{"id":23448738,"url":"https://github.com/alttiri/image-hash","last_synced_at":"2026-02-03T17:02:21.454Z","repository":{"id":268161476,"uuid":"903037743","full_name":"AlttiRi/image-hash","owner":"AlttiRi","description":"JavaScript image hashing library","archived":false,"fork":false,"pushed_at":"2024-12-15T14:49:40.000Z","size":9972,"stargazers_count":0,"open_issues_count":0,"forks_count":1,"subscribers_count":1,"default_branch":"master","last_synced_at":"2025-01-25T09:46:26.357Z","etag":null,"topics":[],"latest_commit_sha":null,"homepage":"https://npmjs.com/package/@alttiri/image-hash","language":"TypeScript","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":"mit","status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/AlttiRi.png","metadata":{"files":{"readme":"readme.md","changelog":null,"contributing":null,"funding":null,"license":"LICENSE","code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null,"governance":null,"roadmap":null,"authors":null,"dei":null,"publiccode":null,"codemeta":null}},"created_at":"2024-12-13T19:49:21.000Z","updated_at":"2024-12-15T14:49:43.000Z","dependencies_parsed_at":"2024-12-14T20:22:46.142Z","dependency_job_id":"aa8da626-71f3-4974-bbdc-897c98cdea6e","html_url":"https://github.com/AlttiRi/image-hash","commit_stats":null,"previous_names":["alttiri/image-hash"],"tags_count":2,"template":false,"template_full_name":null,"repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/AlttiRi%2Fimage-hash","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/AlttiRi%2Fimage-hash/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/AlttiRi%2Fimage-hash/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/AlttiRi%2Fimage-hash/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/AlttiRi","download_url":"https://codeload.github.com/AlttiRi/image-hash/tar.gz/refs/heads/master","host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":239032245,"owners_count":19570770,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2022-07-04T15:15:14.044Z","host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":[],"created_at":"2024-12-23T22:18:30.337Z","updated_at":"2025-10-30T19:30:36.236Z","avatar_url":"https://github.com/AlttiRi.png","language":"TypeScript","funding_links":[],"categories":[],"sub_categories":[],"readme":"# [Alt-Image-Hash](https://github.com/AlttiRi/image-hash)\n\nAlternative JavaScript image hashing library.\n\n```bash\nnpm i @alttiri/image-hash\n```\n\nThe library to generate a perceptual hash for `ImageData` input.\n\nSupported perceptual hashes:\n- `dHash` (difference hash)\n- `aHash` (average hash)\n- `mHash` (median hash)\n- `bHash` (block hash)\n\n### Basic examples\n\n```ts\nimport {dHash} from \"@alttiri/image-hash\";\n\nconst imagePath = \"alyson_hannigan_500x500.jpg\";\nconst imageData = await getImageData(imagePath);\nconst hash = dHash(imageData);\nconsole.log(hash.hex); // \"8f94b43434245452\"\n```\n\n```ts\nconst hash1 = dHash(await getImageData(\"kittens-3264x2448.jpg\"));\nconst hash2 = dHash(await getImageData(\"kittens-960x720.jpg\"));\n\nconsole.log(hash1.hex); // \"e020acce864cae8a\"\nconsole.log(hash2.hex); // \"e020acce864cae8a\"\nconsole.log(hash1.diff(hash2)); // 0\n```\n\n### How to get `ImageData`?\n\nThe reasonable question is how to get [`ImageData`](https://developer.mozilla.org/en-US/docs/Web/API/ImageData).\n\nOn Node.js I recommend to use [`sharp`](https://www.npmjs.com/package/sharp) library.\nOn browsers get `ImageData` with [`OffscreenCanvas`](https://developer.mozilla.org/en-US/docs/Web/API/OffscreenCanvas).\n\nIt's only ~20 lines of code ([node](https://github.com/AlttiRi/get-image-data/blob/master/src/get-with-sharp.ts), [browser](https://github.com/AlttiRi/get-image-data/blob/master/src/get-with-canvas.ts)). \n\nBut for convenience I created a library [`@alttiri/get-image-data`](https://www.npmjs.com/package/@alttiri/get-image-data):\n```bash\nnpm i @alttiri/get-image-data\n```\nAlso, for Node.js application do not forget to install `sharp` dependency:\n```bash\nnpm i sharp\n```\n\nThen just import it:\n- For a Node.js app:\n    ```ts\n    import {getImageDataWithSharp as getImageData} from \"@alttiri/get-image-data\";\n    ```\n- Fow a web app:\n    ```ts\n    import {getImageDataWithCanvas as getImageData} from \"@alttiri/get-image-data\";\n    ```\n\n---\n\n### Full Node.js example\n\n```bash\nnpm i @alttiri/image-hash @alttiri/get-image-data sharp\n```\n```ts\nimport {getImageDataWithSharp as getImageData} from \"@alttiri/get-image-data\";\nimport {dHash} from \"@alttiri/image-hash\";\n\nconst imagePath = \"alyson_hannigan_500x500.jpg\";\nconst imageData = await getImageData(imagePath);\nconst hash = dHash(imageData);\nconsole.log(hash.hex); // \"8f94b43434245452\"\n```\n\n---\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Falttiri%2Fimage-hash","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Falttiri%2Fimage-hash","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Falttiri%2Fimage-hash/lists"}