Value and contrast: why your star points disappear

Quick answer Value is how light or dark a fabric is, ignoring its colour. Where two fabrics with the same value meet, the edge between them disappears, and so does the shape they make. Check value with a black-and-white photo before you cut, and make sure the fabrics that touch in your blocks are clearly different.

You chose a gorgeous coral for the star points and a soft peach for the background. Together on the bolt they looked lovely. In the finished quilt, the stars are gone.

That's a value problem, not a colour problem. It's the most common reason a quilt doesn't look like the pattern photo, and it's easy to check before you cut a single piece.

What value means

Every colour has three qualities: its hue (red, blue, green), its saturation (how bright or greyed it is), and its value, how light or dark it is. Value is the one your eye uses to find edges and shapes.

A pale blue and a pale yellow can have exactly the same value; so can a navy and a deep burgundy. When two fabrics with the same value sit next to each other, the eye can't find the edge between them, and the shape they make melts away.

Value makes the pattern

Log cabin quilts show this best. Each block is light on one side and dark on the other, split along the diagonal. Turn the blocks, and the light and dark halves join up across the quilt into big diamonds: the barn raising. The colours hardly matter. Swap the rust for a navy and the diamonds are still there, because the values are the same.

Colour

Value only

The same goes for every classic block. A star needs points that are darker or lighter than the background. An Irish chain needs a chain that stands out from the background around it. A churn dash needs the bars to contrast with the centre.

How to check value

• Take a black-and-white photo. Lay your fabrics side by side, overlapping a little, and photograph them in your phone's mono or noir mode. Fabrics that come out the same grey have the same value.
• Squint. Colour fades before value does, so squinting at a pile of fabric shows you its values.
• Use a value viewer. A red or green piece of clear plastic hides colour. Red viewers don't work on red fabrics and green viewers don't work on green ones.
• Step back. Look at your fabrics from across the room. Up close you see print and colour; from a distance you see value.

Sort your fabrics into light, medium and dark piles. Most quilts need at least two of the three, and many need all three.

Where contrast matters most

Contrast matters where two fabrics meet: star points against the background, the chain against the background in an Irish chain, the logs on either side of a log cabin's diagonal. Fabrics that never touch can be as similar as you like.

So don't judge contrast by laying all your fabrics in a row. Look at them in pairs, the pairs that will actually be sewn together, and check each pair.

Prints count too

A busy print reads as a medium value even if it has light and dark in it, and it blurs the edges of the pieces cut from it. Some tips:

• Small, tone-on-tone prints behave almost like solids. They're safest where you need a crisp shape.
• Large, multicoloured prints are best in big pieces: a border, the centre of a block, or plain squares.
• Low-volume prints (white or cream backgrounds with small, light motifs) make a background with texture that still reads as light.

Low contrast on purpose

Low contrast isn't always wrong. Soft, blended quilts use it on purpose: a watercolour quilt where colours shade into each other, or a quiet quilt in creams and greys. The shapes still need some value difference to show; it's just smaller.

Just make it a choice, not a surprise.

Three ways to train your eye

Value gets easier with practice. These take ten minutes each and teach more than any colour wheel:

1. Sort your stash. Pull twenty fabrics and arrange them in a line from lightest to darkest. Photograph the line in black and white. Any fabric that's out of place in the photo is one your eye misjudged. Usually it's a bright one: saturated colours look darker than they are.
2. Make one block three ways. Sew the same block (a friendship star is quick) with a light star on dark, a dark star on light, and two mediums. Pin them up and step back. The two-medium block is the lesson.
3. Copy a quilt in grey. Find a quilt you love and look at a black-and-white photo of it. Notice where the strongest contrast is: that's what the maker wanted you to see first.

How Quiltkind helps

The studio's black-and-white view shows your whole quilt in grey with one tap, using photos of your real fabric. And the contrast check looks at every place two fabrics touch in your design and warns you when they're too close in value, for example "Peach and Coral are close in value where they meet in Sawtooth star". You'll know before you cut a single piece. Plan a quilt with no contrast warnings and you'll earn the Sharp eye badge.

Common mistakes

• Choosing fabrics on the bolt. Bolts stand side by side in a shop; your pieces will be cut small and sewn edge to edge. Check them as pairs.
• All mediums. A quilt of all medium values can look flat, even in bright colours. Add some lights and darks.
• Trusting colour names. "Navy" and "burgundy" sound different. In grey, they can be twins.
• Busy background. A background with a strong print fights the blocks. Choose a calm one, or a low-volume print.
• Checking under one light. Evening light flattens values. Check in daylight, or with a photo.

Frequently asked questions

What is value in quilting?

How light or dark a fabric is, separate from its colour. It's what lets your eye see the shapes in a quilt, which is why it matters more than colour for whether a pattern shows.

How do you check fabric value?

Photograph the fabrics together in black and white on your phone. Fabrics that turn the same grey have the same value. Squinting at them works too.

Does contrast matter between all the fabrics in a quilt?

No, only between fabrics that touch. Two fabrics that never meet in the quilt can have the same value without any problem.

What is a low-volume fabric?

A print with a light background and small, light motifs, often in white, cream or pale grey. Low-volume prints make a background with texture that still reads as light.

Can a quilt have too much contrast?

Yes, if every fabric jumps out at once there's nowhere for the eye to rest. Most quilts look best with one strong contrast that carries the pattern, and quieter differences everywhere else.