Rob Adams a Painter's Blog painter's progress

February 17, 2017

How to Cheat at Perspective pt1

Filed under: Drawing,How to do,Perspective,Uncategorized — Tags: , , — Rob Adams @ 3:43 pm

This post and the forthcoming ones are for anyone who has had perspective explained to them, but found that their brain started to close down causing them to feel an irresistible urge to get as far away from the person explaining as possible and have a quiet coffee and read OK magazine because it is certain there will be no article on perspective in it. Every now and again I am in the position of the abandoned explainee when I have to explain some of the finer points of perspective to a fellow painter. It starts off fine when I say, “Hold up your brush as close as you can and as level as you can, right in front of your eyes.” They do this and I pronounce. “You see where it cuts across your vision, that is always the Horizon line.” Over the years I have mastered the skill of saying horizon with a capital ‘H’.

They mostly just accept this, but some say, “What about if you are up a mountain, won’t it be lower?”

Fixing an irritatingly patronising smirk on my features I reply,”No, if you hold up your brush when you are on the very top of mount Everest it will still mark the horizon.”

“What about in space?” The smart-arses come back.

My smirk slightly morphs into a pout at this point…”When exactly are you going to paint in space…?” I enquire.

“So it doesn’t always work! What is the use of that then?”

So there we are, the rules of perspective are rules that don’t always look right on the page when you follow them. In actuality, as I have written in other posts, the whole business of linear perspective is a crude approximation of what and how we actually see. It is convenient I suppose that one point perspective is fairly easy to explain, with railway tracks meeting at the horizon etc. However once you are in the territory of 2 and 3 point perspective and quite wide angles of view your explanations gain an ever increasing degree of complexity which are going to glaze over most painter’s eyes. Also linear perspective assumes you only have one eye and a flat retina. Also it is taken for granted that neither your head or your peepers can swivel. I don’t know about you, but when I paint something I do a fair amount of swivelling and general rubbernecking!

Many artists avoid the whole thing by never doing town or cityscapes at all, or if they do they look way off into the distance which is where linear flattens out into cardboard cutouts. Most of us who don’t avoid such subjects stick to the safe territory of one point perspective and a tight view. Where it all falls apart though is when we take that slightly wider view.

Time for one of those diagrams, but don’t click away, there will be no equations or hyperbolic geometry.

Perspective drawing

Here we are in a town with mostly one point perspective, there are only a few bits of sticky-out shop and rooflines that don’t recede from us. The rest tapers off to meet at the point on the horizon in the middle of the street. I’ve gone quite wide too and all seems well. I have cheated a bit though. If I had stuck to the constructed rules of perspective the shop on the far right would be sort of stretched out; indeed in a photo that is just what happens. So a skinny man standing in the middle of a photograph will look like a fat man if he goes to the far side of the frame. We are so used to this effect in photos we no longer notice the distortion. Just for fun below is an image where those perspective rules that you have never quite understood start falling apart.

perspective drawing

The wide-angleness of this image is not far off a point and click camera or your phone. As you see we have a straight row of perfectly identical computer generated men. Well call me picky, but to my eye the chap on the far right has had a few more iced buns in the last month than his friend in the middle… but they are identical models just duplicated, the distortion is purely caused by using the rules of linear perspective. To make it worse the chap on the right is about twice as far away from you the as chap in the middle… now I always thought the “rules” said things got smaller as they got further away. The blimps in the sky, by the way,  are all perfect spheres… it is a property of spheres that they always have a circular outline wherever they are in your field of view. These appear to break that rule with enthusiasm. To recap, if you got a set of bald grey elevenplets (rarer that triplets I hear) and stood them in a line in front of your point and snap this is how they would look in your photo.

perspective drawing

Here we are back in our city. We have stepped back a bit and widened the view. This is version one. At first glance this looks sort of OK. However the building on the far left has a corner that should be closer to you than the point at which it leaves the picture on the left of the frame. Yet following the rules of linear perspective it causes that face of the building to get taller as it gets more distant. The very opposite of what our eyes see in reality. Below is my guestimate fix.

perspective drawing

Take a moment to compare versions one and two. I have made two simple adjustments one quite obvious, one less so. Firstly can you see that this looks more likely than the first version? If not can I suggest a quick coffee and a copy of OK? Ahem… the big change is on the left. The vanishing point has flipped from right to left so the building goes away from you as it should, you might also notice that the chimney stacks and the zebra crossing make more sense and the corner feels properly square. The other change is to the shop corner to the right of the picture. I have slightly curved and flattened the angle of the perspective as the lines reach the square corner. This helps the building on the left fit in better, though beware if you over do it things start to look bendy!

Linear perspective is fine as a starting point, but you do have to make subtle corrections to make up for its considerable deficiencies. Essentially you need to make some straight lines a bit bendy in order to get things to make better sense. My own take is to not over do it and get into fisheye territory, but to do the least possible to reduce any inconsistencies. I do get asked, “How can straight lines be bendy?” they will often hold their ruler against the offending roofline and go, “See it’s straight.” Instead of telling them the unwelcome fact that they are seeing their ruler bendy too, I usually suggest a coffee…

I am doing these little tutorials in small bites to make them a bit more digestible. If people have perspective questions post them below and I will try and cover them in future posts.

September 11, 2016

Measuring

Filed under: Dorset,Drawing,How to do,Painting,Uncategorized — Tags: , , , , , , , , , , — Rob Adams @ 1:10 pm

I often see artists vaguely waving their brush at arm’s length when painting and measuring by sliding their thumb down the handle. It looks very good to passers by and perhaps makes a marginal improvement the proportions in their painting. However the picky pedantic bit of me notes that they have not dropped their head onto the shoulder of their outstretched arm or closed one eye. This means they have never learnt how to do measuring and the distances they are checking will be pretty inaccurate.

The very first thing about measuring is what and when should you measure? If it is a bunch of trees or other shrubbery then do we care if a painting has accurate shrubbery in it? You never hear people say, “That’s a pretty good painting, but a pity the clump of rhododendrons is out of proportion…”. So when it comes to hills, mountains, trees and general greenery I just use the diagonal method which is estimating the box the target will fit within and then finding the angle from corner to corner as below.

illustration

Once you have that angle you can scale it any way you wish.

Something that might need a little more accuracy is how the verticals of buildings fit across your picture. For this I use a version of the sight size method. If you hold up your painting board so that it exactly covers the area of your proposed masterpiece, then without moving it nearer or further away slide the whole board downwards  or upwards and you will be able to mark where the verticals divide the picture along the top or bottom of the board. The same can be done with horizontals if you slide the board sideways. I usually only knock in the top and bottom of the box that encloses the structure rather than any internal lines which are usually effected by perspective in any case.

Here is my board covering the composition I want.

Slide up and mark key points.

Once you have those then join up the dots. I am not aiming for perfect accuracy only reasonably correct proportion.

Taking angles, which I have already mentioned, deserves a little more attention. It is not always straight forward to transfer an angle from a brush held against the subject to your canvas. Firstly it is not a bad idea to mark a toe line, just scratch a mark on the ground to set where you will place your feet when you make any measurements. Next, when measuring make your canvas vertical and as near eye level as you can. Transferring an angle to a sloping board is not impossible but much harder! Remember, drop that head to the shoulder to get your eye as near to the line of your fully stretched out arm as possible.

I frequently use angles as a quick check against distance measures, make a box around the bit you want to check the proportion of and if they don’t match then rechecking is required.

If you are doing a really complex scene think about using a thread frame, it looks seriously uncool and everyone will mutter cheat, but it is really no different than measuring piece by piece. You need to hold up the frame so that the right number of squares covers your subject. A trick is to note a left and right feature in your scene so you can reposition the frame easily, or you can even better set it up on a stand. Either way you will need to mark your toeline so you keep your position consistent. Some even go so far as to set an eye point which can just be a pole stuck into the ground coming up to an eye level point.

My thread frame is a very basic 14in by 10in with the threads at inch intervals. I have a larger one with 2 inch threads which I use in the studio, so if I am painting from a reference or sketch I can grid it up and transfer the drawing. Again people feel this is somehow cheating but Durer, Rubens, Rembrandt and Michelangelo all used this method and everyone knows that they are rubbish! One thing you will find is that after a while you develop a sort of internal grid and so need the real thing less and less.

I have managed to print off a few of my linocuts with my new press. So much easier than a barren and wooden spoon!

 

linocut. print, child okeford, dorset

This is my local the Baker Arms in Child Okeford. Just two plates.

 

Kington Magna, linocut, dorset

This is a slightly more stylised one of the church at Kington Magna. The way the lino cuts really lends itself to this sort of treatment. I pushed the boat out with 3 plates on this one. I also did a much more worked out preparatory drawing.

 

Kington Magna, church, linocut, relief print

My new press allows me to print on paper that would be very laborious with a barren. I wanted to use the black key plate and try and get a very different feel with the same image. I added the white by hand, but I could have cut a white block.  Next I am attempting an MDF cut!

 

This is a version of my more monochrome tonal sketch of Dorchester I posted previously. I wanted a more up beat feel. Oil, 16in by 12in.

 

Pinacles, Old Harry, Dorset, Cliffs, oil painting, sea

I went down to the coast to draw Old Harry rocks. By the time I finished drawing the light was almost gone but I couldn’t resist a try at this nearby sea stack. The light went over so quickly I only got a very basic block out done, so this is much more studio than plein air. I ended up making it quite different from both the block in and the photos I took, so this is how it felt in my memory rather than how it actually was! 12in by 12in oils.

 

Old Harry, Poole, Sea stacks, cliffs, sea, pen and ink, drawing, dorset

Here is Old Harry rocks. Sitting with my feet almost dangling over the edge here! As I drew the sun came through and lit the chalk cliffs very dramatically, but I felt it looked better a bit before the sun reached its flu strength. Pen and Ink.

I have a one man show at The Gallery on the Square in Poundbury it rune until the 18th of October 2016.

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