Change Light Color

ROLE
Act as a senior professional photo retoucher, lighting artist, photographer and AI image-editing specialist. Perform a controlled, production-quality color adjustment to an existing light source in the uploaded image. Treat the source image as the ground truth and preserve everything that is not explicitly requested to change.

EDIT
Change the emitted color of [IDENTIFY THE TARGET LIGHT SOURCE] to [DESIRED LIGHT COLOR]. Update only the targeted light and the illumination, glow, color spill and reflections physically produced by it. Preserve the light’s original location, shape, size, direction and approximate intensity unless explicitly instructed otherwise.

PRIMARY OBJECTIVE
Execute the requested “Change Light Color” edit convincingly and naturally. The result should look like the existing light source originally emitted the requested color—not like a colored overlay was applied to the image. Preserve every person, object, surface and unrelated light source exactly.

EDITING PRIORITY

Change the targeted light source to the requested color.
Update its physically connected illumination and reflections.
Preserve the light’s original position, shape and intensity.
Preserve skin tones, object colors and unrelated lighting.
Keep all unrelated image content unchanged.

TARGET IDENTIFICATION

Modify only the light source clearly identified by the user.
If multiple similar lights exist, use the user’s positional description to determine the correct one.
Preserve all untargeted lamps, bulbs, LEDs, signs, screens and practical lights exactly.
Do not recolor the entire lighting system unless all visible lights are explicitly targeted.
If no target is specified, change only the most prominent visible artificial light source.
Do not mistake reflections, highlights or bright objects for the primary light source.

LIGHT-SOURCE COLOR

Match the requested hue accurately while keeping it within believable emitted-light values.
Preserve the original light source’s geometry, fixture, brightness pattern and falloff.
Keep the brightest central area naturally luminous without clipping all internal detail.
Preserve realistic variation between the bright core, colored edge and surrounding glow.
Do not turn the fixture itself into a flat block of color.
Maintain natural optical bloom proportional to the source’s brightness.
Preserve the source’s original softness or hardness.

COLOR SPILL & FALLOFF

Trace which nearby surfaces are genuinely illuminated by the targeted source.
Update those areas with the requested color according to their distance, angle and material.
Apply stronger color spill near the source and gradually weaken it with distance.
Respect occlusion: objects blocking the light must prevent the color from reaching areas behind them.
Preserve the three-dimensional form of faces, clothing, walls and objects receiving the light.
Keep unaffected surfaces neutral or lit by their original sources.
Do not spread the requested color uniformly across the entire image.

REFLECTIONS & MATERIAL RESPONSE

Update reflections caused by the targeted light on glass, mirrors, polished metal, water, glossy paint and other reflective surfaces.
Keep reflections aligned with the source’s position and viewing angle.
Preserve realistic differences between matte, glossy, translucent and reflective materials.
Apply only subtle colored highlights to skin, hair and fabric where physically appropriate.
Do not make matte materials unnaturally shiny.
Preserve all reflections unrelated to the targeted light.

SKIN & SUBJECT PROTECTION

Preserve every subject’s recognizable identity, facial geometry, expression and skin texture.
Allow the changed light color to affect only skin areas genuinely facing the source.
Preserve believable underlying skin tones and facial readability.
Do not recolor the entire face or body.
Preserve eye color, hair color, clothing color and makeup beneath the colored illumination.
Do not smooth skin, reshape features or apply beauty enhancement.

MULTIPLE LIGHT SOURCES

Preserve the influence of every untargeted light source.
Maintain realistic mixing where the recolored light overlaps with existing illumination.
Do not force neutral areas to adopt the new color.
Preserve existing shadow direction and contrast created by other lights.
Do not create additional light sources or conflicting highlights.
Keep the scene’s overall lighting hierarchy believable.

EXPOSURE & COLOR CONTROL

Preserve the original overall exposure and contrast.
Keep highlights controlled and retain important shadow detail.
Avoid excessive saturation, posterization and clipped color channels.
Preserve neutral whites and blacks outside areas affected by the targeted light.
Do not apply a global color grade, tint or white-balance shift.
Keep the result consistent with the source image’s dynamic range and photographic character.

STRICT PRESERVATION RULES

Change only the targeted light’s emitted color and its physically connected effects.
Preserve the original composition, crop, perspective and aspect ratio.
Preserve every person’s identity, anatomy, pose and expression.
Preserve clothing, accessories, objects, architecture and background details.
Preserve the targeted fixture’s design, position and physical structure.
Preserve all untargeted light sources and their illumination.
Do not add or remove lamps, signs, bulbs, objects or people.
Preserve the original depth of field, focus, grain, noise and compression.

ARTIFACT PREVENTION
Avoid:

applying a flat color filter to the image
recoloring every light source
changing the fixture’s design or position
excessive saturation or unnatural brightness
clipped or solid-colored light cores
colored illumination on blocked surfaces
inconsistent light direction or falloff
unrealistic reflections
glowing outlines around people or objects
excessive bloom, haze or fog
altered skin, eye, hair or clothing colors
crushed shadows or lost highlight detail
additional lights or decorative effects
changed objects, background or composition
obvious generative-AI artifacts

QUALITY CONTROL
Before finalizing, compare the result carefully with the source and verify that:

only the intended light source has changed color;
the requested hue is represented accurately;
the light’s position, structure and intensity remain consistent;
color spill follows believable direction, distance and occlusion;
reflections appear only on physically appropriate surfaces;
untargeted lights and their effects remain unchanged;
skin and object colors remain natural beneath the illumination;
no global tint or unrelated color grading was introduced;
all people, objects and scene details remain faithful to the source;
the finished result remains convincing at close inspection.

OUTPUT
Return one polished final image only. Preserve the original aspect ratio, resolution and framing. Use the highest practical image quality and detail available. Do not add captions, watermarks, borders, comparison labels or explanatory text.