Nano Banana Prompts for DTF Printing
Eighteen copy-and-paste prompts and checks for Google’s Nano Banana image models. They cover the master prompt, templates, client edits, fixes for drifting output, and the aspect ratio, pixel and preflight rules that decide whether the file prints clean.
- 1 Pick a prompt
- 2 Replace the brackets with your design
- 3 Paste it into the Gemini app or Google AI Studio
All prompts
18 of 18NB-01Master prompt
The base block for every new design. Swap the creative parts, keep the print constraintsPrompt Templates
Structure that holds up for DTF: action, subject, composition, style, print constraints, aspect ratio, output specs, exclusions. The print constraints line is the part that matters, so leave it alone and change the rest.
Create a high-resolution DTF print graphic for apparel. Subject: [describe the hero subject clearly]. Composition: [layout, framing, text placement, subject scale]. Style: [visual style, line quality, color palette, mood]. Print constraints: bold silhouette, crisp hard edges, thick outlines, flat solid colors, high contrast, isolated cutout design, readable from distance, minimal tiny details. Aspect ratio: [1:1, 4:5, 9:16, 16:9, 1:4 or 1:8 depending on placement]. Output specs: [resolution target], centered composition. Exclude: t-shirt mockup, person wearing it, room or outdoor background, drop shadows, glow, blur, fog, soft transparency, semi-transparent smoke, unnecessary scene props.
When a design keeps drifting, split the same content into stacked lines instead of one paragraph. Separated instructions get followed more reliably.
Create a DTF print graphic. Primary goal: bold full-back streetwear graphic. Main subject: cyber samurai tiger with broken helmet and sword. Layout: centered vertical composition, large subject, top Japanese-style headline, bottom small seal icon. Style: heavy poster illustration, thick linework, flat solid colors, controlled red-black-cream palette. Print behavior: crisp hard edges, isolated cutout silhouette, no background scene, no tiny details. Aspect ratio: 4:5 or 9:16 for a tall back placement. Output: 4K. Exclude: t-shirt mockup, person, transparent effects, glow haze, blur, gradients.
NB-02Mascot graphic
Chest-print mascot with a strong silhouette that reads from across the roomPrompt Templates
Sports-style mascots print well because they are built from thick outlines and flat fills. Keep the head dominant and the accessories few.
Create a high-resolution DTF print graphic. Subject: a fierce [animal] mascot with [signature accessories]. Composition: centered chest-print layout, subject filling most of the frame, optional small accent shapes around the head. Style: bold vector sports illustration, thick black outlines, flat solid colors, high contrast, aggressive expression. Print constraints: clean cutout silhouette, crisp hard edges, strong silhouette, readable from distance, minimal tiny detail, isolated on white background. Aspect ratio: 1:1 for left chest or standard chest, 4:5 for larger front placement. Output specs: high resolution. Exclude: mockup, person, stadium background, smoke haze, glow, motion blur, soft shadows.
A filled-in version, for reference:
Create a high-resolution DTF print graphic. Subject: a majestic eagle with wings spread wide, clutching a wrench in its talons. Composition: centered badge-style layout with the eagle dominating the frame and a small banner below for optional text. Style: American traditional tattoo poster art, bold black outlines, flat saturated red, blue, cream and gray tones, high contrast. Print constraints: crisp hard edges, isolated cutout graphic, strong silhouette, solid fills, no tiny feather detail, readable from distance. Aspect ratio: 4:5 for a full-front or large chest placement. Output specs: high resolution. Exclude: mockup, person, sky background, smoke, glow, motion blur, semi-transparent effects.
NB-03Full-back streetwear illustration
Tall layout with a dominant subject and a headline and badge lockupPrompt Templates
Back prints are where the pixel count bites. Lock the composition at a lower size first, then regenerate in the final ratio once the client approves.
Create a full-back DTF transfer design. Subject: [main character or object]. Composition: tall vertical layout with dominant central subject, headline text at the top, supporting text or badge at the bottom. Style: streetwear poster art, thick outlines, bold shapes, limited but vibrant palette, layered graphic accents. Print constraints: isolated cutout graphic, solid fills, crisp contours, high legibility, 4K. Aspect ratio: 4:5 or 9:16 for full-back placement. Exclude: t-shirt mockup, person wearing it, city background, lens blur, glow haze, transparent particles.
A filled-in version with text:
Create a full-back DTF transfer design. Subject: a skull wearing a racing helmet with cracked visor and crossed pistons behind it, flat solid-color flames. Composition: tall vertical poster layout, top headline reading DRIFT CULT, bottom text reading NO BRAKES CLUB. Style: bold motorsport merch art, thick outlines, flat solid colors, aggressive composition, high contrast black, off-white, orange and red palette. Print constraints: crisp readable text, hard edges, isolated cutout design, no fragile linework, 4K. Aspect ratio: 4:5 or 9:16 for full-back placement. Exclude: t-shirt mockup, person wearing it, race track background, lens effects, glow haze, transparent flames.
NB-04Typography-driven design
Slogan and badge designs where the lettering is the graphicPrompt Templates
Treat text as a layout problem first and a styling problem second. Keep headlines short, name a font category rather than a mood, and separate main and secondary text.
Create a typography-first DTF print design. Main text: [headline]. Secondary text: [subheadline]. Composition: large dominant headline, supporting text below, compact badge-style layout. Style: bold collegiate / racing / metal / retro script typography, strong stroke outline, flat ink-friendly colors. Print constraints: very clear readable lettering, crisp edges, print-safe spacing, simple graphic accents only, isolated on white. Aspect ratio: 1:1 for badge layouts, 4:5 for stacked poster layouts, 16:9 for wide horizontal layouts. Output specs: high resolution. Exclude: decorative background scenes, thin line flourishes, glow, blur, transparent overlays.
A filled-in version:
Create a typography-led DTF design. Main text: MIDNIGHT GARAGE. Secondary text: TOKYO DIVISION. Composition: main text arched above a stylized turbo icon, secondary text in a small rectangle below. Style: motorsport badge design, flat black, cream and red palette, thick stroke outlines. Print constraints: crisp highly readable lettering, strong spacing, isolated cutout graphic, no background. Aspect ratio: 4:5 for a vertical shirt design or 1:1 for a centered badge version. Exclude: mockup, scenery, glow, soft lighting effects.
NB-05Vintage badge emblem
Symmetrical badge with ribbons, built for easy background removalPrompt Templates
Badge layouts separate cleanly because the outer edge is a simple shape. Distressed looks are the risk: they create semi-transparent texture at the edges, so the template asks for the halftone feel only where the edges stay crisp.
Create a clean vintage emblem for DTF printing. Subject: [tool, vehicle, animal, icon]. Composition: circular or shield badge, balanced symmetrical layout, integrated text ribbons. Style: retro screen-print aesthetic, bold outlines, flat aged color palette, subtle halftone look only if edges stay crisp. Print constraints: strong silhouette, easy background removal, no distressed transparency, isolated graphic, high contrast. Aspect ratio: 1:1. Exclude: mockup, realistic scenery, soft gradients, fog, reflective glare.
NB-06Kids graphic
Rounded, readable characters for youth fronts and chest printsPrompt Templates
Kawaii-style characters work because the shapes are simple and the outlines are heavy. Avoid fuzzy textures and sparkle effects, since both turn into semi-transparent edge pixels.
Create a kid-friendly DTF apparel graphic. Subject: [cute character] doing [simple action]. Composition: centered playful composition with large character and a few simple floating accent icons. Style: kawaii cartoon, clean rounded outlines, flat cheerful colors, high contrast, simple shapes. Print constraints: very readable silhouette, no tiny details, isolated on white, crisp edges, print-safe design. Aspect ratio: 1:1 for chest prints or 4:5 for youth front prints. Output specs: high resolution. Exclude: messy background, photorealism, fuzzy textures, transparent sparkles, blur.
NB-07Client revision edits
Change one thing and keep the approved compositionEdits & Text
Use these in the same chat as the approved image. Keep the base prompt intact and change one variable at a time: palette, text, expression, accents or art style. “Make it better” and “more premium” give the model nothing to act on.
Keep the composition identical, replace the red palette with black, cream, and vintage gold.
Keep the mascot identical, change the expression from aggressive to playful.
Keep all text placement identical, increase stroke thickness for better print readability.
Remove all background elements and convert this into a pure cutout sticker-style graphic.
Simplify the lower details so the design reads better at 11 inches wide.
NB-08Text localization
Translate the words on an approved design without touching the layoutEdits & Text
Build the English design first and lock the layout and style. Then translate the text only, and tell the model to preserve everything else.
Keep the entire design identical. Translate all visible text from English to [language]. Preserve the font style, stroke weight, letter placement, line breaks, and overall composition.
NB-09Dark and light garment constraints
Tell the model what fabric the transfer lands onEdits & Text
The model doesn’t know the garment color unless you say so. On dark garments, thin outlines and pale colors that rely on the shirt for contrast disappear, even with a full white underbase. On light garments, any transparent area shows the fabric. Append the matching line to the print constraints.
Print constraints: high contrast, bold fills, no design elements dependent on garment color, fully self-contained design suitable for dark fabric underbase.
Print constraints: no transparent fill areas, solid fills throughout, suitable for white or light fabric where transparent areas will show fabric color.
NB-10Character consistency across a collection
Reuse one mascot in several designs without it changing faceEdits & Text
Approve one mascot identity first and write down the exact prompt wording that produced it. Reuse that description word for word in every design, say that the identity stays consistent, and change pose, prop, emotion or scene one at a time.
Keep the character identity consistent with the previous design: [exact character description from the approved prompt]. Change only the pose to [new pose]. Keep the style, outlines, palette and print constraints identical.
NB-11It keeps making mockups
Shirt, tee or model language in the prompt pulls the model into a photoFixing Output
The cause is usually the words shirt, tee, apparel mockup, fashion shoot or model somewhere in the prompt. Take them out of the creative lines and add this.
Create an isolated cutout DTF graphic only. No t-shirt mockup. No person. No garment photo. No lifestyle scene.
NB-12Dirty edges
Soft effects and painterly styling put semi-transparent pixels on the outlineFixing Output
Fog, glow, smoke and watercolor-style rendering all create soft edges. Those become the pale fringe on fabric.
Use crisp hard edges, thick outlines, solid fills, clean cutout silhouette, no fog, no glow, no transparent smoke.
NB-13Decorative but unreadable text
Too much style, not enough typography instructionFixing Output
If the lettering looks good and reads badly, the prompt described a mood and not a layout. Name the case, the stroke and the structure.
Use large clear all-caps lettering, bold outline stroke, high spacing clarity, simple readable badge layout.
NB-14Too busy for a shirt
One hero subject and two or three accents is the ceilingFixing Output
A prompt that asks for too many symbols or environment details gives you a poster. Cut it back until it reads at thumbnail size.
Simplify the composition. Keep one dominant hero subject and only two to three supporting accent elements.
NB-15A metallic look that actually prints
Flat gray bands in place of chromeFixing Output
Chrome, mirror metallics, holographic effects and glitter sit outside the CMYK plus white gamut and flatten or shift on press. A client who wants metal gets a convincing look from flat fills.
Render the metal parts as a silver-toned illustration using light gray, mid gray and dark gray flat fills with thick outlines. No chrome, no mirror reflections, no gradients, no glitter or foil texture.
NB-16Aspect ratio and size by placement
Match the ratio to the garment area before you generateProduction
The Flash models support multiple aspect ratios and output sizes up to 4K, so one prompt can usually move between placements with only the layout line changed. Iterate small, finalize large, and only after the composition is approved.
| Placement | Aspect ratio | Final target |
|---|---|---|
| Left chest | 1:1 | 1K to 2K |
| Center chest | 1:1 or 4:5 | 2K to 4K |
| Full front | 4:5 or 3:4 | 4K |
| Full back | 4:5 or 9:16 | 4K |
| Sleeve or leg | 1:4 or 1:8 | 2K to 4K |
| Wide chest graphic | 16:9 or 5:4 | 2K to 4K |
NB-17Pixel math and upscaling
4K on screen is not 300 DPI at print sizeProduction
DTF needs 300 DPI at final dimensions. Multiply the print size in inches by 300. A 16:9 image at 4K is about 3840 × 2160 px, and a 1:1 image at 4K is 3840 × 3840 px, enough for about 12.8 in at 300 DPI without upscaling.
| Print size (in) | Pixels at 300 DPI |
|---|---|
| 3 × 3 left chest | 900 × 900 |
| 5 × 5 center chest | 1500 × 1500 |
| 10 × 10 standard chest | 3000 × 3000 |
| 12 × 12 large chest | 3600 × 3600 |
| 12 × 15 full front | 3600 × 4500 |
| 14 × 16 full front | 4200 × 4800 |
| 12 × 16 full back | 3600 × 4800 |
| 14 × 18 large back | 4200 × 5400 |
| 3 × 11 sleeve | 900 × 3300 |
Upscale only after the design is approved and the composition is locked. Upscaling a rejected concept wastes time and money. To check an existing file against its print size, use the DPI checker. Tools for this step:
- Let’s Enhance for AI upscaling that keeps edges sharp. Smart Enhance mode.
- Vectorizer AI to convert flat, badge-style artwork to vector paths, which scales without pixel artifacts.
- Pixian.ai for background removal.
NB-18Preflight checklist before the RIP
Run it on every file, including the ones that look fineProduction
Composition and type
- Outer edge is clean and easy to isolate, with no scene background left over
- Composition matches the garment placement
- Shrink it to thumbnail size: large elements still read, small details haven’t collapsed
- All text proofread character by character and readable at 100% zoom
- Stroke weight is heavy enough to survive powder application
File
- PNG with a true alpha channel, not a white fill. Open it in Photoshop or Affinity and confirm the checkerboard
- 300 DPI at final print dimensions, verified against the pixel table
- Thinnest line is at least 0.5 pt at print size. Zoom to 300% and check
Print behavior
- No effects that depend on transparency (glow, fog, soft-edged fire)
- No gradients that fade to transparent. DTF can’t print a fade to nothing, so it prints as a hard edge or a halo
- No neon or metallic values that will shift on press
- White underbase requirements confirmed for the garment color
- Tested at actual print size on screen before final approval
No prompts match that search. Clear the search box or pick All.
What these prompts are for
A DTF file rarely fails because the model couldn’t draw something good. It fails at the edges, in the color conversion, or in the pixel count. These prompts are mostly about handling those three things before the file reaches the RIP, with the creative part left to you.
Nano Banana is Google’s nickname for its Gemini image models. Nano Banana 2 is Gemini 3.1 Flash Image, the fast general-purpose model, and Nano Banana 2.1 is Google’s stable update to it. Nano Banana Pro (Gemini 3 Pro Image) is the higher-fidelity option. Google lists text rendering, subject consistency and output sizes up to 4K for the Flash models. The prompts on this page work on all of them. Model names change often, so check what the Gemini app or Google AI Studio offers today.
Designs that print well behave like vector stickers, screen print separations or tattoo flash, not soft editorial photography. That means thick silhouettes, solid or mostly solid color regions, high contrast between layers, no semi-transparent haze at the edges, text large enough to stay crisp, and shapes that still read at arm’s length.
The halo problem explains most of the print constraints above. Every generator renders edges with anti-aliasing, a blend between the shape and its background. Those blended pixels are semi-transparent. On the film, white ink prints over the CMYK, so after transfer it sits behind the color, and the RIP puts it behind those semi-transparent pixels too. On fabric they show as a pale fringe that wasn’t in your preview. Prompting for vector-style rendering, thick outlines, hard edges and flat fills produces fewer of them.
A workflow that wastes the least money: generate 6 to 12 rough options at low resolution, pick two, add the print constraints and the placement ratio, show the client 2 to 4 clean variants, freeze the composition after approval, then regenerate in the final ratio, remove the background and upscale once. Every file from these prompts is a concept file until it has been through the preflight list in NB-18.
Where it goes wrong
Edges and halo
Prompting reduces anti-aliased edge pixels. It doesn’t remove them. Remove the background, zoom to 300% and look at the outline before you trust the file. Gradients that fade to transparent print as a hard edge or a halo, because DTF can’t print a fade to nothing.
Color gamut
The model outputs RGB and your RIP converts to CMYK plus white. Neon green, electric lime, fluorescent orange, hot pink, chrome, holographic effects and glitter sit outside that gamut and shift or flatten on press. Flat, saturated, real-world ink colors are safer and more predictable.
Resolution
A 4K output is screen resolution, not 300 DPI at print size. A 12 × 16 in back print needs 3600 × 4800 px, so most placements need an upscale before they enter the RIP or a gang sheet. The DPI checker does the math for any size.
Lettering
Text rendering has improved a lot but still fails often enough to matter, especially with long copy and small type. Keep headlines short and proofread every character. A wrong letter on a production run is your cost.
Flash or Pro
Use the Flash models for iteration, client approvals and most final artwork. Reach for Nano Banana Pro only once a design is approved and the final output needs the highest fidelity.
Frequently asked questions
Which Nano Banana model should I use for DTF artwork?
Use the current Nano Banana Flash model for concepting, iteration and most final artwork. That is Nano Banana 2 (Gemini 3.1 Flash Image) or its 2.1 update, which offer text rendering, subject consistency and output up to 4K. Consider Nano Banana Pro only for an already approved design that needs the highest fidelity.
Why do AI-generated DTF designs show a halo on the garment?
Anti-aliased edge pixels are semi-transparent, and the RIP puts white ink behind them. On fabric they show up as a pale fringe. Prompting for hard edges, thick outlines and flat fills produces fewer blended edge pixels, so there is less halo to clean up.
Can I use neon or chrome colors in DTF artwork from Nano Banana?
Not reliably. The model outputs RGB, and DTF RIP software converts to CMYK plus white. Neon, fluorescent, chrome and holographic values fall outside that gamut and shift or flatten. Prompt for flat saturated colors, or flat gray bands to imitate metallic.
What resolution does a DTF file need?
300 DPI at final print size. Multiply the print size in inches by 300. A 12 by 16 inch back print needs 3600 by 4800 pixels. Upscale after the design is approved, not during concepting.
DTF Printing Profit Blueprint
Good artwork still has to clear your cost per transfer. 122 pages and 8 Excel templates for DTF pricing and costing. Building gang sheets from approved artwork? DTF Toolbox is Kjell’s own product: dtftoolbox.com.
Written by Kjell Karlsson, founder of Printing TLDR. 30+ years in large format printing, 10+ in DTF. No vendor affiliations, no sponsored placements.
Last reviewed: October 2026 · Reviewed by Kjell Karlsson, Printing TLDR