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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...

    Deselect any part that is supposed to remain transparent, and then shrink the selection by one. Use the color picker and fill with the background color. Either way, use the color picker to select the foreground color (being sure sample an average) and select the background color with your favorite tool and press delete.

  3. PNG - Wikipedia

    en.wikipedia.org/wiki/PNG

    5.01 prints palette images with black (or dark gray) backgrounds under Windows 98, sometimes with radically altered colors. [77] 6.0 fails to display PNG images of 4097 or 4098 bytes in size. [78] 6.0 cannot open a PNG file that contains one or more zero-length IDAT chunks. This issue was first fixed in security update 947864 (MS08-024).

  4. WebP - Wikipedia

    en.wikipedia.org/wiki/WebP

    WebP is a raster graphics file format developed by Google intended as a replacement for JPEG, PNG, and GIF file formats. It supports both lossy and lossless compression, [8] as well as animation and alpha transparency.

  5. Transparency (graphic) - Wikipedia

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

    GIF animation of an Apollonian sphere packing with transparent background. Transparency in computer graphics is possible in a number of file formats.The term "transparency" is used in various ways by different people, but at its simplest there is "full transparency" i.e. something that is completely invisible.

  6. Wikipedia : Graphics Lab/Resources/PDF conversion to SVG

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

    To convert a pdf: Convert the first page of a PDF file with pdf2svg file.pdf file.svg. To extract all pages of a multiple-page PDF use pdf2svg file.pdf output-%02d.svg all. This generates output files output-00.svg, output-01.svg, etc. where the pattern "%02d" is replaced by the respective two-digit page numbers.

  7. Alpha compositing - Wikipedia

    en.wikipedia.org/wiki/Alpha_compositing

    A color spectrum image with an alpha channel that falls off to zero at its base, where it is blended with the background color.. In computer graphics, alpha compositing or alpha blending is the process of combining one image with a background to create the appearance of partial or full transparency. [1]