提示词库 · 书籍封面
十个按类型分类的实测封面艺术提示词——惊悚、纯文学小说、温馨推理、太空歌剧、自我成长类——每一张都特意为你自行排版的文字留出清晰空间。未经修饰的输出结果，每张卡片都标注模型和价格。
要生成的是艺术图，而不是成品封面。如果你要求模型生成「一个书名为Silent Harbour的书籍封面」，得到的会是一个看似像模像样、实则字母错位的封面——重复的字母、幽灵般的衬线、任何设计师都不会接受的间距。正确做法是：只提示画面本身，并预留空间——「阴郁的纯文学封面艺术图，黎明时分一艘孤舟漂浮在灰色平静的湖面上，水面有薄雾，色调低沉，画面上三分之一处留有大片空白天空用于排版文字，不要出现任何文字或字母」。然后再用真实字体把书名叠加上去。
类型是提示词的另一半，它对应的是一种设计语言，而非某个具体主体。惊悚小说高对比、冷色调、偏心构图，配一处血红色暖色点缀。纯文学小说安静、有质感、富有象征意味，常常只呈现单一物件。爱情小说明亮、高调、圆润。科幻小说讲究尺度和剪影。把类型和处理手法直接说出来——「当代惊悚小说封面艺术，高对比度，冷色调，单一暖色点缀」——构图自然就会到位。以下十张全部是在BananaBanana上生成的未经修饰的首次输出。
纸质书封面通常接近2:3——6×9英寸的平装书正好是这个比例——电子书平台的比例也很接近，同一张图基本通用。这里的提示词按3:4生成（这是模型提供的最接近的比例），之后在排版工具中精确裁剪到成品尺寸。正因如此，生成时要求画面边缘留一点余量：构图顶满画框的图，裁剪到2:3并加上书脊出血位后，主体很容易被切掉。
在缩略图尺寸下，构图比分辨率更重要。封面在书店网格中首次呈现时高度往往只有150像素，所以检验标准是这张图在这个尺寸下是否依然清晰可辨。一个鲜明的剪影、一种主导色，加上一条清晰的文字留白区，缩成缩略图后依然能看清；而细节繁复的插画场景则会变成一团视觉噪点。要印刷时按2K生成，并在敲定之前把每个候选图缩小检查一遍。
下面每张图片都是所在卡片提示词的未修输出——没有从几十次尝试里挑好的，也没有修图。模型徽标标明了它由什么生成、花了多少钱。
Contemporary thriller cover artwork: a single small rowing boat adrift on a flat, glassy grey lake at dawn, heavy mist swallowing the far shore, one thin band of cold orange on the horizon. High contrast, desaturated palette of slate, charcoal and one warm accent. Large empty sky occupying the upper third for typography. Cinematic, ominous, no text or lettering.
Quiet literary fiction cover artwork: a single wooden chair standing in an empty room with a bare floorboard and a slanted rectangle of afternoon light falling across it. Muted palette of dust, ochre and pale blue, visible paper grain and painterly texture, generous empty wall space above the chair for typography. Restrained and symbolic, no text or lettering.
Space opera cover artwork: an enormous ringed planet filling the lower half of the frame, a tiny silhouetted ship crossing in front of it leaving a thin ion trail, star field and faint nebula above. Deep indigo and violet palette with one cyan accent, strong silhouette that reads at thumbnail size, clear dark sky in the upper third for typography. Epic scale, no text or lettering.
Cozy mystery cover illustration: a narrow cobbled village lane with crooked shopfronts, window boxes of flowers, a bicycle leaning against a wall and a black cat sitting in a doorway. Warm inviting palette of butter yellow, sage and dusty rose, flat charming illustration style with clean shapes. Sky and rooftops left open at the top for typography, no signage, no text or lettering.
Contemporary romance cover illustration: two figures seen from behind at a distance, walking apart along a sunlit shoreline, their long shadows almost touching. Bright high-key palette of coral, cream and sky blue, soft flat illustration with rounded shapes and simple faceless figures. Wide empty sky in the upper half for typography, optimistic and warm, no text or lettering.
Historical fiction cover artwork: a tall wooden sailing ship at anchor in a misty harbour at first light, rigging silhouetted against a pale sky, small figures on the quay in period coats. Painterly oil-on-canvas texture, muted palette of sea green, sand and warm grey. Sky open across the top third for typography, atmospheric and evocative, no text or lettering.
Modern non-fiction cover artwork: a clean abstract composition of connected circles and lines forming an ordered network across the lower two-thirds, one node highlighted in a bright accent. Flat vector style, generous negative space, limited palette of deep navy, off-white and one signal orange. Whole upper third left empty for typography, confident and intellectual, no text or lettering.
Psychological horror cover artwork: a long empty corridor of an old building receding into darkness, peeling wallpaper, a single bare bulb throwing a weak cone of light halfway down, one door ajar with blackness behind it. Nearly monochrome palette of sickly green-grey with deep crushed blacks, heavy vignette, film grain. Dark ceiling space at the top for typography, no text or lettering.
Memoir cover artwork: a person seen from behind, silhouetted at a rain-streaked window, one hand resting on the glass, warm interior lamplight behind them and a blurred city beyond. Painterly and intimate, muted palette of amber, deep blue and grey, face not visible. Clear darker area across the top for typography, reflective and personal, no text or lettering.
Children's picture book cover illustration: a small fox and an owl sitting together on a mossy log in a friendly stylised forest, oversized mushrooms and round trees, fireflies drifting in the air. Warm storybook palette of moss green, pumpkin and cream, soft gouache texture, gentle rounded shapes. Open sky at the top for typography, cheerful and welcoming, no text or lettering.
「画面上三分之一处留有大片空白天空用于排版文字」能让模型围绕书名构图，而不是把每一个像素都填满。这就是「可以在上面设计」和「必须跟画面较劲」之间的区别。
AI生成的文字几乎每次都会有细微错误，而在封面上这是致命的。用真实字体把文字叠加在图上——你能获得正确的字距，改副标题也只需五秒钟编辑，而不必重新生成整张图。
「高对比度、冷色调、一处暖色点缀、偏心主体」才是让惊悚小说看起来像惊悚小说的关键。类型不是一个主体，而是一种处理手法——把处理手法说出来。
选定之前，把每个候选图缩小到150像素高来看。一个剪影配一种主导色依然清晰；一个繁复的插画场景放进书店网格里会糊成一团。
可以——你在BananaBanana上生成的图片版权归你所有，AI封面艺术在自出版领域已被广泛使用。Amazon KDP及大多数其他平台要求在上传时如实披露内容是否由AI生成，如实回答即可，这并不会阻止发布。
印刷用途请在Nano Banana 2或Pro上按2K生成。300dpi下6×9英寸的封面是1800×2700像素，2K输出足够裁剪到成品尺寸并加出血位。仅用于电子书或概念测试时，Lite的1K画质就够用。
在任意排版工具中完成即可——Affinity Publisher、InDesign、Canva，甚至Figma。把生成的图作为背景，在提示词预留的空白区域设置书名文字，再导出为PDF或按平台要求尺寸导出的扁平图片。
一次生成很难可靠做到——模型并不理解书脊作为结构元素的含义。请先生成封面正面图，再通过编辑操作向两侧延展，或在排版工具中拼合整个包裹面，封底尽量保持纯色以确保文案清晰可读。
如果你用和大家一样的方式写提示词，就会撞车。类型惯例只是起点，不是终点——选一个不寻常的物件、一种出人意料的色调，或一个别致的构图角度，同时保留该类型固有的对比与构图规则。这里的提示词正是为这种替换而写的模板。
