ポスターと文字

FLUX 3 YouTube thumbnail prompt

A thumbnail-background brief for FLUX 3 built around hard light, reserved title space and detail that survives being shrunk.

公開日 August 21, 2026

プレビュー

レンダリング済みの作例はまだ公開していません

掲載するのは、ページに載っているプロンプトから実際に生成した画像だけです。この作例をレンダリングして確認するまでは、ブリーフそのものが展示物です。

プロンプト全文

¹High-impact video thumbnail background for a workshop about restoring old cameras. A single disassembled rangefinder camera on a dark walnut bench, ²body left of centre, lens elements and springs laid out in a neat row beside it. ³Hard directional key light from the upper right creating strong edge definition, ⁴deep shadows kept open enough to read on a phone, ⁵one saturated cyan practical glowing behind the bench for separation. Very high local contrast, punchy but not clipped, ⁶subject occupying the left 60 percent with the right side deliberately simple for a title overlay. Clean composition, no clutter, ⁷no small details that vanish at thumbnail size. ⁸No text, no arrows, no faces, no logos, no watermark.

このプロンプトを使う

プロンプトとアスペクト比を入力済みの状態でジェネレーターを開きます。

プロンプトは英語のまま掲載しています。そのままジェネレーターに貼り付けられますし、書き換えるときも英語のままにしておくことをおすすめします。

プロンプトの構造

以下の語句は、上のプロンプトにそのままの形で現れ、それぞれがひとつの要素を決めています。組み合わせを変え、置き換え、削りながら、自分用の版を作ってください。

01
High-impact video thumbnail background
Background is the operative word. The thumbnail is finished in a design tool, so what you want from the generator is the plate underneath it.
02
body left of centre, lens elements and springs laid out in a neat row
Thumbnails are read in under a second. One subject with one obvious arrangement beats a rich scene every time.
03
Hard directional key light from the upper right creating strong edge definition
Soft light disappears at small sizes. Hard light gives edges that survive being 320 pixels wide in a feed.
04
deep shadows kept open enough to read on a phone
A constraint tied to the actual viewing device. Crushed blacks look great on a monitor and turn into a smudge on a phone in daylight.
05
one saturated cyan practical glowing behind the bench for separation
A colour accent that also does a structural job — it separates the subject from the background instead of merely decorating.
06
subject occupying the left 60 percent with the right side deliberately simple
Reserve the title space in the image rather than covering good pixels with a text box later.
07
no small details that vanish at thumbnail size
A direct instruction about the delivery size. Detail that cannot survive the crop is worse than no detail — it becomes noise.
08
No text, no arrows, no faces, no logos
Generated arrows and text in thumbnails look like clip art. Add those in the editor where you control them.

このプロンプトについての質問

Should I generate the thumbnail text as well?

No. Thumbnail text needs a specific typeface, a specific size and often a stroke or shadow to stay legible. Generate the background and set the type in a design tool.

Why does the prompt avoid faces?

Faces are the strongest element in any thumbnail, so most creators composite their own. If you do want a face, use the portrait or headshot brief and combine the two images.

How do I check it will work at small size?

Shrink the result to about 320 pixels wide and look at it on a phone. If the subject is still instantly readable and the right side is still clean, it works.

リリース状況のメールを 1 通受け取る

メールアドレスをご記入ください。FLUX 3 がここで使えるようになったら、簡潔なお知らせを 1 通お送りします。