508:, reverse this scale with 0 as highest quality and 100 as the lowest quality. Don't mistake the 0 to 100 scale for a percentage, in that using 1/2 the setting does not result in 1/2 the quality, nor does it produce a file of 1/2 the size. Also, 100 does not mean "100%", as the image is still compressed, resulting in a minute loss of detail. Since most JPEGs in Knowledge (XXG) will be rescaled anyway before appearing on pages, a quality setting of 95 is appropriate. (Settings above 95 increase size dramatically for little improvement in image quality.)
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It is normal for image editing programs to produce poor PNG compression, even when run with their maximum compression choices. As a result, there are a variety of tools to compress PNGs without any loss of quality. However, if the image will be scaled by
Mediawiki before viewing, then these steps are
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Some digital cameras and smartphones store additional information (known as EXIF metadata) in the JPEG files they create. Be aware that all such metadata is publicly visible across
Knowledge (XXG) and Wikimedia. If you don’t want to reveal the information remove it from the file before you upload it
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OptiPNG usually outputs smaller files than pngcrush, as the latter preserves some information to strictly follow the PNG specification. AdvDef can be used after either of them to further improve the results. AdvDef is straightforward to use, as it optimizes only the compression itself. Zopfli tends
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Images that are not photographs, such as diagrams and screen captures of applications or older video games, use few colors. If it makes sense, save the image in indexed mode. A truecolour PNG can often be converted to indexed mode without changing the look of the image, while saving on file size.
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better than an equivalent PNG. Therefore, for images that consist largely or entirely of polygons, lines, and curves (national flags, road signs, etc.), SVG is the preferred format. Shown here are two example enlarged crops of an image, one in PNG format, one in SVG format showing higher quality.
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Another drawback is the large file size you will end up with. JPEG compression has many options but most commonly only two colour spaces: 24-bit RGB (8 bits per sample) and 8-bit greyscale. Most importantly, JPEG by its nature cannot support indexed colour. In the example on the right, a 4-colour
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After any compression, the image should be compared to the original. It's occasionally the case that quirks in the original cause transparency to be lost even in compression which is intended to be lossless. This commonly, but not always, shows up as a change in the background colour that is
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image may use more colours than you notice, because anti-aliasing smooths jagged edges by adding shades of grey where once there was black or white. Anti-aliased black-and-white images usually need to be saved as 16-colour or 256-colour images instead. See the illustration at the right.
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Each of these utilities uses a different, more sophisticated "deflate" compression method variant on the PNG and generally produces a smaller file when run after the other tools. If the smallest result matters, try some experimenting to see what produces the best result.
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is designed to work with large areas of solid colour that have sharp boundaries. It is therefore a good format for diagrams and cartoons. But it does not automatically give you the smallest possible file size. There are some things that need to be done by hand.
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As stated above, JPEG (Joint
Photographic Experts Group) was developed with photographic images in mind. Although the JPEG algorithms are quite good, there are a couple of tips that will help to get the smallest file size possible without sacrificing quality:
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format that encodes an image as a series of geometric shapes. If this confuses you, don't worry; you don't need to understand the technical aspects to create or upload images. What this means in practice is that an SVG image scales to different sizes
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Note also that these chains, particularly the pngrewrite step, will discard non-image blocks, often including copyright or creator details. Check the pngrewrite and other program options if you want to preserve this information.
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When saving a JPEG, the graphics program will let you choose the compression level. Usually the values range from 0 to 100 where 100 is the best quality possible with very little compression applied. Some apps, notably
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In any of the above cases, there should be a note saying what specific software is required to edit the image. Data formats and code that are compatible with free software should be preferred.
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like GIFs, PNGs, or JPEGs to SVG, and some images (especially photos) are not conducive to this treatment. If a diagram cannot be produced in SVG, then a PNG image is preferred over a JPEG.
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package) can be useful. It automates PNG optimization, utilizing pngcrush and a variant of pngrewrite as underlying engines to achieve results similar to that of optipng.
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fit the number of colors in the image? Diagrams usually have few colours. If a diagram has 4 colours, there is no need to store it in a 24-bit (
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meant for photographs. Compressing drawings or diagrams with JPEG results in an image of poor quality, because the human eye can spot the
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simply save the JPEG as PNG because this will result in an even larger file. There is a nice tutorial at
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to achieve better compression ratios than pngcrush or OptiPNG, but takes significantly longer to run.
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Many people compare a 24 bit PNG with an 8 bit GIF, which is an invalid comparison.
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If you do not have an original file but only a JPEG that really should be a PNG,
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Adobe
Photoshop has historically been known as being poor at creating PNG files.
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optipng -o7 file.png advdef -z4 file.png pngout /ks file.png deflopt file.png
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pointless. Some such tools and information on using them is shown below.
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There is a delusion among many web designers that PNGs are larger than
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For quick-and-dirty optimization, the opt-png script (found in the
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For quick compression, simply use OptiPNG with no options at all:
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for simple diagrams (especially those that need to be scaled).
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Knowledge (XXG):How to reduce colors for saving a JPEG as PNG
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Knowledge (XXG):How to reduce colors for saving a JPEG as PNG
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Choose a colour depth appropriate for the number of colours
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may apply. Substantive edits to this page should reflect
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If the image was generated from data (e.g. a graph in
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If the image was generated from a script (e.g. in a
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681:) from the files without affecting the image data.
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589:for information on indexed mode and truecolour.)
552:JPEG files can also be losslessly optimized with
474:program. SVGs can also be altered simply with a
351:when it should have been saved as PNG. JPEG uses
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673:PNG files can also be losslessly optimized with
805:"Zopfli Optimization: Literally Free Bandwidth"
40:This page documents an English Knowledge (XXG)
445:format, encoding the value of each individual
347:To the right is an example of a file saved as
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8:
205:. This delusion originates from two facts:
48:Editors should generally follow it, though
2150:Category:Knowledge (XXG) information pages
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857:
837:Guidelines for drawing chemical structures
753:(Mailing list). 2008-04-15. Archived from
482:. For a list of SVG editing software, see
91:to Knowledge (XXG) or, preferably, to the
776:"Compress data more densely with Zopfli"
677:, which removes all hidden "extras" (or
556:, which removes all hidden "extras" (or
545:that automates JPEG optimization, using
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699:"pinga, GUI image optimizer (PNG/JPG)"
466:SVGs can be easily created with many
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815:from the original on 2 November 2020
786:from the original on 2 November 2020
120:There are 4 basic choices for image
1889:User CSS for monospaced coding font
1137:Non-admin and admin-only page moves
852:Commons:Preparing images for upload
182:The editability and scalability of
2221:Knowledge (XXG) editing guidelines
847:Knowledge (XXG):Graphics tutorials
56:. When in doubt, discuss first on
25:
500:using an appropriate application.
1830:Bug reports and feature requests
842:Knowledge (XXG):Image use policy
723:"pingo, image optimizer for web"
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2143:Category:Knowledge (XXG) how-to
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659:obviously visible at a glance.
612:(open source), fork of pngcrush
567:only, and are being used under
484:List of vector graphics editors
888:Knowledge (XXG) technical help
634:pinga (with GUI) / pingo (CLI)
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1:
1513:How to improve image quality
1391:Complete diff and link guide
747:"pngcrush and optipng notes"
573:Template:Infobox album#Cover
311:Do not save diagrams as JPEG
1949:Cleaning up vandalism tools
1835:TimedMediaHandler extension
1471:Preparing images for upload
615:AdvDef/AdvPNG, part of the
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2035:Beta Features at MediaWiki
1508:Basic bitmap image editing
1386:Simple diff and link guide
470:programs such as the free
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58:this guideline's talk page
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1310:Advanced table formatting
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549:as the underlying engine.
541:contains a script called
2030:Wikimedia Cloud Services
1884:Common.js and common.css
1879:Catalogue of CSS classes
1638:Advanced template coding
1481:Options to hide an image
907:village pump (technical)
480:Knowledge (XXG):SVG Help
137:for photographic images.
2154:Further navigation at:
1894:Classes in microformats
1449:Moving files to Commons
1268:Conditional expressions
516:digital generation loss
336:lossy JPEG compression
111:computer algebra system
1954:Customizing watchlists
1869:Cascading Style Sheets
1643:Template documentation
1518:Graphics Lab resources
1461:Introduction to images
1273:Switch parser function
780:Google Developers Blog
435:Simple changes to SVG
353:lossy data compression
341:compression artifacts
339:Enlarged view showing
1767:File description page
1486:Extended image syntax
619:compilation (GNU GPL)
357:compression artifacts
195:compression algorithm
89:uploading image files
2018:Navigation shortcuts
2003:Alternative browsing
1001:Multilingual support
979:How to create a page
156:Other image formats
149:for everything else.
143:for animated images.
18:Knowledge (XXG):PIFU
1724:Guide to Scribbling
1602:EasyTimeline syntax
1381:Simplest diff guide
1248:Line-break handling
537:. A package called
269:Does the number of
263:anti-aliased image
1717:Costs and benefits
1663:Citation templates
1530:Visual file markup
1503:Graphics tutorials
1444:Creation and usage
1320:Conditional tables
1203:User contributions
1144:Notifications/Echo
1057:User access levels
1045:Special Characters
945:Keyboard shortcuts
531:jpegtran -optimize
468:desktop publishing
359:around the edges.
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2188:Citation metadata
2093:Navigation popups
2051:AfC helper script
2044:Automated editing
1899:Markup validation
1784:Project/Wikipedia
1551:Graphs and charts
1525:Sound file markup
1427:videos and sounds
1290:Sections and TOCs
1090:Special page help
751:png-mng-implement
645:optipng file.png
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158:should be avoided
98:Keep the source:
93:Wikimedia Commons
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42:editing guideline
16:(Redirected from
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2023:Optimum tool set
1874:HTML in wikitext
1818:User page design
1609:WikiHiero syntax
1476:Uploading images
1466:Picture tutorial
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1300:Introduction
1171:Random pages
1062:VisualEditor
1006:Page history
967:Edit toolbar
940:Bypass cache
899:the Teahouse
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817:. Retrieved
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788:. Retrieved
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2183:Referencing
2108:Ultraviolet
1966:IRC Scripts
1929:Preferences
1673:Lua project
1498:Gallery tag
1398:Colon trick
1258:Magic words
1161:Page import
1100:Edit filter
664:littleutils
617:AdvanceCOMP
587:color depth
539:littleutils
476:text editor
2156:Help pages
2140:See also:
2056:AntiVandal
1993:User style
1986:Techniques
1959:Hide pages
1742:Namespaces
1434:Media help
1408:Pipe trick
1403:Link color
1315:Collapsing
1236:Cheatsheet
1191:Linksearch
1110:Logging in
1038:Editnotice
957:CharInsert
911:talk pages
819:2020-11-02
790:2020-11-02
761:2014-03-27
732:2022-09-05
727:css-ig.net
708:2022-09-05
703:css-ig.net
685:References
290:avoid this
279:truecolour
258:309 bytes
251:180 bytes
50:exceptions
2195:Templates
2117:Inactive
2113:WPCleaner
1922:and tools
1904:Span tags
1825:MediaWiki
1794:Archiving
1700:Job queue
1678:Resources
1633:Templates
1619:Templates
1561:Barcharts
1369:Permanent
1364:Interwiki
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1208:Watchlist
1186:Searching
1016:Page name
972:Reverting
903:help desk
565:infoboxes
490:JPEG tips
441:PNG is a
54:consensus
2215:Category
2173:Accounts
2071:Creating
1808:Template
1752:Category
1668:Lua help
1597:Timeline
1491:SVG help
1231:Wikitext
1223:Wikitext
1095:AllPages
1083:-related
1050:Entering
1028:Printing
989:Tutorial
831:See also
813:Archived
784:Archived
679:metadata
675:PNGExtra
625:(gratis)
604:pngcrush
600:(gratis)
580:PNG tips
558:metadata
554:JPGExtra
547:jpegtran
449:, while
387:Shortcut
193:The PNG
178:Diagrams
67:Shortcut
2103:Twinkle
2098:RedWarn
2076:history
1934:Gadgets
1847:Special
1626:modules
1243:Columns
1079:Special
952:Editing
925:General
623:DeflOpt
610:OptiPNG
543:opt-jpg
535:libjpeg
472:Scribus
395:WP:USOP
283:palette
75:WP:PIFU
2088:Huggle
2083:HotCat
1842:Module
1799:Simple
1779:Portal
1456:Images
1305:Basics
1295:Tables
629:Zopfli
598:PNGOUT
368:do not
2126:STiki
2121:igloo
1998:Tools
1976:Guide
1939:Skins
1757:Draft
1695:Purge
1683:To do
1439:Files
1423:Media
1376:Diffs
1354:Links
1346:diffs
1342:Links
1253:Lists
585:(See
453:is a
447:pixel
275:pixel
87:When
2178:Bots
2066:Bots
1981:List
1859:and
1857:HTML
1813:User
1789:Talk
1774:Help
1762:File
1413:URLs
1344:and
1198:Tags
1122:Logs
1081:page
1067:Help
1021:Help
349:JPEG
273:per
271:bits
203:GIFs
171:TIFF
135:JPEG
1861:CSS
1624:Lua
1621:and
1149:FAQ
984:IRC
915:IRC
913:or
524:PNG
522:or
460:far
451:SVG
299:An
184:SVG
165:BMP
147:PNG
141:GIF
129:SVG
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20:)
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