# Collotype (コロタイプ)

> A photomechanical process that prints ink from a photographically prepared gelatin surface. Fine, irregular reticulation carries detail and smooth-looking tones rather than a regular halftone screen. It has reproduced photographs and artworks; it is unrelated to the collaged matrix of a collagraph.

- IndexStyle No.773 — https://indexstyle.org/styles/collotype
- Kind: Technique · Family: Planographic Printing · Era: 19th century–present
- Mood: Technique, Calm
- What this family collects: Neither method cuts into the plate, since both rely on grease repelling water, and once color was added the process put advertising and reproductions into ordinary hands.

## Brief inputs

Supply these before production. They are intentionally not invented by the style.

- Deliverable and channel: page, app screen, deck, campaign image, garment, object or space
- Subject and message: what the audience must notice or understand first
- Audience and context: where, when and at what viewing distance it will be encountered
- Format: dimensions, aspect ratio, responsive states, slide count or physical constraints
- Content hierarchy: required copy, data, actions, imagery and legal information
- Production constraints: accessibility, materials, budget, image rights and delivery deadline

## Defining characteristics

- Detailed images derived from photographs or originals
- Apparently continuous tonal changes
- Fine irregular reticulation under magnification
- Tone without a regular dot screen

## Best used for

- Exhibitions and teaching that compare Collotype with neighbouring print techniques
- Publications studying lines, tones and paper through documented works

## Composition recipe

- Typography & lettering: Keep lettering in the work separate from added labels; place medium, artist and date outside the image.
- Layout & structure: Pair details with the whole image and distinguish the microscopic pattern from overall tone.
- Material & texture: Check the collection medium record and the paper and ink; do not infer materials from screen colour alone.

## Colour

Read off the reference works below, so a direction rather than a fixed palette.

- Ground: #E1D5BF
- The colour it is remembered by: #8D8071
- Text and outlines: #403B35

## Evidence and rights boundary

- Treat the source of record and reference works below as evidence for understanding the style, not as assets to reproduce.
- The AI interpretation image, when present, is a browsing aid only. It is neither a reference work nor evidence for the definition.
- For a branded design system, translate hierarchy, spacing, colour roles and component logic into an unrelated fictional service. Do not copy logos, proprietary type, icons, product copy, screenshots or exact component geometry.
- For a regional, Indigenous or community-rooted tradition, retain place, authorship and historical context. Do not combine unrelated motifs or reduce the entry to generic ethnic decoration.
- For fashion and subculture, distinguish documentary context from a costume prompt; use fictional adults and avoid real labels, public figures and caricature.
- Record the rights status and intended use of every supplied image, typeface, logo and quotation before production.

## Translate it by medium

The rules below preserve the visual grammar without copying a historical artefact literally.

### Web and app

- Page structure: translate “Pair details with the whole image and distinguish the microscopic pattern from overall tone.” into the hero, section rhythm and information hierarchy.
- Type system: use “Keep lettering in the work separate from added labels; place medium, artist and date outside the image.” for display moments and short labels. Keep body copy, navigation, forms and status text in a highly legible companion when the display treatment reduces clarity.
- Components and imagery: carry “Check the collection medium record and the paper and ink; do not infer materials from screen colour alone.” through image treatment, borders, dividers, cards and selected surfaces; do not decorate every component equally.
- Tokens: begin with #E1D5BF as the ground, #8D8071 as the memorable colour, and #403B35 for text, outlines and high-contrast detail. Assign colours by semantic role before tuning individual components.
- Presentation: render the screen itself as the design artefact. Add a phone, browser chrome or perspective mockup only when the deliverable explicitly asks for one.
- Responsive behaviour: preserve hierarchy, alignment logic and the dominant cue when columns collapse; do not reproduce a desktop composition by merely shrinking it.
- Usability gate: keyboard focus, action labels, contrast, zoom and reduced-motion behaviour remain explicit even when the historical style did not account for them.

### Slides and decks

- Title slide: express one idea with the strongest scale, alignment or framing move from “Pair details with the whole image and distinguish the microscopic pattern from overall tone.”.
- Content slides: keep the reading layer quieter than the title layer. Use one dominant characteristic per slide and repeat the same grid, margins and type roles across the deck.
- Images and surfaces: art-direct crops, masks, rules and backgrounds with “Check the collection medium record and the paper and ink; do not infer materials from screen colour alone.” rather than adding unrelated decoration.
- Charts and diagrams: use #E1D5BF as the ground, #8D8071 as the memorable colour, and #403B35 for text, outlines and high-contrast detail; preserve labels and numerical contrast before stylistic treatment.
- Presentation: deliver a flat slide canvas by default. A photographed screen, laptop or conference room is a different deliverable and must be requested explicitly.
- Sequence: alternate emphatic slides with quiet explanatory slides so the style has rhythm instead of becoming constant noise.

### Image generation and art direction

- Subject: choose one concrete subject that serves one of the uses above; the style is the treatment, not the subject.
- Composition: build the frame from “Pair details with the whole image and distinguish the microscopic pattern from overall tone.”. Make the focal hierarchy readable before adding texture.
- Lettering and graphic marks: follow “Keep lettering in the work separate from added labels; place medium, artist and date outside the image.”. If text is not essential, omit it; if it is essential, use short neutral wording and reject illegible pseudo-text.
- Surface, light and finish: interpret “Check the collection medium record and the paper and ink; do not infer materials from screen colour alone.” as material, texture, edge quality, depth and lighting rather than as a generic filter.
- Effect discipline: gradients, bloom, glass, chrome, heavy shadows, grain and distressed paper are off by default unless the material direction names or clearly requires them.
- Cliché test: remove the most obvious period prop or motif. The style should still read through composition, type, colour relation and material behaviour.
- Set direction: make a clear establishing composition, a changed crop or viewpoint, a material/detail study, and a reduced alternate. Keep the visual grammar stable while changing the framing.
- Ready-to-run prompt: https://indexstyle.org/styles/collotype/prompt.txt

### Styling, objects and spaces

- Silhouette and proportion: translate “Pair details with the whole image and distinguish the microscopic pattern from overall tone.” into the distribution of volume, balance, symmetry or asymmetry.
- Materials and finish: start from “Check the collection medium record and the paper and ink; do not infer materials from screen colour alone.”; choose real materials whose behaviour supports the style instead of printing a motif onto an unrelated surface.
- Graphic detail: apply “Keep lettering in the work separate from added labels; place medium, artist and date outside the image.” only where lettering, labels, trims or wayfinding have a reason to exist.
- Palette: use #E1D5BF as the ground, #8D8071 as the memorable colour, and #403B35 for text, outlines and high-contrast detail. Let one role dominate, one support and one provide legibility or edge definition.
- Edit: carry two or three defining characteristics strongly. Avoid turning every characteristic into a literal prop or costume reference.

## What to avoid

A screen image may conceal the diagnostic pattern. Use the collection's medium record, and distinguish collotype from collagraph.

## Application checklist

Work through this before calling a piece an application of this style.

- [ ] The deliverable, subject, audience, format and content priority are explicit
- [ ] One characteristic is dominant and at least two others support it
- [ ] Visible in the piece: Detailed images derived from photographs or originals
- [ ] Visible in the piece: Apparently continuous tonal changes
- [ ] Visible in the piece: Fine irregular reticulation under magnification
- [ ] Visible in the piece: Tone without a regular dot screen
- [ ] The layout follows: Pair details with the whole image and distinguish the microscopic pattern from overall tone.
- [ ] The lettering follows: Keep lettering in the work separate from added labels; place medium, artist and date outside the image.
- [ ] The material and surface follow: Check the collection medium record and the paper and ink; do not infer materials from screen colour alone.
- [ ] The colour relation holds: #E1D5BF as ground, #8D8071 carrying the style, #403B35 for text and outlines
- [ ] The result still works without the decorative layer: hierarchy, reading order and primary action remain clear
- [ ] Responsive, accessibility or physical-production constraints have been checked for the chosen medium
- [ ] No AI interpretation image has been used as evidence or copied as a visual reference
- [ ] Logos, proprietary type, exact interface geometry and existing artwork compositions have been excluded unless separately licensed
- [ ] Community, regional or subcultural context has been preserved where it is part of the style
- [ ] At least one reference work below has been studied directly
- [ ] The caution above ("What to avoid") has been addressed

## Related styles

- **Photogravure (フォトグラヴュール)** — A photomechanical intaglio method that transfers a photographic image to a plate and prints it in ink. Fine detail and apparently continuous tones acquire the character of paper and ink. It is distinct from a silver photograph, planographic collotype and the industrial context of rotary gravure. → https://indexstyle.org/styles/photogravure
- **Halftone (ハーフトーン（網点）)** — Halftone converts continuous tone into regularly spaced dots of changing size so it can be printed; from a distance they return to tone, while enlargement reveals the screen as material. → https://indexstyle.org/styles/halftone

## Compose it with something else

The dictionary can put this entry in a structural role and another in an accent role, and report where the two fight: https://indexstyle.org/compose?ids=collotype+photogravure

## Further study

- Eadweard Muybridge — Animal Locomotion
- University of Illinois Library — PSAP: Photomechanical Prints
- Getty — Atlas of Analytical Signatures: Collotype

## Reference works

- Eadweard Muybridge, Animal Locomotion: Annie G. galloping, 1887 — collotype, Library of Congress — Wikimedia Commons / Public domain — https://commons.wikimedia.org/wiki/File:Animal%20locomotion%20-%2016%20frames%20of%20racehorse%20%22Annie%20G.%22%20galloping%20LCCN2006691786.jpg

## Source of record

- University of Illinois Library — PSAP: Photomechanical Prints — https://psap.library.illinois.edu/collection-id-guide/photomechanical

## Machine surfaces

- JSON: https://indexstyle.org/api/styles/collotype
- Image-generation prompt (legally clean): https://indexstyle.org/styles/collotype/prompt.txt
- MCP: https://indexstyle.org/mcp (tools: search_styles, get_style, compare_styles, compose_styles, find_related_styles; prompts: image-prompt, apply-style)