Oct 19

Remove Duplicate GIF Photos too – now with the duplicate photo deleting program. Remove duplicate photos with the duplicate photo deleting application.

GIF, 'Graphics Interchange Format' was introduced in the 1980s on CompuServe to allow high-quality, high-resolution graphics to be displayed on a variety of graphics hardware and was intended as an exchange and display mechanism for graphics images. The rise of the Internet and in particular the web saw GIF usage explode.
Saving a photographic image as GIF firstly achieves a 3:1 compression by a reduction in color depth from 16 million colors to 256. A GIF graphic is stored as a sequence of pixels with 256 color values from a image specific color palette.

Dithering reduces the visual impact of the reduction in number of colors. This raster data is then compressed according to the LZW algorithm (Unisys patented).

GIF does significantly better than JPEG on images with only a few distinct colors, such as line drawings. Not only is GIF lossless for such images, but it often compresses them more than JPEG can. For example, large areas of pixels that are all exactly the same color are compressed very efficiently indeed by GIF. JPEG can't squeeze such data as much as GIF does without introducing visible defects.

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Sep 28

Duplicate photo deleter now can locate duplicate photos in all popular graphic formats, including JPEG. This graphic format was created by the organization, named Joint Photographic Experts Group.

JPEG (pronounced "jay-peg") is a standardized image compression mechanism. JPEG stands for Joint Photographic Experts Group, the original name of the committee that wrote the standard.

JPEG compression is lossy, meaning that the decompressed image isn't quite the same as the one you started with.  JPEG is designed to exploit known limitations of the human eye, notably the fact that small color changes are perceived less accurately than small changes in brightness.  Thus, JPEG is intended for compressing images that will be looked at by humans.  If you plan to machine-analyze your images, the small errors introduced by JPEG may be a problem for you, even if they are invisible to the eye.

JPEG compression is designed for compressing either 16 million color (24 bit) or 256 gray scale images of natural, real-world scenes.  It works well on photographs, naturalistic artwork, and similar material; not so well on lettering, simple cartoons, or line drawings.

A useful property of JPEG is that the degree of lossiness can be varied by adjusting compression parameters.  This means that you can trade off file size against output image quality. Most JPEG compressors let you pick a file size vs. image quality tradeoff by selecting a quality setting.  The quality scale is purely arbitrary; its not a percentage of anything.

For full-color images, the uncompressed data is normally 24 bits/pixel.  The best known lossless compression methods can compress such data about 2:1 on average.  JPEG can typically achieve 10:1 to 20:1 compression without visible loss, bringing the effective storage requirement down to 1 to 2 bits/pixel.  30:1 to 50:1 compression is possible with small to moderate defects, while for very-low-quality purposes such as previews or archive indexes, 100:1 compression is quite feasible. 

An image compressed 100:1 with JPEG takes up the same space as a full-color one-tenth-scale thumbnail image, yet it retains much more detail than such a thumbnail.

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Sep 02

Now duplicate PNG photos will be found too. Remove duplicate PNG photos, find and delete duplicate PNG photos with this PNG duplicate photo deleting software.

The Portable Network Graphics (PNG) format was designed to replace the older and simpler GIF format and, to some extent, the much more complex TIFF format.

For image editing PNG provides a useful format for the storage of intermediate stages of editing. PNG's compression is fully lossless–and since it supports up to 48-bit truecolor or 16-bit grayscale–saving, restoring and re-saving an image will not degrade its quality. Unlike TIFF, the PNG specification leaves no room for implementors to pick and choose what features they'll support; the result is that a PNG image saved in one application is readable in any other PNG-supporting application.

For the Web, PNG really has three main advantages over GIF: variable transparency, cross-platform control of image brightness, and a method of progressive display. PNG also compresses better than GIF in almost every case, but the difference is generally only around 5% to 25%.

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