In GIMP, a color profile explains the numbers before you change them

Find the file’s starting point

A photograph can look dull in one program and bright in another even before anybody edits it. Color management describes how stored values relate to a color space and how a device presents them.

GIMP’s versioned documentation explains profiles for images and devices, along with soft proofing. This researched tutorial is for teen and adult creators preparing work for screens or print; allow an hour for a careful comparison.

Begin with a duplicate of a picture whose existing profile is known. Record its dimensions, profile and intended destination.

Resist adjusting saturation immediately. If one application interprets the stored numbers differently, changing the artwork may disguise the symptom while creating another error elsewhere.

The first useful question is what the file’s numbers mean in the current workflow.

Separate assignment from conversion

Assigning a profile tells software how to interpret the existing numbers. Converting between profiles changes the numbers to preserve the appearance as closely as that conversion allows.

Those are different operations. If a file’s profile is genuinely unknown, guessing a new assignment is not the same as discovering its origin.

Look for export notes or ask the creator before treating the guess as established.

Consider a hypothetical red with recorded channel values that were created in one RGB color space. Giving those same values a different interpretation can produce a different visible red.

A conversion instead uses the source and destination profiles to translate the values. This is a conceptual worked example, not a color measurement or a claim that any two monitors will display an exact match.

Choose the receiving conditions

For a screen delivery, follow the receiving service’s documented requirements and retain an appropriate embedded profile. GIMP’s PNG export page includes a color-profile choice.

For print, obtain the printer or print service’s requested workflow and profile rather than inventing a universal setting. Soft proofing can simulate a destination within the limits of the available profiles and display; it does not replace a physical proof when color accuracy matters.

Create a small test export with a neutral area, a saturated color and a shadow detail. Open it in a color-managed viewer and compare it with the working image under consistent viewing conditions.

Note what application you used and whether the profile is present. A phone in bright daylight and a desktop monitor in a dim room are poor grounds for diagnosing a precise color-space error by memory.

Keep a decision record

If the print service supplies a proof, compare that proof with the intended purpose. A photograph’s mood may tolerate a small shift that an identification chart cannot.

Describe the requirement in concrete language: “The two categories must remain distinguishable,” or “The dark texture should remain visible.” That turns vague dissatisfaction into a check the receiving team can understand.

Save the original, the editable revision and the chosen export separately, with a note about profiles and destination. Do not promise identical appearance on every screen.

This article draws on the GIMP manual and proposes a workflow; it does not report a calibrated-monitor test. A reliable process preserves the original interpretation, records any conversion and checks the actual output in the conditions that matter.

Include a small neutral reference area when your project permits it, and retain the test image with the delivery note. Comparing the same reference across exports is more informative than comparing different photographs whose lighting and content already differ.