PNG and JPG are by far the two most commonly used image file formats on the web. According to W3Techs . JPG is the most commonly used image extension, used by 73.5% of all sites, PNG is second to 72%. When it comes to adding images to a website it is important to know the differences in choosing the best format to use.
Which files are smaller JPEG or PNG?
PNG is a file extension that stands for Portable Network Graphic, and is viewed as .png in browsers and operating systems. It is a faster graphics file format that supports lossless compression. This was originally designed to replace the GIF file format. Version 1.0 was released in October 1996 and defined in RFC 2083 . The first browser support appeared in IE 4 and Netscape 4. PNG is designed to work well in online viewing applications, such as the World Wide Web, and has a progressive viewing option. The type of MIME support for PNG is image/png.
In reality there are NO differences between JPG and JPEG formats. The only difference is the number of characters used in the extension. JPG exists only because previous versions of Windows (MS-DOS 8.3 and FAT-16 file system) required a three-letter extension for filenames. So .jpeg it was reduced to .jpg. This limitation was applied only to Windows and DOS while UNIX and MAC users were able to continue using the extension .jpeg . The most recent versions of Windows, of course, now accept more characters in their extension, however, .jpg it has already been used by the majority of programmers and WEB-designers (and by programs that work with MS-DOS 8.3) and therefore it is still the most common extension.
PNG supports 24-bit RGB and 32-bit RGBA colors. – Gray scale images. The main advantages of images in .png format are therefore when dealing with well-defined graphic elements, with precise outlines and in any case where transparency is needed, preferably with limited color palettes. Even if PNG uses lossless compression, it is better to use this format for medium / small images since in terms of KB, the comparison with JPG is on average penalizing; for large photos, use the JPG format
Referring to JPG, we implicitly refer also to JPEG which are substantially the same thing JPEG, is an extension of the file that stands for Joint Photographic Experts Group . The ISO standard was originally published in 1992. It is a bitmap compression format, with support for lossy compression, with compression ratios from 10: 1 to 20: 1. The compression ratio can be adjusted which means that it is possible to determine a satisfactory balance between weight in KB and quality. The JPG extension is the one most commonly used by digital cameras and photo sharing devices. The JPG format is ideal for photographs , although it is important to note that there is a slight loss of quality due to compression. Subsequent processing of JPG images involves a loss of progressive quality which therefore degrades with each subsequent saving. Although this may be negligible for low resolution images, for professional use it is better to work on the original raw image and save the necessary format only once. The MIME type of JPG support is image/jpeg(defined in RFC 1341 ), except for older versions of Internet Explorer, which provides a MIME type of image/pjpegwhen loading JPG images. JPG is also defined with additional extensions: .jpe, .jif, .jfif, and .jfi. Photo-editing programs such as Adobe Photoshop and Gimp save JPEG / JPG images with the default extension .jpg , both on Windows and Mac. It is possible to save the file in the 2 operating systems and reuse it in the other without problems. As you can see when comparing the PNG and JPG formats there are certainly some differences. PNG uses a lossless compression ratio and has a couple of other benefits, such as the ability to use transparency and color palettes. JPG, on the other hand, uses a lossy compression ratio which makes it ideal for large images for the web thanks to the ability to contain the weight in KB to the benefit of the performances.
Speaking of digital image formats, we often find ourselves talking about JPEG and PNG formats . The JPG format , the acronym for Join Photographic Experts Group (JPEG) is the one most commonly used by everyone on the web. It is a light format. This is why its contraindication is the image quality which is certainly not the best.