Check stripe direction, repetition and whether bands cross unrelated objects to distinguish potential printer banding from intentional shading in the artwork. Designed shading follows the image's light, objects or stylistic pattern; print banding often creates repeated light or dark stripes that do not respect those elements. The first check is to compare the finished canvas with the approved source image at a meaningful scale. An isolated photo of a print rarely shows enough context to determine the cause reliably.
Use image content to test whether stripes are intentional
Look for bands that follow a painted sky gradient, photographic shadow, digital halftone or deliberate striped design. If the transition appears in the original file and changes naturally with the depicted scene, it may be part of the composition. Screen captures can introduce their own artifacts, so use the actual saved master image where possible. If an artist intentionally added posterization or stepped tones, it should not be mistaken for a mechanical defect merely because it looks abrupt.
Examine the same region at different scales. Some image gradients look smooth when viewed from a distance but reveal discrete steps when magnified; that may be present before printing. Conversely, a narrow repeating stripe across several unrelated image areas may be absent from the master. Take notes about stripe direction, spacing, width and whether the same pattern extends through varied colors. These observations help the production team assess what happened.
A sunset photograph has a gradual darkening toward its horizon, but the finished canvas also displays several evenly spaced pale horizontal stripes cutting across a boat, sky and shoreline. Open the final approved file and locate those exact positions. A gradient following the light may belong to the scene; repeating stripes through unrelated forms deserve production review. Photograph the canvas square-on under balanced light and report the pattern, spacing and affected regions without concluding that a particular printhead or ink system is responsible.
Recognize clues that suggest a printing process issue
Common inkjet troubleshooting materials describe white or dark lines caused by factors such as clogged nozzles, unsuitable media settings or printhead alignment on particular devices. Those examples show why banding can be process-related, but they do not identify the equipment used for this canvas. Avoid telling a buyer that a machine definitely needs cleaning based only on a photograph. A qualified printer should compare machine logs, settings and controlled output.
A pattern that stays parallel, repeats at regular intervals and crosses distinct image objects is more suspicious than shading that tracks the picture's natural geometry. Note whether the artifact is visible across a broad uniform area or only in a dark gradient. It is useful to compare a separate print of the same file made with the same documented setup, if a legitimate test is available. Different coatings and viewing angles can complicate the comparison.
Document the discrepancy without altering the print
Photograph the whole canvas in diffuse light and then the affected zone with enough context to show stripe direction. Keep the original, unedited camera files and record whether flash or artificial lighting was used. Provide the approved source file version and describe exactly where the lines appear. Do not apply liquid, abrasive cleaners or retouching products while attempting to distinguish ink defects from surface texture; such actions can obscure evidence and damage a coating.
If the printmaker determines that the stripes were introduced by the production process, discuss what correction or replacement is appropriate under the actual order terms. If the source file itself contains stepped tones, an image-editing conversation may be more relevant. A new print will not automatically fix a gradient already embedded in the artwork. The correct remedy depends on a verified cause, not on labeling every stripe as the same technical fault.
The decisive distinction is whether the repeated tonal pattern was in the authorized image and whether it changes according to picture content. Use source comparisons, consistent photographs and production evidence to make that judgment. The purpose is a fair diagnosis, not a guarantee that every faint line is unacceptable or that any particular Wallpics printing process is at fault.