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2. Help : How to reduce colors for saving a JPEG as PNG

   en.wikipedia.org/wiki/Help:How_to_reduce_colors...

   Sometimes, you find a drawing or similar image useful for a Wikipedia article, that was saved as a JPEG but should have been saved as a PNG.JPEG is good for images where the color changes fluidly throughout the image, like in a photograph, whereas PNG files are good for images with relatively few colors, such as a drawing of a flag, a chart, or a map; note that sometimes SVG is better.

3. Template:Convert to PNG - Wikipedia

   en.wikipedia.org/wiki/Template:Convert_to_PNG

   Main page; Contents; Current events; Random article; About Wikipedia; Contact us

4. File:NNlogo-block-300x300.png - Wikipedia

   en.wikipedia.org/wiki/File:NNlogo-block-300x300.png

   Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Donate

5. File:Icecat1-300x300.svg - Wikipedia

   en.wikipedia.org/wiki/File:Icecat1-300x300.svg

   Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.1, 1.2 or 1.3, as published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.

6. Wikipedia:Preparing images for upload - Wikipedia

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

   PNG is a raster graphics format, encoding the value of each individual pixel, while SVG is a vector graphics format that encodes an image as a series of geometric shapes. If this confuses you, don't worry; you don't need to understand the technical aspects to create or upload images.

7. pngcrush - Wikipedia

   en.wikipedia.org/wiki/Pngcrush

   pngcrush can also change the color type of the image. For a true-color image, changing the color type from 2 to 0 converts it to greyscale. Greyscale images are generally smaller than truecolor images because, in addition to the optional alpha channel, only one 8-bit channel is used per pixel rather than three.