AI Support for
Illustration Creation
copainter is an AI tool that assists in the creation of illustrations, manga, and anime.
By combining AI with creativity, it offers a richer creative experience.
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Features of copainter
The AI tool copainter streamlines production processes such as inking, undercoating, coloring, backgrounds, and finishing. It supports the creative activities of all creators, from professional artists to hobbyists, and assists in the production of high-quality works.
No high-performance PC or complex software is required to use the tool. Its intuitive web interface allows even those unfamiliar with AI tools to use it easily. copainter is a next-generation production support tool that expands the possibilities for creators and facilitates effortless creation.
Why not utilize illustration generation AIin your production process?
Examples of Using Illustration AI in Each Process
Line Art/Inking AI: Explore Your Own Style While Refining Line Art
[Line Art Function] Fidelity: 0.6, Line Thickness: 0, Stroke Start/End: 0, Auto Prompt Detection from Image
With the line art/inking function, you can create beautiful line art from rough sketches. By adjusting fidelity, you can maintain your unique style while achieving refined expressions. Additionally, prompts can be utilized for detailed style adjustments.
Coloring AI: Color According to the Image of the Work from Undercoating
AI Transformation Strength: 0.5, Detail Level: 0.5, Conversion Mode: Normal, Model: Brush Painting
Using the coloring function, natural coloring that aligns with the image of the work is possible from line art and undercoating. It supports various expressions such as brush painting, anime painting, and watercolor painting. Outputs are divided into layers, making post-processing editing easy. High-quality coloring can be efficiently achieved, even in professional production settings.
Image Transformation AI: For Reference Materials and Enhancing Works
[Top image] Original image[Left image] Original image
[Bottom image: Top] Model: faithful model, Prompt: blue hair, blue eyes, red hoodie, AI variation strength: 1, Faithfulness: 0.7, Fixed seed[Right image: Top] Model: faithful model, Prompt: blue hair, blue eyes, red hoodie, AI variation strength: 1, Faithfulness: 0.7, Fixed seed
[Bottom image: Bottom] Model: faithful model, Prompt: blue hair, blue eyes, red hoodie, Match input image, AI variation strength: 1, Faithfulness: 0.7, Fixed seed[Right image: Bottom] Model: faithful model, Prompt: blue hair, blue eyes, red hoodie, Match input image, AI variation strength: 1, Faithfulness: 0.7, Fixed seed
The image transformation function allows you to easily generate various illustration variations. You can expand your creative ideas by adjusting character expressions, poses, outfits, adding backgrounds, and more. By adjusting prompts and selecting transformation or creative models, it supports the creation of works in a wide range of styles.
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Creating Background Images
Photo Background Transformation AI + Coloring AI
By using the photo background transformation function, you can easily create background materials suitable for illustrations or manga from landscape photos with AI. It allows you to maintain the composition and atmosphere of the photo while expressing backgrounds that match the style of your work. Additionally, applying the coloring function to the generated background achieves a cohesive finish.
Creating Materials from 3D Models
Inking AI + Coloring AI
You can generate illustrations from 3D models, efficiently creating designs for character accessories. By converting models created with 3D CG software like VRoid into 2D illustrations, it enhances the versatility of character design and aids in multifaceted considerations for work development. Furthermore, combining the generated illustrations with the coloring function can lead to a highly complete finish.
Enhancing Existing Works
Coloring AI
Coloring monochrome rough sketches, image sketches, or line art can save time. It is particularly effective when remastering past works or during the color expansion of digitization. Even works previously published in monochrome can be easily colorized for broader distribution.
Reducing Workload in Production Settings
Inking AI
The inking function significantly improves drawing production speed. AI enhances line art quality and reduces the workload of corrections, allowing more time to be allocated to main production and drawing instructions. Additionally, it effectively reduces human inconsistencies in drawing uniformity.
Enterprise Plan
For corporate clients, we offer an Enterprise plan that includes custom AI models capable of producing your preferred art styles or characters.
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Introduction to Our AI Illustration Features
Lineart & Inking AI
This AI transforms rough sketches into clean lineart. Compared to standard inking tools, the lines are smoother and more natural. It can also automatically adjust line thickness and opacity to match the artist’s style. Ideal for streamlining the inking process, helping you move faster and more efficiently to the next stage. Supports a wide variety of styles, from casual submissions to professional customization. Suitable for both professional illustration and hobby sketches.
Undercoloring AI
Generates beautiful base colors from line art and rough coloring. The output is a PSD file with separate layers for each color, making it easy to make adjustments or add details. This significantly reduces the time needed for base coloring and efficiently supports your creative workflow.
Shadowing AI
Automatically generates shadows with ease. You can adjust the light source in real-time to modify the shadow direction and appearance. Multiple light sources are supported, enabling a variety of lighting environments and creative shadow expressions.
Coloring AI
Once undercoloring is complete, the AI performs detailed coloring. Supports various styles such as flat, anime-style, and watercolor. PSD format output allows editing and adjustments per layer, greatly reducing production time and enabling more focus on enhancing quality.
Image-to-Image AI
This AI transforms simple images into various illustration styles with text prompts. It can convert to anime-style, realistic-style, or photographic styles, and can also add backgrounds or change character expressions. Useful both in the production process and for enhancing completed works.
Upscaling AI
Easily enhance the resolution of your illustrations with AI. Supports horizontal/vertical magnification (e.g. 4x, 16x) and speed adjustment for flexible output. Uses illustration-optimized models to upscale without losing line sharpness or color detail. Ideal for use in SNS, posters, and animation production.
Photo Background Conversion AI
This AI recognizes and replaces backgrounds in photos automatically. It retains the subject's characteristics while harmonizing the new background, enabling effective and natural background transformations.
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PLAN
Please choose the best plan
FAQFor those who want to try it first
- 3 tickets each month
- Basic features of copainter
- No additional ticket purchase available
For those who want an easy and affordable trial
- 50 tickets each month
- Basic features of copainter
- Additional ticket purchase available
*Limited to general users and small businesses (annual sales less than 10 million yen in the most recent year).
For individuals who regularly use the service
- 300 tickets each month
- Basic features of copainter
- Additional ticket purchase available
*Limited to general users and small businesses (annual sales less than 10 million yen in the most recent year).
For those who want to use it extensively
- Unlimited usage
- Basic features of copainter
This plan is also available to corporate customers with annual sales of 10 million yen or more in the most recent year.
For corporate customers
- Unlimited usage
- Basic features of copainter
- Development of a dedicated model for your company (upon consultation)
※Ticket validity: 60 days for all plans.
※Ticket allocation timing: Tickets are provided monthly on the same day as your plan registration date for all plans.
※The Free plan can be used free of charge every month.
※For paid plans, the contract automatically renews unless you stop the automatic renewal.
※Paid plans can be cancelled at any time. If you cancel before the renewal date, the next debit will not occur.
※If you cancel a paid plan, you cannot re-register for the same plan until its term ends.
※Even after changing or canceling a plan, tickets can still be used if they remain within their validity period.
※You can upgrade, downgrade, or cancel at any time during the month.
※Prices include tax.
FAQ About AI Illustration Generation
AI Illustration & Useful Info
About AI Illustration Generation
AI illustration generation uses the latest deep learning technology to create images. Compared to traditional manual creation, it drastically speeds up idea realization and enhances creative output. Incorporating this tech into your workflow shortens production time significantly, allowing more focus on creativity and fine-tuning. AI suggestions can also inspire new forms of expression and improve originality and quality.
Comparison with Traditional Production Processes
Traditional workflows required significant time and effort at every stage—from sketch to completion. With tools like Copainter, automatic inking and efficient coloring processes dramatically reduce production time, letting creators devote more time to creative tasks.
Features and Selection Criteria for AI Tools
Key criteria for choosing AI illustration tools include output quality, ease of use, and pricing. Especially for output quality, evaluate technical aspects such as line accuracy, naturalness of coloring, and resolution. Intuitive UI, rich features, and solid support are also important for long-term use.
Benefits and Challenges in Business Use
In business, AI illustration tools offer clear benefits such as reduced labor costs and consistent quality. However, challenges like onboarding and workflow restructuring must be addressed. For large organizations, a phased approach to integration is recommended.
Rights and Considerations for Commercial Use
When using AI illustration tools commercially, it's essential to understand copyright and terms of use. Generated images must comply with each service’s terms. Avoid mimicking others’ works or generating inappropriate content. Also, ensure quality control and consistent expression across outputs.
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Operating Company
Since its founding in 2015, Radius5 Inc. has been a pioneer in the creative AI field. From around 2018, we began developing AI support tools for creators and have been offering 'copainter,' a tool specializing in illustration and manga production.
Company Name：Radius5 Inc.
Representative：Daisuke Urushibara
Capital：10 million yen
Established：September 2015
Location：1-29-1 Takadanobaba, Shinjuku-ku, Tokyo
Business Description：Providing web services related to creative activities