Thread color conversion: matching embroidery thread colors between brands

Every embroidery thread brand has its own palette and its own numbering, and none of them line up exactly. When a design's color chart lists a brand you do not stock, or a client hands you a logo color to match, you are converting: choosing the nearest thread in your own line. Conversion charts and software make that fast, but every conversion is an approximation, and the only reliable final check is real thread, stitched.

Why thread colors do not convert exactly

• Each brand dyes its own palette. Thread makers choose their shades independently. Brand A's mid red may sit between two of brand B's reds, so the "match" is whichever is closer.
• Numbers are unrelated. A color number is a catalog code, not a color definition. The same number in two brands can be completely different colors.
• Fiber changes the look. Rayon, polyester and cotton take dye differently and reflect light differently. Even an identical dye looks brighter on a glossy fiber and softer on cotton. Polyester vs rayon thread covers the difference in sheen.
• Light changes the match. Two threads that match under shop lighting can part ways in daylight, because different dyes reflect the spectrum differently.
• Dye lots vary a little. A new spool of the same number can differ slightly from an old one, which matters when you are matching an existing piece.
• Screens and print are not thread. Software swatches, machine screens and printed charts are all stand-ins. They are good for telling colors apart, not for deciding whether two match.

Where conversion charts and automatic matching come from

Many thread makers publish cross-reference charts from popular competing lines to their own. These are made by comparing threads, and they are the best starting point you have, but they still pick the nearest shade, and different charts sometimes disagree.

Embroidery software converts by storing a screen color value for each thread in each brand's palette and picking the nearest value in the palette you choose. That is only as good as the stored values, which are themselves approximations of physical thread. Use automatic matching to get close quickly, then check every color that matters by eye. For backgrounds and small accents the software pick is often fine. For skin tones, logos and colors that sit next to each other in a gradient, it often is not.

Use a physical color card

A color card with real thread samples (most thread makers sell them for their lines) is the most useful conversion tool you can own. Use it this way:

• Compare in daylight or a daylight-type lamp, and check again under the light the piece will be seen in, if you know it.
• Compare thread to thread, not thread to screen. If the design's original brand is not in your shop, a card for that brand lets you see what the designer chose.
• Keep the card closed and out of sunlight when not in use, so the samples do not fade.

What the design file says about color

How much color information you get depends on the format, which is why the same design can open in different colors on different machines. Embroidery file formats covers this in full.

Whatever the format, trust the design's printed color chart over the screen. When you convert a file between formats, colors are the part most likely to be lost; converting file formats shows how to restore them block by block. Changing the thread assigned to a color block is a safe edit in any stitch file, because it does not move a single stitch; see stitch vs object files.

Convert a design step by step

1. Get the designer's color list. Note the brand and number for each block, in stitching order.
2. Look up each color in a cross-reference chart for your brand, or let your software suggest the nearest thread.
3. Check each pick against a physical card, or the actual spools, in good light. Pay most attention to large areas, neighboring shades and anything the client cares about.
4. Stitch a sample for critical colors on the real fabric and stabilizer, with your normal setup.
5. Write the substitutions on the chart, and save them in the design if your software and format keep thread data. Next time the job runs, nobody has to redo the matching.

Matching logos and brand colors

Business clients often supply a print color reference rather than a thread number. Many thread makers publish references from common print color systems to their threads, and that is a sensible starting point. A print color and a thread will never match perfectly, because ink on paper and dyed fiber reflect light differently. Stitch the logo in your chosen threads, show the client the stitched sample rather than a screen preview, and get approval before a production run.

Keep conversion to a minimum

The less you convert, the fewer surprises you get. Standardize on one main thread line where you can, and set your software's default palette to that line so new designs and conversions start from threads you own. Buy designs whose charts list your brand when the choice is offered. For the wider question of which fiber and line to stock, see embroidery thread types. If a converted thread from a different line also runs differently in the machine, with more breaks or a shift in tension, treat that as a setup question and run the Stitch-Out Tuning Method with the new thread.