--- title: Hacking A Commercial Colorimeter To Add RAL Color Code... description: A hardware hacker reverse-engineered a CR4501 colorimeter by extracting its firmware via a debug port, analyzing it in Ghidra, and patching it to display the... canonical: https://daily.dev/posts/hacking-a-commercial-colorimeter-to-add-ral-color-code-support-3libhobvh twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Hacking A Commercial Colorimeter To Add RAL Color Code Support | daily.dev og:description: A hardware hacker reverse-engineered a CR4501 colorimeter by extracting its firmware via a debug port, analyzing it in Ghidra, and patching it to display the... og:url: https://daily.dev/posts/hacking-a-commercial-colorimeter-to-add-ral-color-code-support-3libhobvh og:image: https://api.daily.dev/og/posts/3LibHObvh.png og:image:alt: Hacking A Commercial Colorimeter To Add RAL Color Code Support og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Hacking A Commercial Colorimeter To Add RAL Color Code Support **[Hackaday](https://daily.dev/sources/hackaday)** · 1 min read · 0 upvotes · 0 comments ## Summary A hardware hacker reverse-engineered a CR4501 colorimeter by extracting its firmware via a debug port, analyzing it in Ghidra, and patching it to display the nearest RAL color code directly on the device screen. The project involved overcoming challenges like accidental calibration data erasure and bricking. The result eliminates the need to manually cross-reference color readings with a RAL table. An online flashing tool is also provided for others with the same device. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [I calibrated my TV with a cheap colorimeter, and the results embarrassed my old settings](https://daily.dev/posts/i-calibrated-my-tv-with-a-cheap-colorimeter-and-the-results-embarrassed-my-old-settings-mifcri7c7) · XDA Developers · 0 upvotes · 0 comments - [Terminals should generate the 256-color palette](https://daily.dev/posts/terminals-should-generate-the-256-color-palette-j5fzrp1zs) · Lobsters · 1 upvotes · 0 comments - [Hacking the WiFi-enabled color screen GitHub Universe conference badge](https://daily.dev/posts/hacking-the-wifi-enabled-color-screen-github-universe-conference-badge-0fjlkkqqq) · Simon Willison · 1 upvotes · 0 comments --- Tags: [#embedded](https://daily.dev/tags/embedded), [#firmware](https://daily.dev/tags/firmware), [#reverse-engineering](https://daily.dev/tags/reverse-engineering) [View this post on daily.dev](https://daily.dev/posts/hacking-a-commercial-colorimeter-to-add-ral-color-code-support-3libhobvh) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Hacking A Commercial Colorimeter To Add RAL Color Code Support","url":"https://daily.dev/posts/hacking-a-commercial-colorimeter-to-add-ral-color-code-support-3libhobvh","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/hacking-a-commercial-colorimeter-to-add-ral-color-code-support-3libhobvh"},"datePublished":"2026-07-31T15:58:41.851Z","dateModified":"2026-07-31T16:09:27.652Z","description":"A hardware hacker reverse-engineered a CR4501 colorimeter by extracting its firmware via a debug port, analyzing it in Ghidra, and patching it to display the...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/6f4483b1e2e45e8e926d6b7a566f2ca0?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/6f4483b1e2e45e8e926d6b7a566f2ca0?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"Hackaday","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"Hackaday","logo":"https://media.daily.dev/image/upload/s--JhDfhy70--/f_auto,q_auto/v1767541814/logos/hackaday","url":"https://daily.dev/sources/hackaday"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/hacking-a-commercial-colorimeter-to-add-ral-color-code-support-3libhobvh","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"embedded,firmware,reverse-engineering","timeRequired":"PT1M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Hackaday","item":"https://daily.dev/sources/hackaday"},{"@type":"ListItem","position":3,"name":"Hacking A Commercial Colorimeter To Add RAL Color Code Support"}]} ```