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===converting color (bit depth)=== convert an image into monochrome (1 bit depth) image: 2color values (b/w) convert myimage.jpg -colorspace gray -depth 1 out.png (2 bit depth) image: 4 color values convert myimage.jpg -colorspace gray -depth 2 out.png (3 bit depth) image: 8 color values convert myimage.jpg -colorspace gray -depth 3 out.png (4 bit depth) image: 16 color values convert myimage.jpg -colorspace gray -depth 4 out.png (8 bit depth) image: 256 color values convert myimage.jpg -colorspace gray -depth 4 out.png How can we be certain about this? How do can we see the grid that forms a bitmap image? * magnify any digital screen * a Plain-text bitmap: where you can read each pixel: X PixMap (XPM) [https://en.wikipedia.org/wiki/X_PixMap X PixMap (XPM)] is a plain-text bitmap image format, where each color is assigned a character, which is mapped onto the text space. convert myimage.jpg out.xpm <source lang="c"> /* XPM */ static char *output[] = { /* columns rows colors chars-per-pixel */ "50 73 2 1 ", " c black", ". c white", /* pixels */ " ", " ", " ", " ", " ................ ", " ...... . .. . . ....... ", " .. . . ... ", " . . .. . . .. ", " .. . . . . . . . ", " . . . . . . . .. ", " . . . . . . . ", " ... .. . .. ", " ... .. . ... ", " .. . ", " . .. ", " .. . ", " . .. ", " ... . . ", " . . . ", " .. . ", " .. . . . . ", " . . . ", " .. . ..... . ", " . .. .. . ", " . . .. . . ", " . .. . .. ", " .. . . . ..... ", " . ... . . . ", " . . .... .. . .. ", " . .. .... . . ", " . . . . .... ", " . . . .. ... ", " . . . .. ", " .. . . . . ", " . . .. . . ", " . .. .. .. .. ", " .. ... ... . ", " .. .. ", " . . . . . ", " . . .. . ", " . . .... . . ", " . .. ... . .. .. ", " .. . .. ..... . .. . ... . ", " . ... .. .... .... . ", " . ..... ...... ...... . ", " .. . ..... . ......... ... . ", " .. ......... .. . ...... . ", " . .. .................... ", " . .. . ............... . ", " . .. .. ............. . ", " . .. . . ..... . ", " ... . ... . .. ...... . ", " ... . ............. . ", " .. . .. . ", " ... .. ", " ... . . .. ", " .. . . ", " .. . ", " .... .. ", " ..... .... ", " ..... ", " ", " . ", " .. . ... ", " ... .. .. ... .. .. ...... ... ", " ............................ .. ", " ...... ................. ... . ", " ...... ... ... ..... .... .. . ", " .. ", " . ", " ", " ", " " }; </source> {{Youtube|UBX2QQHlQ_I}}
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