2. Use GPT Image 2 to re-render the image
With the provided prompt, upload the image and ask it to restore, enhance, or upscale it. You can also use a simpler prompt if you only want to upscale and there are 2 or 3 specific defects you have pinpointed and want to fix.
When you only want to improve the resolution, you can add character references so it doesn't modify the textures. Add phrases and images that help preserve the style.
Prompt (upscale with character references): Upscale this image. Preserve colors and lightning and color grade. Use images 2, 3 and 4 as a reference to render look and textures of the characters.
Prompt (image restoration of character sheet): Restore and enhance this character reference sheet while preserving the exact original composition, layout, character design, proportions, colors, lighting style, shading, materials, and artistic style. Keep all views and portrait close-ups exactly in the same positions and preserve the original pastel pink-to-blue hair gradient, skin tones, clothing colors, boot glow, and neutral gray background tone.
Clean up all visible compression and quality defects, including banding, posterization, debanding artifacts, mild blur, edge halos, ringing, dirty edges, compression smearing, and loss of fine detail. Smooth the tonal transitions in the background, hair, skin, and clothing so gradients become clean and continuous, but do not change the original colors or lighting.
Restore fine detail in the hair strands, bangs, clothing fabric, denim shorts, fishnet gloves, straps, buckles, chain, stitching, and boot laces, making them cleaner and sharper without changing the design. Improve edge quality around the hair silhouette, clothes, boots, accessories, and close-up portraits, removing artifacts while keeping the original shape exactly.
Keep the image looking like the same polished 3D stylized character sheet, only cleaner, higher resolution, and artifact-free. Do not redesign any element, do not alter the pose, expression, anatomy, proportions, texture style, or material response. The result should be a high-quality restoration/upscale of the same image, with preserved original colors, preserved proportions, preserved lighting mood, and preserved texture style.
Prompt (realistic image): Upscale this image. Preserve colors and lightning and color grade. Use images 2, 3 and 4 as a reference to render look and textures of the characters.
Prompt (anime): Upscale these images. Preserve the anime, cel-shaded style. Do not add realistic textures. High-quality Japanese animation image. Preserve the original lighting, format, and colors.