Gemini 2.5 Flash Image Generation & Editing Official Guide
Mastering Gemini 2.5 Flash Image's image generation capabilities begins with a basic principle:
Describe the scene, not just list keywords.
The model's core strength lies in its deep language understanding capabilities. A narrative, descriptive paragraph will almost always produce higher quality, more coherent images than a bunch of disconnected words.
Prompts for Generating Images
The following strategies will help you create effective prompts to generate the precise images you expect.
1. Creating Photorealistic Scenes
To achieve realistic images, use photography terminology. Explicitly mentioning camera angles, lens types, lighting, and fine details can guide the model to produce photorealistic results.
Prompt Template:
A photorealistic close-up portrait of an elderly Japanese potter...Transform the uploaded photo into a black and white portrait artwork... background with soft gradient effect... delicate film grain texture...
2. Generating Stylized Illustrations & Stickers
To create stickers, icons, or design assets, clearly specify the style and request transparent backgrounds.
Prompt Template:
A kawaii-style sticker of a happy little panda...Based on the person in the photo, generate a 4-panel avatar sheet, each avatar with different expressions and poses...
3. Accurate Text in Images
Gemini excels at rendering text. Clearly specify the text content, font style (using descriptive words), and overall design.
Prompt Template:
Create a modern, minimalist logo for a coffee shop called "The Daily Grind"...Note: Currently the model supports English characters well, while Chinese character generation is still a weakness and may produce errors or poor results.
4. Product Mockups & Commercial Photography
This feature is perfect for creating clean, professional product photos for e-commerce, advertising, or branding.
Prompt Template:
A high-resolution studio-lit product photo of a minimalist ceramic coffee mug...Based on this hand-drawn sketch, generate 3 concept renderings: 1. Minimalist white design... 2. Sporty neon green... 3. Premium lifestyle version...
5. Minimalist & Negative Space Design
Suitable for creating backgrounds for websites, presentations, or marketing materials that need text overlay.
Prompt Template:
A minimalist composition featuring a delicate red maple leaf...The rest maintains minimalism with large negative space, allowing the image to breathe freely...
6. Creating Sequential Art (Comics/Storyboards)
Create panels for visual storytelling based on character consistency and scene descriptions.
Prompt Template:
A gritty, noir-style single comic panel...Generate a nine-panel comic based on the image content, telling a story through frames and camera angles.
Prompts for Editing Images
The following examples show how to provide images in text prompts for editing, compositing, and style transfer.
1. Adding and Removing Elements
Provide an image and describe your changes. The model will match the original image's style, lighting, and perspective.
Prompt Template:
Remove the person riding a motorcycle on the left side of the image and the motorcycle.Add a small cat crouching next to the person, proportionally appropriate.
2. Inpainting / Semantic Masking
Define a "mask" through conversational instructions to edit specific parts of the image while keeping the rest unchanged. This can be achieved through red boxes or masks.
Prompt Template:
Separate the person in the red box and turn it into a high-definition single portrait.Replace the brush area with a chanel bag.
3. Style Transfer
Provide an image and ask the model to recreate its content in a different artistic style.
Prompt Template:
Convert to Van Gogh's Starry Night style oil painting.Transform the person in the image into 3D style.
4. Advanced Composition: Combining Multiple Images
Provide multiple images as context to create a brand new composite scene. This is very effective for product mockups or creative collages.
Prompt Template:
Let the person in image one cosplay the character in image two, with matching costumes, makeup, and props.The model in image one wears the clothes in image two and wears the necklace.
5. High-Fidelity Detail Preservation
To ensure key details (such as faces or logos) are preserved during editing, describe them in detail in your editing request.
Prompt Template:
Keep the character's styling completely unchanged and place them in a coffee shop.
Best Practices
Incorporating these professional strategies into your workflow can elevate results from "good" to "excellent."
- Be Hyper-Specific: The more details you provide, the more control you have. Instead of "futuristic armor," describe: "An ornate elven plate armor etched with silver leaf patterns, with a high collar and shoulder guards shaped like falcon wings."
- Provide Context and Intent: Explaining the purpose of the image helps the model better understand your needs. For example, "Create a logo for a high-end, minimalist skincare brand" will get better results than "Create a logo."
- Iterate and Refine: Don't expect perfect images in one go. Use the model's conversational features to make fine adjustments, such as following up with: "Good, but can you make the lighting warmer?"
- Use Step-by-Step Instructions: For complex scenes with multiple elements, break your prompt into multiple steps. For example: "First, create a peaceful forest background. Then, add a stone altar in the foreground. Finally, place a glowing sword on the altar."
- Use "Semantic Negative Prompts": Rather than using negative words (such as "no cars"), positively describe the scene you want: "An empty, desolate street with no signs of traffic."
- Control the Camera: Use photography and cinematography terms to control composition, such as
wide-angle shot,macro shot,gobo lighting, etc.
Limitations
- The model doesn't always precisely follow explicit user requirements for generating a specific number of images.
- As input, the model works best when processing up to 3 images.
- In EEA, CH, and UK regions, uploading children's photos is currently not supported.
- All generated images include a SynthID watermark.