How pocket photo printers work

1. ZINK — zero ink

ZINK paper has three layers of dye crystals embedded in it, each of which turns a different color when heated to a specific temperature for a specific duration. Before printing the crystals are colorless, so the paper looks like blank glossy stock.

The printer has no ink, no ribbon and no cartridge. It has a thermal head that applies precisely controlled heat pulses, and the image forms inside the paper. The print emerges dry and finished, usually with a peel-off adhesive backing.

• •Pros: cheapest hardware, nothing to replace but paper, peel-and-stick, instant and dry.
• •Cons: narrowest color range of the three, least fade-resistant, and the characteristic slightly flat look.
• •Cost: about 60 cents a print — Canon's 2 x 3 ZINK paper was $11.99 for 20 sheets.
• •Found in: Canon IVY 2 Mini, HP Sprocket, and most budget pocket printers.

2. Dye sublimation — the quality option

A dye-sublimation printer holds a ribbon carrying panels of dye. Heat turns the dye directly from solid to gas, which penetrates the paper's surface and solidifies there — so the color is in the coating rather than sitting on top of it.

Kodak calls its version 4PASS: three passes for yellow, magenta and cyan, then a fourth pass that lays down a clear laminate. That fourth pass is why these prints come out dry, do not smudge, and resist water and handling. Canon's SELPHY applies a comparable protective overcoat and claims up to 100 years of fade resistance.

• •Pros: best color accuracy, most durable print, water resistant, and the cheapest per print.
• •Cons: needs an all-in-one cartridge, and the printer costs more.
• •Cost: from about 39 cents (Canon 4 x 6) and 42 cents (Kodak 4PASS) to about 85 cents (Polaroid Hi-Print).
• •Found in: Kodak Mini and Mini Shot series, Canon SELPHY, Polaroid Hi-Print.

3. Instant film — a camera without a lens

An instax printer is essentially an instax camera with an LED array where the lens would be. It exposes a sheet of real instax film line by line with red, green and blue light, then ejects it through the same rollers that burst the chemical pod. The print develops in your hand over about ninety seconds, exactly as it would from a camera.

So the print is not an imitation of an instant photograph — it is one, with the same white border, the same rendering and the same behavior over time.

• •Pros: a genuine instant-film print, film available in supermarkets, and the look nothing else reproduces.
• •Cons: most expensive per print, fades in direct sunlight, and the smallest print per dollar.
• •Cost: about 85 cents (instax mini) to $1.10 (instax WIDE) a shot.
• •Found in: instax mini Link 3, instax Link WIDE 2, and the instax mini Evo's print function.

All three, compared

Every verified cost, in one place

Which technology to choose

• •Best print, lowest cost: dye-sublimation. It wins on both, which is unusual.
• •Stickers: ZINK. The only one that peels off.
• •The instant-film look: instax. The only one that actually is instant film.
• •Prints going on a sunny wall: dye-sublimation, for the laminate layer.
• •Media you can buy in a supermarket at 9pm: instax mini film, and nothing else here.

1. Best dye-sublimation pick

Kodak Mini 2 Retro

Four passes plus a laminate seal, at about 42 cents a print.

Buy it for

Anyone who wants the most durable, most accurate print for the least money.

Skip it if

Anyone who wants stickers or the instant-film look.

• •4PASS: three color passes plus a clear laminate, which is why the print is dry and smudge-proof.
• •About 42 cents a print at 291 x 300 dpi.
• •All-in-one cartridge, so ribbon and paper run out together.

Running cost: Kodak 4PASS 2.1 x 3.4 works out at $0.42 a shot, so a hundred photographs in the first year puts the real total at about $139.97 including the camera. See every format’s cost.

How it scores8.7/10 overall

• Print durability9
• Color accuracy8
• Cost per print10

Our editorial scoring, built from published specifications and reviews by outlets that test hardware — see how we pick. We have not handled these products, so these are not test results.

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2. Best ZINK pick

Canon IVY 2 Mini

No ink at all — the color is in the paper, and the print peels off as a sticker.

Buy it for

Anyone who wants stickers and the smallest possible printer.

Skip it if

Color-critical work, or prints going somewhere sunny.

• •Nothing to replace but paper, because there is no cartridge at all.
• •About 60 cents a print, about 50 seconds each.
• •314 x 500 dpi on peel-and-stick 2 x 3 paper.

Running cost: ZINK 2 x 3 works out at $0.60 a shot, so a hundred photographs in the first year puts the real total at about $189.94 including the camera. See every format’s cost.

How it scores7.6/10 overall

• Print durability5
• Color accuracy5
• Cost per print8

Our editorial scoring, built from published specifications and reviews by outlets that test hardware — see how we pick. We have not handled these products, so these are not test results.

Digital Camera World, which publishes hands-on reviews, calls it “working out at around 60c per print”.

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3. Best instant-film pick

Fujifilm instax mini Link 3

An LED array exposes real instax film, exactly as light does in a camera.

Buy it for

Anyone who wants a genuine instant print from a phone.

Skip it if

Volume printing at 85 cents a shot.

• •Real instax mini film at 318 dpi, developing in about 90 seconds after a 15-second print cycle.
• •The only technology here that produces an actual instant-film print.
• •Film available in supermarkets, unlike every cartridge-based system.

Running cost: instax mini works out at $0.85 a shot, so a hundred photographs in the first year puts the real total at about $201.94 including the camera. See every format’s cost.

How it scores8.0/10 overall

• Print durability5
• Color accuracy7
• Cost per print6

Our editorial scoring, built from published specifications and reviews by outlets that test hardware — see how we pick. We have not handled these products, so these are not test results.

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Read the full review