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Squashed 'docs/' changes from 715741f73..4e7e1815b 4e7e1815b Fix some typos d23d8f5c4 Remove 'fundamentals' category from function pages 52fa65e15 Mention Chroma as the preferred syntax highlighter 64ca535db Merge commit '8762aee8afe30bec6f1fbc9560749983dc44d60b' 8762aee8a Squashed 'themes/gohugoioTheme/' changes from 396b859f..6f3a8bf5 03f0673a9 Move the gopher to the theme 320e268cd Spelling e45b640f7 More layout lookup work fe0ad9d9d Sync the YAML config menu example with TOML's b9505fc70 Remove template reference to ordinal numbers 0fa2532d3 Remove deprecated Hugoidx, add native hugo solution 2152b907c Fix a link in the last commit 47614f416 Manually specifying heading anchors in Markdown content 9d6770d2a Release notes 0.37.1 e1eed8b27 Remove some unused images e960046f5 releaser: Prepare repository for 0.38-DEV 4fa83a4ee releaser: Add release notes to /docs for release of 0.37.1 46c879995 releaser: Bump versions for release of 0.37.1 fb3ac5a3e releaser: Prepare repository for 0.38-DEV 4870c8e7b Update archetypes.md 232c0b578 Merge commit '2b18014fd0aa99e9f1a5610ba875101351a90de3' 2b18014fd Squashed 'themes/gohugoioTheme/' changes from fe71e360..396b859f 62567e9aa Add some "writing guidelines" 7cfd530d2 Revise the archetype docs 5d4c3c03c Update data-templates.md e5fee3099 Update page-bundles.md ca7f03c8d Update page-bundles.md 2a7fdc269 Fix typo 'vailable' to 'available' line 53 999b75201 LastMod should be Lastmod? 099f46ca5 Fix spacing in content-management/types.md 6bcdc58ef Word choice improvements 20e8a21f6 update rss linking docs 7ef44d262 Add some missing configuration entries f1c7aa568 Sort config list 5cb8ceade Create a proper definition list for the configuration settings 25dffe4ac Send custom dimensions in GA 55df01a34 Fix broken gtag 6c8772aad Add site to GA config e63acb894 Remove conflicting release note for 0.35 f30083a23 Add branch to GA config 99caedb96 Set the small-multiples to draft 4a33c70ab Polish the Small Multiples showcase 7b2f1ea2e Add small multiples showcase e78e96bae Add new sponsor c42943041 updated to new Forestry logo e07eda273 Add OS env to faq 414f0dbc6 Release Hugo 0.37 85f0cc324 Merge branch 'temp37' 1e6da9497 Rebuild images 75e97adfc releaser: Add release notes to /docs for release of 0.37 50b887cb0 releaser: Bump versions for release of 0.37 7acf73ba3 Merge commit '900b5f6cfe5a377ef369d26cd700201be4cf6b06' 819d02c30 Merge commit '374d184e6747678364fd61f5faf328ec9205eb6b' c7eacf018 Fix typos in development contribution doc git-subtree-dir: docs git-subtree-split: 4e7e1815b742659dec1c8f59a1896a3396c7b6e9
2018-03-11 15:39:20 -04:00
---
date: 2018-02-27
title: "Hugo 0.37: Preserve PNG Colour Palette"
description: "Reduces processed PNG file sizes. And 0.37 is built with Go 1.10!"
categories: ["Releases"]
---
The main item in Hugo `0.37` is that we now properly preserve the colour palette when processing `PNG` images. We got reports from users experiencing their `PNG` images getting bigger in file size when scaled down. Now, if you, as an example, start out with a carefully chosen 8 bit colour palette (i.e. `PNG-8`), this is now what you will end up with. A special thanks to [@aitva](https://github.com/aitva) for doing the investigative work finding a proper fix for this issue.
This release represents **40 contributions by 5 contributors** to the main Hugo code base.
[@bep](https://github.com/bep) leads the Hugo development with a significant amount of contributions, but also a big shoutout to [@vassudanagunta](https://github.com/vassudanagunta), [@kaushalmodi](https://github.com/kaushalmodi), and [@curttimson](https://github.com/curttimson) for their ongoing contributions.
And as always a big thanks to [@digitalcraftsman](https://github.com/digitalcraftsman) for his relentless work on keeping the documentation and the themes site in pristine condition.
Many have also been busy writing and fixing the documentation in [hugoDocs](https://github.com/gohugoio/hugoDocs),
which has received **24 contributions by 8 contributors**. A special thanks to [@bep](https://github.com/bep), [@4RU](https://github.com/4RU), [@kaushalmodi](https://github.com/kaushalmodi), and [@mitchchn](https://github.com/mitchchn) for their work on the documentation site.
Hugo now has:
* 23649+ [stars](https://github.com/gohugoio/hugo/stargazers)
* 447+ [contributors](https://github.com/gohugoio/hugo/graphs/contributors)
* 197+ [themes](http://themes.gohugo.io/)
## Notes
* Hugo will now convert non-string `YAML` map keys to string. See [#4393](https://github.com/gohugoio/hugo/issues/4393) for more information. You will get a `WARNING` in the console if you are touched by this.
* We have improved the `PNG` processing, and have incremented the version numbers on the URL for the processed `PNG` image. This will just work, but you may want to run `hugo --gc` to clean up some old stale images in the resource cache.
## Enhancements
### Templates
* Add template func for TOML/JSON/YAML docs examples conversion. This is mainly motivated by the needs of the Hugo docs site. [d382502d](https://github.com/gohugoio/hugo/commit/d382502d6dfa1c066545e215ba83e2e0a9d2c8d7) [@bep](https://github.com/bep) [#4389](https://github.com/gohugoio/hugo/issues/4389)
### Core
* Refactor tests for JSON, YAML and TOML equivalency, add coverage [82eefded](https://github.com/gohugoio/hugo/commit/82eefded1353f0198fd8fe9f7df1aa620d3d50eb) [@vassudanagunta](https://github.com/vassudanagunta)
* Re-enable YAML data tests disabled in f554503f [e1728349](https://github.com/gohugoio/hugo/commit/e1728349930e2cc1b6580766473de98adb0f3e50) [@vassudanagunta](https://github.com/vassudanagunta)
### Other
* Preserve color palette for PNG images [799c654b](https://github.com/gohugoio/hugo/commit/799c654b0d39ec869c2da24d41de3636eb7157f0) [@bep](https://github.com/bep) [#4416](https://github.com/gohugoio/hugo/issues/4416)
* Use `Floyd-Steinberg` dithering for PNGs [13ea1e7c](https://github.com/gohugoio/hugo/commit/13ea1e7c352852966f88ef119d9434bbb1ee62fa) [@bep](https://github.com/bep) [#4453](https://github.com/gohugoio/hugo/issues/4453)
* Make `ge`, `le` etc. work with the Hugo Version number [0602135f](https://github.com/gohugoio/hugo/commit/0602135fd44b0cfa0a51b0ec6e451ae58ac95666) [@bep](https://github.com/bep) [#4443](https://github.com/gohugoio/hugo/issues/4443)
* Update dependencies [eaf573a2](https://github.com/gohugoio/hugo/commit/eaf573a2778e79287b871b69f4959fd3082d8887) [@bep](https://github.com/bep) [#4418](https://github.com/gohugoio/hugo/issues/4418)
* Update to Go 1.10 (!) Take 2 [a3f26e56](https://github.com/gohugoio/hugo/commit/a3f26e56368c62b0900a10d83a11b7783630963b) [@bep](https://github.com/bep)
* Update to Go 1.10 (!) [ff10c15a](https://github.com/gohugoio/hugo/commit/ff10c15a93632043f7a7f6551a30487c9ef58c50) [@bep](https://github.com/bep)
* Add WARNING for integer YAML keys [0816a97a](https://github.com/gohugoio/hugo/commit/0816a97a469f11d8e9706143975eaa532e29639b) [@bep](https://github.com/bep) [#4393](https://github.com/gohugoio/hugo/issues/4393)
* Tune stringifyMapKeys [10a917df](https://github.com/gohugoio/hugo/commit/10a917dfdce8851666c5b89ebc02af6f6c84ab59) [@bep](https://github.com/bep)
* Rename stringifyYAMLMapKeys to stringifyMapKeys [d4beef0d](https://github.com/gohugoio/hugo/commit/d4beef0d2bb8f6481fa80e1d938454a7d4e38814) [@bep](https://github.com/bep)
* Add benchmarks for stringifyYAMLMapKeys [51213e0b](https://github.com/gohugoio/hugo/commit/51213e0be19fc19dbca9815afa95c73bd6d159c2) [@bep](https://github.com/bep)
* Add support for `YAML` array data files [1fa24177](https://github.com/gohugoio/hugo/commit/1fa2417777d82b81bf37919ad02de4f5dcbf0d50) [@vassudanagunta](https://github.com/vassudanagunta) [#3890](https://github.com/gohugoio/hugo/issues/3890)
* Account for array type data in data dir merge/override logic [bb549a0d](https://github.com/gohugoio/hugo/commit/bb549a0d57505a6b8f28930bb91a9ab44cbb3288) [@vassudanagunta](https://github.com/vassudanagunta) [#4366](https://github.com/gohugoio/hugo/issues/4366)
* Add "target" and "rel" parameters to figure shortcode [2e95ec68](https://github.com/gohugoio/hugo/commit/2e95ec6844bf65a25485bdc8e2638e45788f2dcf) [@kaushalmodi](https://github.com/kaushalmodi)
* image" property, not "twitter:image:src" [76d38d5e](https://github.com/gohugoio/hugo/commit/76d38d5e5322fc6220fb9e74f9ca0668606ebb5d) [@kaushalmodi](https://github.com/kaushalmodi)
## Fixes
### Core
* Continue `GitInfo` lookup on error [e9750d83](https://github.com/gohugoio/hugo/commit/e9750d831f749afa928d8a099af5889d18cb2484) [@bep](https://github.com/bep)
* Fix paginator `URL` for sections with URL in front matter [9f740b37](https://github.com/gohugoio/hugo/commit/9f740b37cfb3278e34a5d085380ccd4d619dabff) [@bep](https://github.com/bep) [#4415](https://github.com/gohugoio/hugo/issues/4415)
### Other
* Fix bug in Site.assembleSections method [00868081](https://github.com/gohugoio/hugo/commit/00868081f624928d773a7b698654766f8cd70069) [@vassudanagunta](https://github.com/vassudanagunta) [#4447](https://github.com/gohugoio/hugo/issues/4447)
* Update Blackfriday to fix footnote HTML5 validation error [492fea7c](https://github.com/gohugoio/hugo/commit/492fea7cd2bfcbdfe9f56aa0ae659cf62648833b) [@bep](https://github.com/bep) [#4433](https://github.com/gohugoio/hugo/issues/4433)
* Fix `YAML` maps key type [16a5c745](https://github.com/gohugoio/hugo/commit/16a5c74519771138023f019fe535fa5b250dc50d) [@dmgawel](https://github.com/dmgawel) [#2441](https://github.com/gohugoio/hugo/issues/2441)
* Remove `ERROR` on missing baseURL [55bd46a6](https://github.com/gohugoio/hugo/commit/55bd46a633d68f62e131457631ba839d6f876a55) [@bep](https://github.com/bep) [#4397](https://github.com/gohugoio/hugo/issues/4397)
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