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2. pngcrush - Wikipedia

   en.wikipedia.org/wiki/Pngcrush

   pngcrush compresses the image with multiple different combinations and then stores the smallest of the resulting files. [4] Since it is not possible to go through all the combinations, pngcrush uses heuristics to choose the methods to try. By default, pngcrush uses just a few common methods to crush the file.

3. Multiple-image Network Graphics - Wikipedia

   en.wikipedia.org/wiki/Multiple-image_Network...

   Multiple-image Network Graphics (MNG) is a graphics file format published in 2001 for animated images. Its specification is publicly documented and there are free software reference implementations available. MNG is closely related to the PNG image format.

4. Image file format - Wikipedia

   en.wikipedia.org/wiki/Image_file_format

   CGM (Computer Graphics Metafile) is a file format for 2D vector graphics, raster graphics, and text, and is defined by ISO/IEC 8632. All graphical elements can be specified in a textual source file that can be compiled into a binary file or one of two text representations. CGM provides a means of graphics data interchange for computer ...

5. Alpha compositing - Wikipedia

   en.wikipedia.org/wiki/Alpha_compositing

   In computer graphics, alpha compositing or alpha blending is the process of combining one image with a background to create the appearance of partial or full transparency. [1] It is often useful to render picture elements (pixels) in separate passes or layers and then combine the resulting 2D images into a single, final image called the composite.

6. Wikipedia:Preparing images for upload - Wikipedia

   en.wikipedia.org/wiki/Wikipedia:Preparing_images...

   optipng -o7 file.png advdef -z4 file.png pngout /ks file.png deflopt file.png 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.

7. On Today's Date: First Northeast Snowstorm Of A ... - AOL

   www.aol.com/news/todays-date-first-northeast...

   Northeast snowfall along the Interstate 95 Boston to Washington, D.C. corridor has been lacking in recent years.. But on Dec. 19, 2009, 15 years ago today, the Northeast was in the midst of a ...