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2. Wikipedia:Preparing images for upload - Wikipedia

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

   If you are converting an image with many colours (perhaps because somebody saved the original as a JPEG, avoid this) to a PNG, you may want to reduce the number of colours at the same time; see Wikipedia:How to reduce colors for saving a JPEG as PNG. An anti-aliased image may use more colours than you notice, because anti-aliasing smooths ...

3. Wikipedia:Manual of Style/Images - Wikipedia

   en.wikipedia.org/.../Images

   For this reason, PNG format files are usually preferred to the GIF format. For images with substantial editing, or for which further editing may be warranted, uploading a PNG as well as a JPEG is common (PNG is lossless compression, so repeatedly saving edits on a PNG will not result in loss of quality).

4. Wikipedia:Uploading images - Wikipedia

   en.wikipedia.org/wiki/Wikipedia:Uploading_images

   The preferred formats are JPEG for photographic images, SVG for drawings and line-art illustration, PNG for non-vector graphic iconic images, Ogg Vorbis for sound and Ogg Theora for video. Please name your files descriptively to avoid confusion (see below).

5. Comparison of graphics file formats - Wikipedia

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

   World Wide Web Consortium.png image/png General purpose Yes PNM: Portable Anymap File Format ASCII.pnm image/x-portable-anymap Yes PostScript: page description/scripting language, levels 1–3 Adobe.ps, .ps2, .ps3 printing/publishing industry standard format PPM: Portable Pixmap File Format ASCII.ppm image/x-portable-pixmap Very easy to understand.

6. Image file format - Wikipedia

   en.wikipedia.org/wiki/Image_file_format

   JPEG applies lossy compression to images, which can result in a significant reduction of the file size. Applications can determine the degree of compression to apply, and the amount of compression affects the visual quality of the result. When not too great, the compression does not noticeably affect or detract from the image's quality, but ...

7. File:Comparison between JPEG, JPEG 2000 and JPEG XR.png

   en.wikipedia.org/wiki/File:Comparison_between...

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