Re: ⎕PNG

[Chris Moller]

    Very cool!

On 9/21/22 07:49, Dr. Jürgen Sauermann wrote:

>       
>       Hi,
>         
>         I would like to announce a new GNU APL feature: ⎕PNG
>         
>         PNG stands for "Portable Network Graphics" and is a file format,
>         standardized
>         in RFC 2083, for (still) images that is, among several other use
>         cases, also
>         directly understood by web browsers.
>         
>         Unlike some of the other image file formats around, the PNG file
>         format
>         has no strings attached, such as patents or copyrights. This was
>         one of the
>         reasons for choosing it in GNU APL.
>         
>         While APL appears to be the perfect choice for manipulating the
>         large pixel
>         arrays of images, this is not the case for the files on disc
>         from which the pixel
>         arrays are read or eventually stored. ⎕PNG tries to close this
>         gap.
>         
>         ⎕PNG is comprised of three simple sub-function for:
>         
>         1. reading a .png file into an APL array of pixels,
>         2. displaying such an array in a GTK window on the screen, and
>         3. writing a (supposedly somehow manipulated) pixel array into a
>         .png file.
>         
>         The main work in the conversions above is actually provided by libpng
>         (see
>         www.libpng.org) therefore
>         ⎕PNG is merely a lightweight wrapper around
>         libpng. ⎕PNG is supposed to support all file variants
>         (colour and grayscale,
>         different pixel resolutions from 1 to 16 bits, with or without
>         alpha channel),
>         on input and most (= all but pixel arrays using colour palettes)
>         on output.
>         
>         SVN 1589, see also info apl section 2.32 for
>         details.
>         
>         Enjoy,
>         Jürgen
>         
>         
>         
>

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