Nano Banana で使えるテキストから画像生成へのプロンプトのコツ 6 選

1from google import genai
2from google.genai import types
3from PIL import Image
4from io import BytesIO
5
6client = genai.Client()
7
8# Generate an image from a text prompt
9response = client.models.generate_content(
10    model="gemini-2.5-flash-image-preview",
11    contents="A photorealistic close-up portrait of an elderly Japanese ceramicist with deep, sun-etched wrinkles and a warm, knowing smile. He is carefully inspecting a freshly glazed tea bowl. The setting is his rustic, sun-drenched workshop with pottery wheels and shelves of clay pots in the background. The scene is illuminated by soft, golden hour light streaming through a window, highlighting the fine texture of the clay and the fabric of his apron. Captured with an 85mm portrait lens, resulting in a soft, blurred background (bokeh). The overall mood is serene and masterful.",
12)
13
14image_parts = [
15    part.inline_data.data
16    for part in response.candidates[0].content.parts
17    if part.inline_data
18]
19
20if image_parts:
21    image = Image.open(BytesIO(image_parts[0]))
22    image.save('photorealistic_example.png')
23    image.show()

1from google import genai
2from google.genai import types
3from PIL import Image
4from io import BytesIO
5
6client = genai.Client()
7
8# Generate an image from a text prompt
9response = client.models.generate_content(
10    model="gemini-2.5-flash-image-preview",
11    contents="A kawaii-style sticker of a happy red panda wearing a tiny bamboo hat. It's munching on a green bamboo leaf. The design features bold, clean outlines, simple cel-shading, and a vibrant color palette. The background must be white.",
12)
13
14image_parts = [
15    part.inline_data.data
16    for part in response.candidates[0].content.parts
17    if part.inline_data
18]
19
20if image_parts:
21    image = Image.open(BytesIO(image_parts[0]))
22    image.save('red_panda_sticker.png')
23    image.show()

1from google import genai
2from google.genai import types
3from PIL import Image
4from io import BytesIO
5
6client = genai.Client()
7
8# Generate an image from a text prompt
9response = client.models.generate_content(
10    model="gemini-2.5-flash-image-preview",
11    contents="Create a modern, minimalist logo for a coffee shop called 'The Daily Grind'. The text should be in a clean, bold, sans-serif font. The design should feature a simple, stylized icon of a a coffee bean seamlessly integrated with the text. The color scheme is black and white.",
12)
13
14image_parts = [
15    part.inline_data.data
16    for part in response.candidates[0].content.parts
17    if part.inline_data
18]
19
20if image_parts:
21    image = Image.open(BytesIO(image_parts[0]))
22    image.save('logo_example.png')
23    image.show()

1from google import genai
2from google.genai import types
3from PIL import Image
4from io import BytesIO
5
6client = genai.Client()
7
8# Generate an image from a text prompt
9response = client.models.generate_content(
10    model="gemini-2.5-flash-image-preview",
11    contents="A high-resolution, studio-lit product photograph of a minimalist ceramic coffee mug in matte black, presented on a polished concrete surface. The lighting is a three-point softbox setup designed to create soft, diffused highlights and eliminate harsh shadows. The camera angle is a slightly elevated 45-degree shot to showcase its clean lines. Ultra-realistic, with sharp focus on the steam rising from the coffee. Square image.",
12)
13
14image_parts = [
15    part.inline_data.data
16    for part in response.candidates[0].content.parts
17    if part.inline_data
18]
19
20if image_parts:
21    image = Image.open(BytesIO(image_parts[0]))
22    image.save('product_mockup.png')
23    image.show()

1from google import genai
2from google.genai import types
3from PIL import Image
4from io import BytesIO
5
6client = genai.Client()
7
8# Generate an image from a text prompt
9response = client.models.generate_content(
10    model="gemini-2.5-flash-image-preview",
11    contents="A minimalist composition featuring a single, delicate red maple leaf positioned in the bottom-right of the frame. The background is a vast, empty off-white canvas, creating significant negative space for text. Soft, diffused lighting from the top left. Square image.",
12)
13
14image_parts = [
15    part.inline_data.data
16    for part in response.candidates[0].content.parts
17    if part.inline_data
18]
19
20if image_parts:
21    image = Image.open(BytesIO(image_parts[0]))
22    image.save('minimalist_design.png')
23    image.show()

1from google import genai
2from google.genai import types
3from PIL import Image
4from io import BytesIO
5
6client = genai.Client()
7
8# Generate an image from a text prompt
9response = client.models.generate_content(
10    model="gemini-2.5-flash-image-preview",
11    contents="A single comic book panel in a gritty, noir art style with high-contrast black and white inks. In the foreground, a detective in a trench coat stands under a flickering streetlamp, rain soaking his shoulders. In the background, the neon sign of a desolate bar reflects in a puddle. A caption box at the top reads \"The city was a tough place to keep secrets.\" The lighting is harsh, creating a dramatic, somber mood. Landscape.",
12)
13
14image_parts = [
15    part.inline_data.data
16    for part in response.candidates[0].content.parts
17    if part.inline_data
18]
19
20if image_parts:
21    image = Image.open(BytesIO(image_parts[0]))
22    image.save('comic_panel.png')
23    image.show()