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  2. 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.

  3. PNG - Wikipedia

    en.wikipedia.org/wiki/PNG

    On small images, GIF can achieve greater compression than PNG (see the section on filesize, below). On most images, except for the above case, a GIF file has a larger size than an indexed PNG image. PNG gives a much wider range of transparency options than GIF, including alpha channel transparency.

  4. Netpbm - Wikipedia

    en.wikipedia.org/wiki/Netpbm

    The first line is either the ASCII text "PF", for a color file, or "Pf", for a grey-scale file. The next ASCII text line contains the width and height, separated by the space character hex 20 or sometimes with hex 0A (resulting in four lines). After each line a white space character hex 0A is written and not the Windows/DOS CR/LF combination.

  5. Help:Visual file markup - Wikipedia

    en.wikipedia.org/wiki/Help:Visual_file_markup

    The alt text for an imagemap region is always the same as its title text; the alt text for the overall image is given in the first line of the imagemap's markup. The underlying image's native dimensions are 3916 × 1980, and the coordinates are given in these dimensions rather than in the 300px resizing.

  6. JPEG - Wikipedia

    en.wikipedia.org/wiki/JPEG

    The most common filename extensions for files employing JPEG compression are .jpg and .jpeg, though .jpe, .jfif and .jif are also used. [48] It is also possible for JPEG data to be embedded in other file types – TIFF encoded files often embed a JPEG image as a thumbnail of the main image; and MP3 files can contain a JPEG of cover art in the ...

  7. 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.

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    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  9. Comparison of graphics file formats - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_graphics...

    PNG.png image/png Gecko 1.9 and Opera: Yes Apple Icon Image: Apple Inc..icns macOS: ART: AOL.art ASCII art.txt, .ansi, .text text/vnd.ascii-art Supported by GIMP: AutoCAD DXF: Drawing Interchange Format Autodesk.dxf image/vnd.dxf ARW: Sony Alpha RAW Sony: TIFF .arw AVIF: AV1 Image File Format Alliance for Open Media (AOMedia) AV1.avif image ...