An extensive JSON prompt for Gemini Nano Banana, designed for image-to-image transformation. It applies a warm-toned, film-like vintage aesthetic with harsh flash lighting and realistic grain to an input photo, while strictly preserving the subject's facial identity and skin texture (no smoothing or AI alterations).
Prompt Preview
{ "meta":{ "quality":"High-Definition", "type":"Evening indoor flash portrait", "ratio":"4:5 vertical", "device":"iPhone 16 Pro", "style_reference":"Transform the INPUT PHOTO into this exact aesthetic.", "look":"Evening flash, warm-toned vintage, real grain, realistic skin texture (NO smoothing)." },
"identity_lock":{ "preserve_face": true, "strict": true, "rules":[ "The face MUST remain IDENTICAL to the input photo.", "No changes to facial structure, proportions, expression, or identity.", "No smoothing, no beautify, no retouch, no AI facial alterations." ] },
"skin_texture_rules":{ "keep_texture": true, "no_smoothing": true, "no_blur": true, "realistic_details": "natural texture preserved.", "flash_behavior":"Flash highlights should reveal texture, not hide it." },
"vintage_effect":{ "warmth":"{argument name="warmth" default="+18"}", "contrast":"{argument name="contrast" default="+22"}", "highlights":"{argument name="highlights" default="-5"}", "shadows":"{argument name="shadows" default="+12"}", "grain":"{argument name="grain" default="Medium (film-like)"}", "vignette":"{argument name="vignette" default="Soft"}", "color_grade":"{argument name="color grade" default="Warm beige vintage tint"}", "sharpness":"{argument name="sharpness" default="Slightly reduced to mimic old camera softness"}" },
"global_context":{ "scene_description":"{argument name="scene description" default="Indoor hallway with wall decor, mirror reflection, white walls and warm flash lighting."}", "time_of_day":"{argument name="time of day" default="Evening"}", "lighting":"{argument name="lighting" default="Direct warm flash illuminating the subject with strong falloff into the background."}", "environment_details":[ "{argument name="environment detail 1" default="Mirror behind the subject with reflection visible."}", "{argument name="environment detail 2" default="White paneled walls."}", "{argument name="environment detail 3" default="Marble/stone console table with a floral arrangement."}", "{argument name="environment detail 4" default="Soft shadows created by harsh flash."}" ] },
"composition":{ "camera_angle":"{argument name="camera angle" default="Eye-level, straight-on portrait"}", "framing":"{argument name="framing" default="Knees-up full portrait"}", "pose":"{argument name="pose" default="Body leaning slightly forward with one hand on console table and the other arm across the torso."}", "expression":"{argument name="expression" default="Confident, pouty, soft glamorous gaze."}", "flash_effect":"{argument name="flash effect" default="Glossy highlights on skin and dress."}" },
"subject":{ "makeup":{ "style":"{argument name="makeup style" default="Soft glam."}", "lips":"{argument name="lips" default="Pink-brown gloss with warm undertone."}", "eyes":"{argument name="eyes" default="Eyeliner + lashes."}", "blush":"{argument name="blush" default="Warm peach."}" }, "skin":"{argument name="skin" default="Natural undertone, realistic texture, NOT smoothed."}", "outfit":{ "dress":"{argument name="dress" default="White mini halter dress with deep neckline and satin-like shine."}", "fabric_behavior":"{argument name="fabric behavior" default="Flash creates bright reflections and visible folds."}" } },
"background_objects":[ { "id":"mirror", "description":"{argument name="mirror description" default="Large wall mirror reflecting the subject's pose."}", "lighting":"{argument name="mirror lighting" default="Flash reflection visible but subdued."}" }, { "id":"flowers", "description":"{argument name="flowers description" default="Vibrant bouquet on the table (yellow, purple, green)."}" }, { "id":"wall", "description":"{argument name="wall description" default="White paneled wall with framed signage."}" } ],
"rules":{ "identity_constant": true, "no_face_change": true, "no_ai_artifacts": true, "realism":"{argument name="realism" default="Ultra realistic evening flash aesthetic with vintage tones."}" } } Use the uploaded photo as the input image. Generate the image.
