Your portfolio is finished. The layouts are tight, the type sits well, and the images look exactly as you imagined. Then you export for print and the deep orange you spent an afternoon mixing comes back as dull rust. Or you upload the printed version to your website and the whole piece looks flat, slightly green, and somehow cheaper than the file on your desk. Nothing is broken. You have just met the line where light becomes ink.

Two ways of making colour

RGB describes light. Your monitor, phone and projector mix red, green and blue light additively: full red plus full green plus full blue gives white. Because a screen emits light straight at your eye, it can produce very bright, very saturated colour.

CMYK describes ink on paper. A press lays down cyan, magenta, yellow and black dots that subtract light bouncing off the sheet. The more ink, the darker the result. Paper stock, ink limits and the press itself all shape what is possible.

The practical consequence is that RGB has a wider gamut — a bigger range of reachable colour — than CMYK. Some of what you see on screen cannot be printed at all, so your software has to substitute the nearest ink mix it can manage. That substitution is where most portfolio exports go wrong.

Where the two overlap

Within RGB there are further choices. sRGB is a modest, well-behaved space that every browser understands. Adobe RGB and ProPhoto RGB hold more colour, which is useful while editing, but the extra is invisible online. On the print side, CMYK is not one thing either: US Web Coated, Coated FOGRA39 and similar profiles describe particular presses and papers, and they give slightly different results from the same artwork.

Your screen is not a neutral reference

Monitors are bright, self-illuminated and frequently uncalibrated. A laptop at full brightness makes any file look punchier than it is. Browsers and viewing apps also handle colour profiles inconsistently, so the same JPEG can look different in two windows.

You do not need a laboratory. A hardware calibrator is the honest answer if you sell print work, but a few habits get you most of the way: drop screen brightness to something comfortable rather than maximum, view artwork against a neutral grey background, and never make final colour decisions on a screen you have not compared with a physical print.

What actually goes wrong in an export

• Vivid colours flatten. Bright cyan, saturated oranges, some greens and purples sit outside CMYK. They get clipped to the nearest printable ink, which reads as muddy rather than merely different.
• Whites shift. RGB white carries no ink, so it becomes paper white. Print on cream or recycled stock and your crisp white becomes cream.
• Blacks go wrong in two directions. A default conversion can turn black into a heavy four-colour mix that fringes when the press misregisters, or into a flat grey that looks weak next to the rest of the page.
• Untagged files get guessed at. If a profile is missing, one app assumes sRGB, another treats the numbers as press values, and the colours change with no warning.
• CMYK goes online. Browsers are built for RGB. A CMYK JPEG may display inverted or dull, so printed artwork needs converting back before it appears on your site.

Choose the mode for the destination, not the artwork

Treat the colour mode as an export decision. Keep one master and derive versions from it.

• Website, PDF portfolio, social: sRGB, with the profile embedded. JPEG for photographs, PNG or WebP where you need clean edges or transparency.
• Commercial press or print-on-demand: convert to the CMYK profile your printer names. If they do not name one, ask before you send anything.
• Desktop inkjet and photo labs: these usually prefer RGB files and convert internally, so follow their instructions rather than converting yourself.
• Fine art and giclée: often RGB with a wide-gamut profile, printed through a bespoke setup that matches the paper.

A workflow that keeps both versions usable

1. Keep a master in RGB, 16-bit where your software allows. Never overwrite it, and never convert back and forth between modes — each round trip loses colour.
2. Duplicate the master for each destination. Work on the copy.
3. Soft proof before converting. Most editing apps can simulate a CMYK profile on screen, so you can see the clipping and decide what to do about it.
4. Convert to the named CMYK profile using relative colorimetric rendering with black point compensation, then judge the result rather than trusting it.
5. Fix the known troublemakers: set body text and fine lines in 100% K only; use a rich black such as 60/40/40/100 for large solid areas; keep total ink coverage inside the printer's limit, which they will tell you.
6. Export print files as PDF/X-4 with the correct output intent, or exactly the preset your printer requests, and check that fonts are embedded and images are at 300 ppi at final size.
7. For web, take the RGB master, convert to sRGB, resize to the pixels you actually need, apply light sharpening, and export. Check the file in a browser, not just in your design app.

Make a proof before you commit

Soft proofing is a good guide and a poor substitute. The reliable test is physical: order a proof, or print a single sheet containing your trickiest colours — a saturated orange, a bright cyan, a pale skin tone, a deep shadow — alongside a strip of known greys. Compare it with your screen in daylight, not under a desk lamp.

Keep that sheet. After two or three projects you will know roughly how far your screen drifts, and you can compensate before the file leaves your machine rather than after the courier arrives.

What to do next

Pick one piece from your portfolio and export it twice: once as sRGB for the screen, once as CMYK for the profile your printer uses. Look at both next to the master. The differences will tell you more in ten minutes than any explanation of gamuts can.

Then build the habit into your file structure — a master, a screen version, a print version, clearly named. Colour management stops being a mystery once it becomes part of the routine, and your portfolio stops surprising you at the worst possible moment.

Photo: aldobarquin / Pixabay