How subtractive color works
Ink absorbs light rather than emitting it. Each ink removes part of the white paper's reflection, so layers build darker and darker as more colors are added.
Cyan, magenta, and yellow theoretically combine to black, but real inks produce a muddy brown instead, which is why a dedicated black channel is included for clean text and shadows.
Why RGB colors shift in print
Screens can show saturated greens and blues that ink cannot reproduce, so a straight conversion inevitably moves some colors. Bright neons and deep screen blues are the usual casualties.
Print workflows manage this with profiles and, for critical jobs, proofing. Designing in CMYK from the start avoids surprises because the designer already works inside the printable range.
- Four channels: cyan, magenta, yellow, and black
- Total ink limits prevent soaking the paper
- Black text stays crisp in the dedicated channel
- Vivid screen colors may fall outside the printable range
CMYK and everyday documents
Office printers and home devices handle the conversion automatically, so most people never see the model directly. Commercial print jobs are where explicit CMYK control matters.
Filekind does not convert color spaces. It builds PDFs from JPG, PNG, and static WebP images in the browser, and the receiving printer or service decides how colors are produced. For office printing that handoff is invisible, while commercial jobs usually specify the profile the press expects before the file is sent.