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PNG File Format

PNG are used for storing with Graphic Elements Like Logos, Icons...

PNG image is compressed without quality loss. The main advantage of the format PNG is storage and usage of intermediate editing stages

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PNG Working Format

Impotance of PNG format in Graphic Design World

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Advantage of PNG - Png Image is Compressed without Quality Loss

PNG image is compressed without quality loss. Usually PNG are used for storing graphics with sharp edges, text graphics, graphic elements (logos, designs, icons).

The main advantage of the format PNG is storage and usage of intermediate editing stages. This is due to the fact that compression at any stage of conservation passes without any loss of quality.

The PNG format (pronounced "PING") was designed to replace the antiquated GIF format, and to some extent, the TIFF format. It utilizes lossless compression, meaning no image data is lost when saving or viewing the image. It is a universal format that is recognized by the World Wide Web consortium, and supported by modern web browsers.

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Importance of PNG - PNG Format is Boss in Graphic Design World

The PNG format was developed when it was discovered by the entire development community in early 1995 that the GIF image format uses LZW compression, technology which was patented in 1985 by Unisys corporation. The initial developers of the GIF format, Compuserve, was not aware of this at the time of it's development in 1987.

Now commercial and non-commercial software developers who's application supports the reading or writing of GIF or LZW TIFF images must pay substantial royalties and fees. In addition web developers who use any non-Microsoft application to generate GIF images directly to a web server also have to pay similar royalties and fees. The PNG format does not have any patent restrictions and can be read and written freely by software developers and webmasters a like.



Which one is Better Formats
GIF, TiFF, JPG vs PNG

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png Format vs GIF Format - PNG Format is BEST, Comparison of GIF Format

What about GIF?

GIF images can only be saved as an 8-bit color mapped image, which means you are limited to 256 colors. Remember the GIF format was developed back when most PC's only had the capability of 256 colors.

PNG can be saved not only as 8 bit, but also 24 bit and higher up to 64 bit! GIF images allow one out of the possible 256 colors to be fully transparent. As we discuss below, PNG has a much higher level of transparency support.

Another benefit of PNG over GIF is typically the file size of a PNG is about 20% smaller than the same GIF image. Finally, as discussed in the PNG overview above, GIF has patent restrictions with it's use.

There is one advantage that GIF has over PNG, and that is animation support. Due to the problems with supporting one image format that can be either static "or" animated, the PNG group decided to call the animated version MNG. Unfortunately, browser support for MNG is terrible, and at the time of this writing, not practical to use on the web.



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Png File Format vs Tiff File Formats Which one is Better

What about TIFF?

The TIFF image format has been around for a long time, and will likely be around for quite a while more. The TIFF format was the cross-platform image format by choice until PNG was introduced, and according to some still is. TIFF's are a developer's nightmare. Last I counted there was over 50 different styles of TIFF images. You never know if an application will be able to read a TIFF image or not. One of the more popular TIFF's is the 24-bit LZW compressed version. This has the same patent restrictions as the GIF format does, but until PNG, was the only standard lossless compressed format.

The standard 24 Bit PNG functionally is very similar in function to a LZW compressed TIFF. The TIFF format is able to store multiple images in one file. This is commonly used for FAX images. PNG's do not have this capability. The TIFF format remains to be popular, but there are few reasons to use it for photograph archival with the added benefits of PNG.



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Importance of PNG - Jpg Image Loses Quality if we compressed but png File not

What about JPEG?

Unlike PNG, JPEG uses a lossy compression routine. Lossy compression means that the image loses quality and information each time it is saved. Because JPEG uses lossy compression, the filesize is almost always smaller then a PNG, especially for photographic images. Care must be taken when working with JPEG images as each time a JPEG is re-saved, more and more compression artifacts are introduced.

uses lossless compression it's an ideal format ideal for archival purposes, and for editing before saving a final version as a JPEG. JPEG is the most common image format used on the web, and will continue to be. Most photographic images should be saved as JPEG as opposed to PNG for viewing on the web as the filesize will be much smaller.



All About Alpha

The features we have discussed so far are probably enough to convert anyone into a PNG user. However, perhaps the best thing a PNG has to offer is what's called the alpha channel. An alpha channel is one byte of extra data per pixel (or palette entry for 8-bit images) that represents the transparency level of a pixel.
A PNG image with alpha is capable of 256 levels of transparency. What does all this mean? For one thing, you can antialias text and images so that sharp curves look good against any background. You can apply a true drop shadow which fades into the background. You can create images that take any shape or form. There are many possibilities with alpha transparency.

Browser Support

The unfortunate thing with alpha in PNG's is that browser support is way behind the times, although slowly catching up.
Although both Netscape 4.04+ and Internet Explorer 4.0+ both read PNG images, the windows version of MSIE 5.0 can only read one level of transparency in 8-bit PNG's
At least this allows for direct conversion of GIF's to PNG's. The good news is that the new Mozilla browser (the browser behind Netscape 6.0) fully supports PNG alpha. Microsoft should catch up very soon!

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