AI画像生成で3つのiOSアプリアイコンをリデザインした実践記録

- Fill the entire canvas edge-to-edge with a uniform {{BACKGROUND_COLOR}} background.
+ Fill the entire canvas edge-to-edge with a rich {{BACKGROUND_COLOR}} background
+   featuring a smooth radial gradient from a slightly brighter tone at the
+   top-center to a deeper tone at the edges.

- Style: elegant, minimal color palette, flat design, no gradients on
-   illustration, no shadows, no 3D effects.
+ Style: modern iOS aesthetic — smooth gradient background, soft lighting
+   from above, minimal color palette. Subtle depth through lighting,
+   NOT through drop shadows or 3D extrusion.

+ The overall feel should be premium and refined, similar to Apple's
+   native app icons (smooth gradients, gentle highlights, no hard edges).

A polished, square 1024x1024 app icon for an iOS app called "KotenOCR"
that recognizes classical Japanese cursive script (kuzushiji) and
modern printed/handwritten text using on-device AI.

Design requirements:
- Fill the entire canvas edge-to-edge with a rich deep navy background
  featuring a smooth radial gradient from a slightly brighter navy
  (#243B55) at the top-center to a deep navy (#0F1C2E) at the edges.
  No white areas, no transparency, no empty corners.
- Do NOT include frames, borders, or decorative edges of any kind.
- Center illustration: a stylized classical Japanese kanji character
  "典" (meaning "classic/canon") drawn in elegant brushstroke
  calligraphy style, rendered in white (#FFFFFF) with a very subtle
  soft glow effect behind it to give gentle luminosity.
- Include one teal (#4DB6AC) scanning viewfinder bracket (two
  L-shaped corner marks, top-left and bottom-right) surrounding the
  character to suggest OCR recognition. The brackets should have a
  subtle inner glow.
- A few faint, partially visible kuzushiji characters scattered in
  the background at very low opacity (#1A2A3A) to evoke a classical
  manuscript atmosphere, as if emerging from the dark background.
- Style: modern iOS aesthetic — smooth gradient background, soft
  lighting from above, minimal color palette (deep navy gradient +
  white calligraphy + teal accent). Subtle depth through lighting,
  NOT through drop shadows or 3D extrusion.
- The overall feel should be premium and refined, similar to Apple's
  native app icons (smooth gradients, gentle highlights, no hard
  edges).
- The central character should be bold and dominant, clear at small
  sizes (29px). Medium-to-bold weight brushstrokes.
- Do NOT add any text, letters, or labels other than the central
  kanji character.
- Do NOT pre-round corners — perfectly square image. iOS applies
  rounded corners automatically.
- Output: square PNG, 1024x1024 pixels.

A polished, square 1024x1024 app icon for an iOS app called "IIIF AR"
that places high-resolution historical Japanese maps and illustrations
in augmented reality at real-world scale.

Design requirements:
- Fill the entire canvas edge-to-edge with a rich warm background
  featuring a smooth radial gradient from a slightly brighter warm
  tone (#3A2F28) at the top-center to a deep dark brown (#1A1410)
  at the edges. No white areas, no transparency, no empty corners.
- Do NOT include frames, borders, or decorative edges of any kind.
- Center illustration: a stylized composition of overlapping
  historical Japanese maps and scrolls — one partially unrolled scroll
  and one flat map, showing fragments of traditional ink landscape art
  (mountains, rivers, architecture in East Asian brushwork style),
  rendered in warm cream/gold (#E8D5A8) line art with a subtle soft
  glow behind the composition.
- Include one teal-blue (#1E88E5) AR location pin marker placed on
  the map to suggest spatial AR placement. The pin should have a
  subtle inner glow.
- Below the maps, include a faint perspective grid (3-4 thin lines
  in #2A2420) to represent the AR floor plane detection.
- Style: modern iOS aesthetic — smooth gradient background, soft
  lighting from above, minimal color palette (dark warm brown
  gradient + cream/gold illustration + one blue accent). Subtle depth
  through lighting, NOT through drop shadows or 3D extrusion.
- The overall feel should be premium and refined, similar to Apple's
  native app icons (smooth gradients, gentle highlights, no hard
  edges).
- The illustration should be detailed enough to be interesting but
  clear at small sizes (29px). Medium-weight lines.
- Do NOT add any text, letters, or characters.
- Do NOT pre-round corners — perfectly square image. iOS applies
  rounded corners automatically.
- Output: square PNG, 1024x1024 pixels.

A polished, square 1024x1024 app icon for an iOS app called
"JPS Explorer" that lets users discover and explore Japan's cultural
heritage collections through Japan Search.

Design requirements:
- Fill the entire canvas edge-to-edge with a rich deep navy background
  featuring a smooth radial gradient from a slightly brighter navy
  (#1E3450) at the top-center to a deep navy (#0C1A2E) at the edges.
  No white areas, no transparency, no empty corners.
- Do NOT include frames, borders, or decorative edges of any kind.
- Center illustration: a stylized magnifying glass tilted slightly
  (handle pointing to bottom-right), with a polished gold/brass frame
  and handle rendered with smooth metallic gradients and soft
  highlights to convey premium quality.
- Inside the magnifying glass lens: a traditional Japanese seigaiha
  (青海波 / blue ocean wave) pattern in gold (#C8A85C) lines on a
  slightly lighter navy background, visible through a subtle glass
  lens effect (very mild refraction/distortion).
- Behind the magnifying glass, faintly visible: a few scattered
  fragments of Japanese cultural imagery at very low opacity
  (#152540) — such as a partial ukiyo-e wave, a torii gate outline,
  or a maple leaf — to suggest the breadth of the collection.
- Style: modern iOS aesthetic — smooth gradient background, soft
  lighting from upper-left, metallic gold with gentle reflections.
  Subtle depth through lighting and metallic sheen, NOT through hard
  drop shadows or 3D extrusion.
- The overall feel should be premium and refined, similar to Apple's
  native app icons (smooth gradients, gentle highlights, elegant
  materials).
- Clear at small sizes (29px) — the magnifying glass shape should
  be immediately recognizable.
- Do NOT add any text, letters, or characters.
- Do NOT pre-round corners — perfectly square image. iOS applies
  rounded corners automatically.
- Output: square PNG, 1024x1024 pixels.

from PIL import Image

img = Image.open("generated_icon.png")

# 2048x2048の場合
margin = 130
cropped = img.crop((margin, margin, 2048 - margin, 2048 - margin))
resized = cropped.resize((1024, 1024), Image.LANCZOS).convert("RGB")
resized.save("AppIcon.png", "PNG")

from PIL import Image

img = Image.open("generated_icon.png")  # 2048x2048

# 角丸領域をカット（約180px）
margin = 180
cropped = img.crop((margin, margin, 2048 - margin, 2048 - margin))
resized = cropped.resize((1024, 1024), Image.LANCZOS).convert("RGB")
resized.save("AppIcon.png", "PNG")