动漫风格 AI 图像更新横幅

Goal: Create a high-energy Japanese promotional banner for a tech update about AI image generation, styled like an anime idol rock concert poster.

Canvas: Wide horizontal web banner, 2:1 aspect ratio, approximately 1000×500 px. Use a dense, colorful composition with cinematic lighting, sparkles, stars, lens flares, and a festive concert-stage atmosphere.

Main text: Place large bold Japanese headline text across the top in thick white letters with a heavy black drop shadow: {argument name="headline text" default="ChatGPTによる画像生成が\n大幅アップデート!"}. Under it, centered in smaller bold white text with black outline: {argument name="subtitle text" default="GPT-Image-2が無料で使える"}. Make the typography oversized, glossy, and attention-grabbing, occupying the upper third of the banner.

Layout and subjects: Show exactly 5 anime-style band members across the bottom half, arranged left to right:
1. A blue-haired keyboard player on the far left, long blue hair, white blouse, sitting or standing behind a keyboard/synth, face covered by a soft rectangular blur mask.
2. A pink twin-tail idol singer left of center, frilly pink outfit, flower hair accessories, holding a microphone, cheerful expression, fully visible face.
3. A central golden-yellow-haired drummer/front idol, bright yellow cropped jacket and star accessories, holding drumsticks, smiling widely toward the viewer, most prominent character, positioned in front of a drum kit.
4. A dark green-haired bassist/guitarist right of center, black and green outfit, holding a guitar, face covered by a soft rectangular blur mask.
5. A black-haired purple-themed guitarist on the far right, gothic black outfit with straps and accessories, holding a purple electric guitar, face covered by a soft rectangular blur mask.

Background: Put a glowing OpenAI-style knot logo in the center behind the characters, surrounded by a golden circular light halo. Add futuristic monitor panels on both far sides: left monitor with neon interface rings and control panels, right monitor with colorful image-generation style artwork and UI panels. Include stage lights, musical notes, star icons, confetti-like sparkles, bokeh dots, and diagonal light streaks throughout.

Visual style: Vibrant anime illustration, glossy digital art, concert poster energy, saturated pink, gold, purple, and blue palette, dramatic backlighting, high contrast, crisp outlines, polished promotional thumbnail style.

Constraints: Use exactly 5 band members and exactly 2 lines of headline/subtitle text. Keep the Japanese text readable and dominant. Do not add extra logos except the abstract OpenAI-style glowing emblem. No watermark.