How to convert a PNG to BGR 565 format using ImageMagick -

i'm trying use image magick convert png file bgr 565 bitmap image. i've done fair amount of research , haven't been able come answer. can me out?

compile c program , install in search path "rgbtobgr565"

/* rgbtobgr565 - convert 24-bit rgb pixels 16-bit bgr565 pixels    written in 2016 glenn randers-pehrson <glennrp@users.sf.net>    extent possible under law, author has dedicated copyright   , related , neighboring rights software public domain   worldwide. software distributed without warranty.   see <http://creativecommons.org/publicdomain/zero/1.0/>.     use imagemagick or graphicsmagick convert 24-bit rgb pixels   16-bit bgr565 pixels, e.g.,        magick file.png -depth 8 rgb:- | rgbtobgr565 > file.bgr565    note 16-bit pixels written in network byte order (most   significant byte first), blue in significant bits ,   red in least significant bits.    changlog:   jan 2017: changed bgr565 int unsigned short (suggested              steven valsesia) */  #include <stdio.h> int main() {     int red,green,blue;     unsigned short bgr565;     while (1) {         red=getchar(); if (red == eof) return (0);         green=getchar(); if (green == eof) return (1);         blue=getchar(); if (blue == eof) return (1);         bgr565 = (unsigned short)(red * 31.0 / 255.0) |                  (unsigned short)(green * 63.0 / 255.0) << 5 |                  (unsigned short)(blue * 31.0 / 255.0) << 11;             putchar((bgr565 >> 8) & 0xff);             putchar(bgr565 & 0xff);         }     } 

then run

magick file.png -depth 8 rgb:- | rgbtobgr565 > file.bgr565 

for completeness, here program converting bgr565 pixels rgb:

/* bgr565torgb - convert 16-bit bgr565 pixels 24-bit rgb pixels    written in 2016 glenn randers-pehrson <glennrp@users.sf.net>    extent possible under law, author has dedicated copyright   , related , neighboring rights software public domain   worldwide. software distributed without warranty.   see <http://creativecommons.org/publicdomain/zero/1.0/>.     use imagemagick or graphicsmagick convert 16-bit bgr565 pixels   24-bit rgb pixels, e.g.,        bgr565torgb < file.bgr565 > file.rgb       magick -size wxh -depth 8 file.rgb file.png  */  #include <stdio.h> int main() {     int rgbhi,rgblo,red,green,blue;     while (1) {         rgbhi=getchar(); if (rgbhi == eof) return (0);         rgblo=getchar(); if (rgblo == eof) return (1);         putchar((rgblo & 0x1f) << 3 | (rgblo & 0x14) >> 3 );         putchar((rgbhi & 0x07) << 5 |                 (rgblo & 0xe0) >> 3 |                 (rgbhi & 0x06) >> 1);         putchar((rgbhi & 0xe0) | (rgbhi >> 5) & 0x07);     } }