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Line 1,220: </pre> =={{header\|RPL}}== RPL was designed for black-and-white LCD screens. The <code>PIX?</code> instruction returns 1 if the designated pixel is black - actually dark gray or blue, depending on the model - and 0 if it's not. (10,10) PIX? <code>PIX?</code> was introduced in 1990 with the HP-48. On previous machines (HP-28C/S), the only way to test a pixel was to convert the status of the 131x32 LCD matrix into a 548-character string using the <code>LCD→</code> command, and then test the appropriate bit of the appropriate character. =={{header\|Ruby}}== This example requires ImageMagick >= 6.2.10 (works on X11, unsure about other platforms).

Color of a screen pixel (view source)