cross-referenced news and research resources about
png image format
PNG ( Portable Network Graphics), sometimes pronounced as " ping", is a relatively new "/wiki/Bitmap" title="Bitmap">bitmap image format that
is becoming popular on the World Wide Web and elsewhere. PNG was
largely developed to deal with some of the shortcomings of the GIF format and allows storage
of images with greater color depth and other important information.
PNG is supported by the libpng reference library, a platform
independent library that contains C functions for
handling PNG images.
The motivation for creating the PNG format came in early 1995, after "/wiki/Unisys_Corporation" title="Unisys Corporation">Unisys announced that it would be enforcing "/wiki/Software_patents" title="Software patents">software patents on the LZW "/wiki/Data_compression" title="Data compression">data compression algorithm used for GIF. The algorithm is described in U.S.
Patent 4,558,302 and other patents around the world. There were also other problems
with the GIF format which made a replacement desirable, notably its limitation to 256 "Color">colours at a time when computers capable of displaying far more than 256 colours were becoming common. Although GIF
allows for animation, it was decided that PNG should be a
single-image format. A companion format called MNG has been defined for animation. PNG gained
some additional popularity in August 1999, after Unisys terminated its royalty-free patent
licenses to developers of free software and non-commercial software.
PNG uses a non-patented lossless data
compression method known as deflation. This method is combined with prediction,
where for each image line, a filter method is chosen that predicts the colour of each pixel based on the colours of
previous pixels and subtracts the predicted colour of the pixel from the actual color. An image line filtered in this way is
often more compressible than the raw image line would be. On most images, PNG can achieve greater compression than GIF, but some
implementations make poor choices of filter methods and therefore produce unnecessarily large PNG files.
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updated Sun. August 18, 2024
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Neowin
March 7, 2018
EximiousSoft Logo Designer Pro helps you to develop professional while almost any type of website graphics or business graphics for high resolution printing. It is bundled with over 540+ supreme quality logo templates and 2000+ vector graphics symbols gives you inspiration for logo design. Beside that, ItÃâà...
KnowTechie
February 27, 2018
Keep in mind that you can not only open PDF documents in this way, but also images in JPG or PNG format. Each document that you open will load in a separate tab ... When you do save a PDF document, you can opt to do so in PDF or image format. Simply put Movavi PDF Editor will let you choose to saveÃâà...
Windows Central
February 20, 2018
Capture Area: Select your desired file format (PNG, JPEG, TIFF, PDF and GIF) and time delay. Highlight just the area of your screen that you want to capture and then click to have your customized image appear on your desktop. Record Screen: Record full-screen video with audio from the computersÃâà...
Windows Report (blog)
February 19, 2018
... graphic formats such as SVG, PNG, WMF, PDF, among so many others. Whether you are an illustrator, designer, web designer or just need to create vector images, this is the best software to vectorize images. It also features Bezier and Spiro curves, a powerful text tool, and broad file format compatibility.
Lifehacker
January 26, 2018
When you embed any static image onto Twitter, it tries to compress it down as a JPEG to save bandwidth. For photos, that's usually fine; JPEG was designed for photos. But digital art, infographics, and screenshots usually look their best in the PNG image format. If you upload those as PNGs, Twitter will stillÃâà...
IT PRO
January 11, 2018
PNG files can sometimes be larger than a GIF and so it's worth considering whether the file format is definitely the best option for the use case. ... you might want to consider either resizing the image so it's lower quality, or using an alternative image format that results in a smaller file size (for example GIF).
The Verge
September 19, 2017
High Efficiency Image File Format (HEIC) is a new image container format from the developers of MPEG, a popular audio and video compression standard. HEIC will be used by default on new photos on iOS 11, and it's designed to save you storage space. As it's a new container format, there will be someÃâà...
TWCN Tech News (blog)
September 13, 2017
We all download images or make memes to share them on the social media casually or for professional work. But because turning everything into PDF solves quality issues, we don't seem to need to look into the image file formats. But what's the harm in knowing which image file formats are best suited forÃâà...
Mac Rumors
December 31, 1999
You can also change the default file format that the screenshots are saved in by following these steps. The last ... To change the screenshot format to JPG, TIFF, GIF, PDF, or PNG, type in the command defaults write com.apple.screencapture type followed by a space, and then type the relevant format suffix.
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