Travel posters are one of the most heavily constrained design genres there is, which is exactly why they are so easy to get almost right and so hard to get right. The conventions come from a printing process nobody uses any more, and they survive because that process produced something people still want to hang.
If you are generating this work with AI, the constraints matter more, not less. A model will hand you atmosphere, depth and subtle gradation by default, because it learned from photographs. The genre is built on the refusal of all three.
The colour limit is the whole style
Between four and six flat colours, counting the paper.
That number is not an aesthetic preference. The originals were screen printed, and every colour meant another screen, another pass and another cost. Designers worked within four or five because five was what the budget allowed, and the discipline produced the flat confident shapes the genre is known for — a mountain rendered as three tones rather than three hundred, because three was all there was.
This is why an AI travel poster so often looks subtly wrong even when it is beautiful. It has forty colours and soft transitions between them. The eye reads the absence of the constraint without being able to name it, and the image lands as a digital painting with poster lettering attached.
Practical version: after generating, posterise the artwork down to a small palette and see whether it survives. If it falls apart, the composition was relying on gradation rather than shape, and it was never really a travel poster.
Flat shapes, hard edges, no atmosphere
The genre renders form through shape, not through light.
A mountain is a silhouette with two or three tonal bands, and the bands have hard edges. Water is flat colour with a few carved highlights. Sky is one or two flat fields, sometimes with a hard-edged sun disc. There is no haze, no bloom, no depth-of-field falloff, and no soft shadow.
Image generators produce all of those by default. When prompting, ask for the reproduction method rather than the subject's appearance — screen print, lithograph, flat colour separation, limited palette poster — and you will get closer than any amount of describing the scenery.
The typographic hierarchy is fixed
Almost every poster in the genre uses the same three-level structure, in the same order of dominance.
The place name. Heavy caps, geometric or grotesque sans, tight tracking, easily the largest element. This is the poster's single loudest word and it should be readable across a room.
A qualifier. Smaller, lighter, often letterspaced wide: the country, the region, sometimes a line like by air or the continental express. It sits close beneath the name and is optically narrower than it.
A detail line. Smallest, sometimes absent. Coordinates, a date, an airline, a railway company.
The proportions matter more than the exact sizes. The place name should be roughly three to four times the height of the qualifier. Anything closer and the hierarchy flattens; anything wider and the qualifier reads as an afterthought.
Set the place name in caps. Not because caps are inherently better, but because the genre is caps, and a lowercase place name reads as contemporary Scandinavian minimalism — a different, also profitable, but distinct market.
Where the type goes
Bottom, usually, in a band of flat colour or paper.
The historic reason is functional. These posters were read from a distance in station concourses and agency windows: the image did the attracting, the name did the confirming, and the eye travelled down. That reading order is baked into what the genre looks like.
Top placement is legitimate when the composition has a large empty sky, which coastal and desert subjects often do.
Centred over the image is the modern habit, and it is the fastest way to lose the period reading entirely. If the type sits on the artwork, it stops being a poster and becomes a quote graphic.
This is also the practical argument for generating square artwork and mounting it on a taller sheet: it gives you a clean band for the type that the image never intrudes on, and the band is identical across every poster in the range.
Composition conventions worth knowing
One subject, held large. The genre does not do busy. A single mountain, a single building, a single curve of coast, occupying most of the frame. Sweeping panoramas with six points of interest are a different tradition.
A low or very high horizon. Middle horizons are static. The originals push it into the lower third to give the sky weight, or into the upper third to let a foreground shape dominate.
Asymmetry, resolved. The subject sits off centre and something balances it — a cloud mass, a diagonal, a block of type. Perfectly centred compositions read as stock.
Depth by overlap, not by blur. Distance is shown by shapes overlapping and by tonal steps between planes, never by softening. Three or four crisp planes is the whole depth model.
Margins are paper, not a border
Frame a genuine vintage poster and the white around it is mount board. The printing went to the sheet edge.
So build your margin as flat paper colour inside the file — the artwork sits within it, and the sheet reads as one object. Do not draw a rule around the artwork. A drawn border makes the piece read as a certificate or a map reproduction rather than a poster, and it is one of the most common tells in AI-generated work.
Keep the margin even on three sides and deeper at the bottom, which is where the type lives. Equal margins all round look correct measured and wrong hung, because the eye reads the optical centre as slightly above the true one.
Getting it out of an image generator
Prompt the process, not the picture. Naming screen printing, limited palette, flat colour and mid-century poster reproduction gets you further than describing the landscape in detail.
Expect to fight three defaults: gradients, atmospheric haze, and photographic lighting. All three arrive uninvited and all three are wrong for the genre.
And generate the artwork only. Let the model make the image and set the typography yourself, in a layout you control. Models are unreliable at text, and more importantly the type is where the consistency of a range lives. Fifty posters whose place names sit in exactly the same position, at exactly the same size, in exactly the same face, read as a collection. Fifty posters where the model invented the lettering read as fifty attempts.
What separates the ones that sell
Not the artwork, usually. The artwork is the easy half now.
It is whether the poster looks like it was designed within a constraint — a limited palette, a fixed grid, a settled typographic system — or whether it looks like an image with words underneath. Buyers cannot articulate the difference and price it accurately anyway.
Frequently asked questions
How many colours should a vintage travel poster use?
Between four and six, including the paper colour. The limit is not stylistic nostalgia — it comes from the screen printing the originals were made with, where every colour meant another pass and another plate. That constraint is what produces the flat confident shapes the genre is known for. A poster using thirty subtle gradients reads as a digital painting with travel-poster lettering attached, because the eye recognises the absence of the constraint even when it cannot name it.
What typefaces suit a vintage travel poster?
Geometric and grotesque sans faces from the 1920s to 1950s, or their modern revivals — Futura, Gill Sans, Trade Gothic and similar. Set the place name in heavy caps with tight tracking as the dominant element. Avoid scripts, slabs with heavy brackets, and anything that reads as a wedding invitation. The one common mistake is using a face that is period-correct for the wrong period: a 1970s bubble face on an Art Deco composition fights itself.
Should the place name go at the top or the bottom of a travel poster?
Bottom, in most of the genre, because the historic posters were designed to be read from a distance in a station or agency window with the image doing the attracting and the name confirming it. Top placement works when the composition has a strong empty sky, which is common for coastal and desert subjects. What does not work is centring it over the image, which is a modern habit and immediately breaks the period reading.
Do vintage travel posters need a border?
A margin, yes; a drawn border, usually not. The original posters were printed to the sheet edge and the white you see around framed examples is mount board, not part of the design. If you are printing to a standard size and want breathing room, build the margin into the file as flat paper colour rather than drawing a rule around the artwork, which reads as a certificate rather than a poster.
Why do AI-generated travel posters often look wrong?
Usually three things at once: too many colours, gradients where the genre uses flat fills, and a lighting model borrowed from photography rather than print. Image generators default to depth, atmosphere and soft transitions because most of their training data is photographic. The genre relies on the opposite — flat planes, hard edges, and colour separation you could physically print. The fix is prompting for screen print and poster reproduction rather than for scenery.