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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. JPEG Network Graphics - Wikipedia

    en.wikipedia.org/wiki/JPEG_Network_Graphics

    JPEG Network Graphics (JNG, / ˈ dʒ ɪ ŋ /) is a JPEG-based graphics file format which is closely related to PNG: it uses the PNG file structure (with a different signature) as a container format to wrap JPEG-encoded image data. JNG was created as an adjunct to the MNG animation format, but may be used as a stand-alone format. JNG files embed ...

  4. Wikipedia:Preparing images for upload - Wikipedia

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

    While some formats offer multiple compression systems, in general the format and the compression system are tied together. Other image formats should be avoided in most cases: BMP - Images are uncompressed, resulting in larger file sizes. Should usually be converted to PNG. TIFF - Should usually be converted to PNG or JPEG as discussed above.

  5. 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 ...

  6. Image file format - Wikipedia

    en.wikipedia.org/wiki/Image_file_format

    The PNG file format supports 8-bit (256 colors) paletted images (with optional transparency for all palette colors) and 24-bit truecolor (16 million colors) or 48-bit truecolor with and without alpha channel – while GIF supports only 8-bit palettes with a single transparent color. Compared to JPEG, PNG excels when the image has large ...

  7. QOI (image format) - Wikipedia

    en.wikipedia.org/wiki/QOI_(image_format)

    The Quite OK Image Format (QOI) is a specification for lossless image compression of 24-bit (8 bits per color RGB) or 32-bit (8 bits per color with 8-bit alpha channel RGBA) color raster (bitmapped) images, invented by Dominic Szablewski and first announced on 24 November 2021.

  8. Raster graphics - Wikipedia

    en.wikipedia.org/wiki/Raster_graphics

    The size of each square pixel, known as the resolution or support, is constant across the grid. Raster or gridded data may be the result of a gridding procedure. A single numeric value is then stored for each pixel. For most images, this value is a visible color, but other measurements are possible, even numeric codes for qualitative categories.

  9. International Image Interoperability Framework - Wikipedia

    en.wikipedia.org/wiki/International_Image...

    The IIIF Image API specifies a web service that returns an image in response to a standard HTTP or HTTPS request. The URI can specify the region, size, rotation, quality characteristics and format of the requested image. A URI can also be constructed to request basic technical information about the image to support client applications. [5]