all drawn in accurately and lightly on the paper, you can then go over the top with a stronger line and refine the drawing as a set of tiles.  All other bits of lines can then be erased.
But what happened if our tiles are being viewed on the diagonal ?  OK, that is a complication , but not impossible to solve.  You will need to use two point perspective to draw the tiles and a true vertical line to help with the spacing of the tiles to give distance with flatter, smaller tiles at the back and larger, more upright ones at the front. May I say at the outset that you need to be VERY careful over your measurements and your accurate drawing. I wasn’t as careful as I could have been, and as a result the tiles failed to keep exactly to shape and position. The purpose of this tutorial is to show you the technique … and that is my excuse !!!!
But what happened if our tiles are being viewed on the diagonal ?  OK, that is a complication , but not impossible to solve.  You will need to use two point perspective to draw the tiles and a true vertical line to help with the spacing of the tiles to give distance with flatter, smaller tiles at the back and larger, more upright ones at the front. May I say at the outset that you need to be VERY careful over your measurements and your accurate drawing. I wasn’t as careful as I could have been, and as a result the tiles failed to keep exactly to shape and position. The purpose of this tutorial is to show you the technique … and that is my excuse !!!! Image 2  sees the addition of two perspective lines that define the front tile.  Make sure the lines cross on the vertical guide line……… ( see left) ( If you wander off and your line moves away from that central line, your drawing will get increasingly inaccurate ) Image 3   Put down a marker horizontal, level with where the previous pair of perspective lines crossed the middle (see left ) Image 4      and connect up to the VPs ( making sure that these lines also cross at the centre). Then put down a further pair of outer markers level with where the last perspective lines crossed and connect those up.  I found it helped to make a single mark on one side and draw the crossing line with reference to the centre. You should then be able to build up your tiling to completion. Image 5  Now remove unnecessary marks and you have your tiles              (see below)
OBVIOUSLY this is a long way from being a comprehensive review of perspective. There are places I suggest you go to see more information and by the time you have read the scripts from a few writers, you may start to get the idea more clearly. YouTube is a great help in making things clear.   http://www.draw23.com/perspective   has some good explanations and a YouTube video There are also good Video examples on YouTube at : http://www.youtube.com/watch?v=felys- u4nfk       and http://www.youtube.com/watch?v=KeOnO MZXkno&feature=fvwrel    which has some nice music as well And if you would like a very detailed explanation with one, two and three point perspective explained,  have a look at : http://www.khulsey.com/perspective- drawing-basics.html
NOTE All these suggested links worked when I wrote the topic. I have no control over disappearing links since that date
Bob Voyage in your journey through the joys of perspective