Why Is My GIMP Soft-Proof Preview Unchanged?

Selecting a Profile Is Not the Same as Displaying Its Simulation

GIMP provides Image → Color Management → Soft-Proof Profile… to associate a soft-proof profile with the image. The documentation explains that this is usually a profile for the specific printer intended to produce the artwork.

The dialog displays the currently assigned soft-proof profile and allows you to choose another. Its replacement selection defaults to None. You can select a previously used profile or choose a profile file from disk.

However, selecting a profile alone does not mean the proof simulation is visible. To view the intended approximation, enable View → Color Management → Proof Colors.

Decision branch: If you have selected a profile but see no simulation, check Proof Colors first. If the wrong profile is assigned, correct that selection before judging the preview.

The GIMP Soft-Proof Profile documentation describes selecting the simulation profile separately from displaying the proof.

Check Rendering Intent Separately

Rendering intent is the color-mapping choice used for the soft-proof simulation. GIMP places it under Image → Color Management → Soft-Proofing Rendering Intent, separately from the chosen proof profile and the Proof Colors display switch.

The documentation identifies Relative colorimetric as the default and usually the best choice. It also states that choosing Perceptual gives relative-colorimetric behavior unless a LUT monitor profile is used; most monitor profiles are matrix profiles.

LUT means lookup table. Here LUT and matrix describe the monitor/display profile, not the printer profile selected for soft proofing. Do not classify the printer's proof profile as LUT or matrix to answer this particular condition.

If the monitor-profile type is unknown, record its identity and mark the type unknown; consult its provider or the person managing display calibration. Meanwhile, first verify Proof Colors and the intended printer proof profile. An unchanged intent comparison alone does not establish a broken control or a failed print simulation.

The GIMP rendering-intent documentation gives the specific LUT-monitor qualification for Perceptual.

Illustrative Exercise: Compare Two Artwork Inputs

Illustrative exercise — hypothetical artwork, not tested GIMP files. A is a colorful promotional card; B is a packaging insert with restrained colors and small text.

For A, record the intended printer proof-profile identity. Keep that profile and the rendering intent unchanged while comparing Proof Colors off and on, then record the actual visible difference, including none.

For B, keep Proof Colors enabled and the proof profile fixed while comparing Relative colorimetric and Perceptual. Record the display-profile identity and its known LUT/matrix type, or unknown. Interpret the comparison using the documented monitor-profile qualification.

If the intended printer profile is unavailable, obtain it before relying on the simulation. If display-profile information is unknown or the views look similar, preserve that uncertainty rather than inventing a difference or treating it as verified print acceptance.

Separate Screen Proofing From Final Print Acceptance

Soft proofing previews an approximation using the selected output profile. Selecting its profile and enabling Proof Colors do not themselves convert the image's pixels or establish a physical match to paper, ink and printing conditions.

Keep the proof-profile identity, preview state, intent and relevant display-profile information in the review record. Any final print check remains a separate task with its own actual evidence; the cited documentation does not supply a verified result for a merchant's printer or packaging material.

For a separate image-profile decision, the Chinese GIMP assign-versus-convert guide explains assignment and conversion rather than the proof-view switch.

Soft-Proof Review Record — Fill With Actual Settings and Observations

These are illustrative exercise rows. Save a copy and record your own observations; the example is not an executed acceptance test.

Download review worksheet (CSV)