There are two ways to make your own color by number: trace and simplify an image by hand, or let software reduce it to a limited palette and trace the edges for you. The hand method gives you far more control over what the finished thing looks like. The software method is quicker and better suited to photographs.
Both start in the same place, and it is the step people skip: choosing a picture that will actually convert.
Pick the right picture
A color by number is a picture reduced to flat areas of a single color with a hard boundary between them. Anything in your source image that depends on gradual shading has to become a hard edge somewhere, and you are the one who decides where.
Images that convert well have clear shapes, obvious light and dark separation, and a subject that stands apart from its background. Simple illustrations, bold graphic images, a flower against a plain surface, a building, a single animal.
Images that fight you: soft-focus photographs, anything backlit, busy patterned backgrounds, and misty or low-contrast scenes where everything sits in the same narrow band of tone.
The quick test is to look at your picture in black and white. If you can still read the subject with no color at all, it will convert. If it turns to mush, no amount of tracing will save it.
Method one: by hand
This takes an evening and needs almost nothing: tracing paper, a pencil, a fine black pen, and something to color with.
1. Get the image to final size. Print it, or draw it, at the size you want to color. Everything downstream depends on this, because the size determines how small your smallest area can be.
2. Trace the boundaries, not the drawing. Tape tracing paper over the image and outline only the places where the color genuinely changes. This is the whole skill. You are not copying the picture — you are finding the borders between one flat color and the next. A shadow across a wall is a boundary. A slight variation in the same brick is not.
3. Simplify as you go. Any area smaller than the tip of your pencil should be absorbed into its neighbor. Fiddly little shapes look like detail while you are drawing them and like dirt once they are colored.
4. Choose your palette before you number anything. Lay your pencils or paints out and pick the ones you will actually use. Eight to sixteen colors is the useful range — enough for the picture to have depth, few enough to keep the numbering manageable.
5. Number every area. One number per color, used consistently across the whole design. Write the number small, in pencil, near the middle of each area rather than at the edge where the coloring will swallow it.
6. Make a legend and swatch it. Draw a box for each number and color it in with the actual pencil or paint. Writing "3 = blue" is close to useless when there are three blues. Seeing the color is what makes the sheet usable.
7. Transfer it. If you want to color on better paper than tracing paper, rub soft pencil over the back of your tracing, lay it face up on the good sheet, and go over the lines with a hard pencil. Graphite transfer paper does the same job more cleanly. Then ink the lines in fine black pen so they survive being colored over.
Method two: with software
Photo editors and dedicated tools do the same work differently. The operation you want is posterize, which reduces an image to a set number of flat tones — set it to the number of colors you want and the software makes the decisions about where the boundaries fall. From there you trace the resulting edges, either with the software's own outline function or over a printout.
It is faster, and on photographs it is genuinely better than doing it by eye. What it is not good at is judgment. Software will happily produce four hundred tiny regions from a patch of grass, and you still have to go in and merge them.
Our guides to paint by numbers software and converting a photo for free go through the specific tools and what each one produces.
How many colors
Fewer than you think. Every color you add multiplies the work — more boundaries to draw, more numbers to write, more decisions while coloring — and past a certain point the extra shades are indistinguishable in the finished piece.
Eight colors makes a bold, graphic result. Twelve to sixteen gives you enough range for shading and depth. Beyond about twenty you are making work for yourself, and the areas get small enough to be tiring rather than relaxing.
One tip worth knowing: include a genuine dark and a genuine light. A palette of six mid-tones looks flat no matter how carefully it is drawn. The contrast is what makes the picture read.
Coloring it in
What you use changes the approach.
Colored pencils want light, repeated layers rather than one hard pass. Pressing hard flattens the paper and makes it impossible to correct. Work in one direction within each area so it looks even.
Markers want speed. Work each area in one go before the edge dries, or you get a visible line where two passes met. Test on a scrap first for bleed-through.
Paint wants the darkest colors first and the lightest last. Dark paint covers a printed number in one coat, pale colors often need two, and light paint straying into a dark area is easy to cover later.
Whichever you use, do the largest areas first. It builds momentum, and it means you are not resting your hand across finished work.
Where it usually goes wrong
- Too many areas. The most common failure, and the one that turns a pleasant project into a chore. Merge aggressively while tracing.
- Areas too small to color. If your pencil tip does not fit in it, neither will the color.
- A legend written in words. Swatch it. Always.
- Numbers written on a boundary. They vanish the moment either side is colored.
- Inconsistent numbering. Decide that 4 is that particular green at the start and keep it that way to the end.
If you would rather one was made for you
Making your own is genuinely satisfying, and it is also a lot of work for one picture. If what you actually want is a canvas rather than a craft project, a custom paint by numbers made from your photo does the conversion, prints it on primed canvas and mixes a paint set to match — at 12 x 16, 16 x 20 or 18 x 24.
Or, if you would rather skip the picking as well, our licensed designs are landscapes, wildlife, cabins and florals, each printed and matched to its own paint set. Either way, the tracing evening is optional.
