--- title: Richard Geldreich's Blog: XUBC7 | daily.dev description: Trellis quantization has been added to XUBC7 (supercompressed universal BC7) via AC truncation. The feature activates only when the PSNR drop stays within a... canonical: https://daily.dev/posts/richard-geldreich-s-blog-xubc7-vdwectleo twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Richard Geldreich's Blog: XUBC7 | daily.dev og:description: Trellis quantization has been added to XUBC7 (supercompressed universal BC7) via AC truncation. The feature activates only when the PSNR drop stays within a... og:url: https://daily.dev/posts/richard-geldreich-s-blog-xubc7-vdwectleo og:image: https://api.daily.dev/og/posts/VdWectleo.png og:image:alt: Richard Geldreich's Blog: XUBC7 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. # Richard Geldreich's Blog: XUBC7 **[Richard Geldreich's Blog](https://daily.dev/sources/richg42)** · 1 min read · 1 upvotes · 0 comments ## Summary Trellis quantization has been added to XUBC7 (supercompressed universal BC7) via AC truncation. The feature activates only when the PSNR drop stays within a configurable channel-weighted PSNR window and doesn't fall below a lower limit, providing gains at higher DCT quality levels. The encoder also supports multiple forms of block-level RDO (Rate-Distortion Optimization), porting video compression techniques into GPU texture supercompression. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Richard Geldreich's Blog](https://daily.dev/posts/richard-geldreich-s-blog-y0tvpbsdx) · Richard Geldreich's Blog · 0 upvotes · 0 comments - [Richard Geldreich's Blog: XBC7](https://daily.dev/posts/richard-geldreich-s-blog-xbc7-baoyp5vfv) · Richard Geldreich's Blog · 0 upvotes · 0 comments - [Richard Geldreich's Blog: XUBC7 Low-Level Format Document](https://daily.dev/posts/richard-geldreich-s-blog-xubc7-low-level-format-document-axycnidki) · Richard Geldreich's Blog · 0 upvotes · 0 comments --- Tags: [#gpu](https://daily.dev/tags/gpu) [View this post on daily.dev](https://daily.dev/posts/richard-geldreich-s-blog-xubc7-vdwectleo) ```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":"Richard Geldreich's Blog: XUBC7","url":"https://daily.dev/posts/richard-geldreich-s-blog-xubc7-vdwectleo","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/richard-geldreich-s-blog-xubc7-vdwectleo"},"datePublished":"2026-06-15T00:20:02.099Z","dateModified":"2026-08-24T06:52:02.612Z","description":"Trellis quantization has been added to XUBC7 (supercompressed universal BC7) via AC truncation. The feature activates only when the PSNR drop stays within a...","image":"https://media.daily.dev/image/upload/s--HRgLpUt6--/f_auto/v1722860399/public/Placeholder%2003","thumbnailUrl":"https://media.daily.dev/image/upload/s--HRgLpUt6--/f_auto/v1722860399/public/Placeholder%2003","isAccessibleForFree":true,"articleSection":"Richard Geldreich's Blog","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":"Richard Geldreich's Blog","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/c17544cee7eb4611a3d752231aaceeb1","url":"https://daily.dev/sources/richg42"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/richard-geldreich-s-blog-xubc7-vdwectleo","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":1},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"gpu","timeRequired":"PT1M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Richard Geldreich's Blog","item":"https://daily.dev/sources/richg42"},{"@type":"ListItem","position":3,"name":"Richard Geldreich's Blog: XUBC7"}]} ```