Time is precious and sometimes you need a quick and easy way to scale up a drawing. This post will guide you through 4 practical ways to enlarge (or reduce) your image.
These are the methods I use, or have used, to scale a drawing:
- Grid your reference, enlarge or decrease the ratio when drawing the grid on your paper,
- Measure two points with scale dividers, the reverse end will mark the same points on a different scale.
- Enlarge a photocopy to size, shade the reverse side, flip it over and trace the outline.
- Project the image onto a wall or canvas and trace the outline.
No fluff, let’s jump right in.
(I get commissions for purchases made through links in this post. However, I only promote products I like and recommend)
How to Scale Up Your Drawing Using a Grid
The idea is very simple. You grid your reference, draw another grid on your drawing paper, and copy each box.
Accuracy is everything with this method. Your grid must be spot on or things will go wrong. Drawing an accurate grid is more difficult than it looks.
Make a few photocopies of your reference photo. Now try to measure out the grid using a ruler. For argument’s sake, let’s say you are marking out a 1-inch grid (25mm).
A pencil dot every inch, what could be more basic? True, but it’s seldom accurate.
Most folks miss their mark and that has a knock-on effect.
You should use the width of the ruler to draw parallel lines along both edges. It’s more accurate than measuring each dot and drawing single lines. If the boxes are too large, draw diagonals within the boxes, it’s quicker and more accurate than marking out the halfway point between two dots.
If you have a technical drawing board it will be easier to get things right. Use low-tack framers tape to secure your paper. You don’t want to tear the edges of your paper.
Use the slider to place your horizontal lines and a CLEAN set-square to line up the verticals.
What a PHAFF.
Try this instead, grid a digital file. You’ll need a photo editor. If you know your way around simple photo-editing then download the grids below and layer them onto your image.
This course is a bestseller on Skillshare: (affiliate)
You can use a free tool called Pixlr.com (affiliate) and follow these instructions.
The free online tools are great but you must put up with ads. The Premium version (affiliate) has all the bells and whistles you could need and it’s about $65 per year at the time of writing. It’s ad’ free and downloadable.
This is your landing page. there is no need to sign up and login. Click the ‘open image’ button.
Your chosen file image will appear in the photo editor. Now click the plus icon at the bottom right (+).
This dialog box will pop up. Click the image box. Find your grid file and open it into the editor.
The grid will be a new layer and appear on top of your original image. The arrows point to both layers in the sidebar. You can adjust the top layer if you wish.
If you click the cross icon in the top left corner you will be able to move the grid up and down. Move the pointer over the grid and left-click the mouse (and hold it down) to reposition the grid. You can enlarge or reduce the grid by dragging the blue corners diagonally.
When you are happy as it is, flatten the image. This locks the layers together into one image.
Download your file with a perfect grid. You will never draw a more accurate grid and it will only take you a few minutes.
You can draw a larger grid on your paper and work from the gridded file from your computer screen. I hate doing this.
If you have a printer, enlarge several copies to various sizes and print them off. Choose the copy size you’d be comfortable drawing and use that scale to draw it out, 1:1. Far easier.
If you don’t have a printer (and I don’t) get an instant photo printed and photocopy it, again in several sizes. I nip into my local library and do it there.
N.B. If you are going to print a photo make sure you have a large file so it doesn’t pixelate.
If you lay your gridded photocopy onto your drawing surface you can mark the lines accurately by using the copy as your ruler.
Draw the grid very lightly over your drawing paper. You want to avoid heavy lines that won’t fully erase and you certainly do not want to leave scorelines. Sounds obvious but it’s so easy to overlook.
I’ve drawn whole backgrounds in a drawing just because I was too heavy-handed and needed to disguise the grid lines I couldn’t remove! Be warned.
How to Scale Up Your Drawing Using Dividers
If gridlines are not for you and you want to retain more of the sketchy style and feel, scale dividers will help.
Put simply, dividers are two pointed bars joined together by a pivoted slider or peg holes. The artist measures two fixed points on their reference with one end of the dividers and, using the other end, marks out the corresponding points on their paper. The new scale will be true and accurate with every subsequent measurement.
If you need some extra help read this: How to Plan and Compose Your Art: A Guide for Beginners
The great advantage of using proportional dividers (affiliate), in my opinion, is how they allow you to retain the feel of freehand movement in your sketch. Using a grid is so precise it’s easy to lose any sense of spontaneity.
Dividers allow you to pinpoint the key features of your subject, such as the distances between the eyes, tip of the nose, and lips, etc, and mark them down with certainty.
So how do you set the correct scale? It’s simple really. With a very light touch, you sketch out the basic shape you want the drawing to be. For example, if you are drawing a portrait, draw an oval that feels comfortable for you. That’s the scale we are going to use.
Now measure the dimensions of the head on your reference with your dividers. Place the other end over your sketched oval. Where do the points touch?
Move your peg (or slider) up, or down, a notch until the proportions line up. One narrow end will measure the reference head and the other will be roughly the width/height of your oval. Voila
Now mark a spot somewhere in the center of your reference. This will be your measuring point. Everything will be measured out from this dot. You can measure the radials from this center point.
The distances will be accurate but if you’re not confident you’ll still miscalculate some of the angles. Let’s say you’re drawing the eyes. You may think they are on a horizontal line, in fact, the head might be slightly tilted and one pupil is lower than the other.
In that case, you will benefit from drawing one vertical and horizontal line centered on your spot. Now you can measure from both the center spot and the nearest line. Your true angles will be easier to see.
Good dividers are hard to find for a reasonable price. I bought a cheap wooden pair (above) and they are not accurate enough for me. I ordered a pair of cheap plastic Prospek dividers which looked much better online, but they were flimsy too.
Lastly, I ordered some brass dividers on Amazon (affiliate) and they are much better. Take a look yourself.
If you prefer video learning, check out this course on Skillshare (affiliate)
How to Scale Up Your Drawing Using a Photocopy
What if you are in an insane hurry? You have a deadline to meet and need to get the work done quickly, what then?
You can always trace a photocopy. I saw portrait artists in Thailand draw this way.
Enlarge a photocopy to the desired size and, using a soft grade of pencil, shade the back of the paper with a layer of graphite.
Flip it over and tape the top edge to your drawing paper using low-tack tape. Now, using a medium grade (HB), trace the key lines without pressing too hard.
You can lift the paper now and again to make sure the tracing is transferring properly and you have all the most important features marked out.
I discuss the right and wrongs of tracing here: Tracing Art – Is It Good or Bad? When Is Tracing Cheating and Is It Ever OK?
Some graphite will transfer with the weight of your hand pressing onto the copy so you may have to tidy the tracing with an eraser.
You now have all the proportions you need to crack on with the job.
Why not use a lightbox?
A lightbox, if you don’t already know, is an opaque screen backlit with a strong light. The artist tapes a preliminary sketch or photocopy onto the screen and tapes the drawing paper over the top. The artist then traces the outline.
I made own a lightbox many years ago, but it only worked well in a darkened room and was only good for tracing onto thin paper. It was expedient for drawing commercial work, where time mattered.
Modern lightboxes are much better than they were. There are plenty of lightboxes on Amazon (affiliate)
How to Scale Up Your Drawing Using a Projector
I also experimented with projectors many years ago. In those days there were three choices, slide, overhead, and opaque projectors. Now you have digital projectors that are far better.
I owned an opaque projector back in the ’80s and amazingly they are still manufactured and called Autographs.
They work by projecting a photograph, printout, or sketch, onto a vertical surface. You place the photo under the projector. A bright lightbulb shines the image onto a mirror, or prism, and bounces the light back through a lens, and projects it onto a wall or canvas.
There are major drawbacks.
- To get an image in proportion the projection must be at a fixed 90-degree angle or it will distort the image.
- The cheap models can get so hot the bulb can buckle paper or even melt a photo.
- They can only project from small images.
- They need a darkened room.
- They are expensive for what you get.
I can’t think of a good reason to use one. The same can be said for slide and overhead projectors. They are relics.
If you wish to project an image, buy a cheap LED digital projector (affiliate). You can pick them up for $80-$100 easily enough. They are small, don’t overheat, and are portable.
The LED bulbs are super bright and even the cheaper models exceed 2000 lumens; that’s blinding. They are so bright you can use them in daylight. No more darkened rooms. The more expensive models are perfect for muralists.
All you need is a digital file, a tripod, and a spirit level to align your image properly, and off you go. You can project the picture to your desired size and the tracing will only take minutes.
How to Scale Up a Drawing – Final Thoughts
Four easy ways to scale up a drawing. If you are drawing solely for pleasure with no commercial pressure I would recommend you use the proportional dividers. They will teach your brain to see in the right way. Eventually, you will use them less and less and see the proportions without a drawing aid.
If you are stuck for time, tracing is the quickest way to get something usable on paper.
If tracing is a step too far, use a grid. It’s laborious but you’ll get results.
I draw my work in public and use the grid method because I fear going wrong in front of an audience. It’s foolproof and perfect for photo-realism.
If you lack confidence you should take a class and get into the habit of drawing. I found this class on Skillshare (affiliate), 75436 students can’t be wrong!
These are my drawing tools if you’re curious: (Amazon affiliate links)
- Pentel Mechanical Pencils 0.3mm
- Derwent Graphic Drawing Pencils
- Daler-Rowney Heavyweight Cartridge Paper
- Jakar Battery Eraser
- Tombo Mono Eraser Pen
- Faber Castell Putty Eraser
- Blu Tack
- Brass Dividers
Fed up with Amazon? Try Arteza (affiliate)
You can scale up your drawings but how do you sell them? If you wanna live your dreams and make money with your art I can show you how!
If you found this article useful, you will like these related articles:
- Is Drawing From Photos Bad? Are You Cheating?
- How to Create Depth in Your Drawing and See it Improve
- Can Anyone Learn to Draw? 5 Great Tips to Get You Started
- What’s The Right Paper For Pencil Drawing? (How to Choose Wisely)
- How to Make Your Drawings Interesting: 14 Hacks to Add More OOMPH
- Can You Copy Art and Sell a Painting of a Painting? I Found Out
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