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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...

   Making an image that was incorrectly saved as JPEG fit for saving as PNG. Suppose you have a map for an island that was inadvertently saved as JPEG. Looks OK, if a bit fuzzy. 1. In your bitmap graphics editor, set your fuzzy selection ("magic wand") tool so that it only will select pixels of exactly the same color. (Here: Threshold = 0) 2.

3. Wikipedia:Preparing images for upload - Wikipedia

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

   There are 4 basic choices for image file formats : SVG for simple diagrams (especially those that need to be scaled). JPEG for photographic images. GIF for animated images. PNG for everything else. While some formats offer multiple compression systems, in general the format and the compression system are tied together.

4. Image file format - Wikipedia

   en.wikipedia.org/wiki/Image_file_format

   Image file format. An image file format is a file format for a digital image. There are many formats that can be used, such as JPEG, PNG, and GIF. Most formats up until 2022 were for storing 2D images, not 3D ones. The data stored in an image file format may be compressed or uncompressed. If the data is compressed, it may be done so using lossy ...

5. PNG - Wikipedia

   en.wikipedia.org/wiki/PNG

   A PNG file contains a single image in an extensible structure of chunks, encoding the basic pixels and other information such as textual comments and integrity checks documented in RFC 2083. [7] PNG files have the ".png" file extension and the "image/png" MIME media type. [8] PNG was published as an informational RFC 2083 in March 1997 and as ...

6. APNG - Wikipedia

   en.wikipedia.org/wiki/APNG

   The logo of APNG Assembler, free software to create APNG images Mozilla Firefox added support for APNG in version 3 trunk builds on March 23, 2007. However, because libpng is the PNG Group's reference implementation of the official specification, APNG support can never be supported in the main libpng distribution so long as it remains unratified by the Group.

7. Transparency (graphic) - Wikipedia

   en.wikipedia.org/wiki/Transparency_(graphic)

   Transparency in PDF. Starting with version 1.4 of the PDF standard (Adobe Acrobat version 5), transparency (including translucency) is supported. Transparency in PDF files allows creators to achieve various effects, including adding shadows to objects, making objects semi-transparent and having objects blend into each other or into text.