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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. PNG - Wikipedia

   en.wikipedia.org/wiki/PNG

   PNG files vary in size due to a number of factors: color depth Color depth can range from 1 to 64 bits per pixel. ancillary chunks PNG supports metadata—this may be useful for editing, but unnecessary for viewing, as on websites. interlacing As each pass of the Adam7 algorithm is separately filtered, this can increase file size. [54] filter

4. Wikipedia:Extended image syntax - Wikipedia

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

   With an operand, e.g. thumb=Example.png, the operand names an image that is used as the thumbnail, ignoring any size specification. frame Preserve the original image size, and put a box around the image. Show any caption below the image. Float the image on the right unless overridden with the location attribute.

5. Wikipedia:Preparing images for upload - Wikipedia

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

   A truecolour PNG can often be converted to indexed mode without changing the look of the image, while saving on file size. (See color depth for information on indexed mode and truecolour.) It is normal for image editing programs to produce poor PNG compression, even when run with their maximum compression choices.

6. Wikipedia:Graphics tutorials - Wikipedia

   en.wikipedia.org/wiki/Wikipedia:Graphics_tutorials

   PNGCrush - Old tried and true program that reduces PNG sizes using multiple zlib compression trials on disk. OptiPNG - Essentially a newer version of PNGCrush, it economizes the trial (reducing from 100s of short ones to a maximum of 7 longer ones) and does everything in memory.

7. Help:Pictures - Wikipedia

   en.wikipedia.org/wiki/Help:Pictures

   Although upright=1.1 and 240px do the job equally well for the common case where the default width is 220 pixels, many of the users who set the default width to 300 pixels to work better with their high-resolution screens will be annoyed with 200px because it will make the picture a third smaller than their preferred size.