PALETTE

The PALETTE statement can swap color settings, set colors to default or set the red, green and blue color components of palette colors.

Syntax

PALETTE [attribute%, red% + (green% * 256) + (blue% * 65536)]

PALETTE [existingAttribute%, newAttribute%]

red%, green% and blue% values can range from 0 to 63. Many color shades are possible in non-DAC color attributes.
If the red%, green% and blue% color intensity settings are all the same value the resulting color is a shade of grey.
A swap is often used with DAC color attributes that cannot change RGB settings. Only the RGB color settings are swapped from original existingAttribute% to newAttribute%. Screens 0 thru 9 support swaps. Screen 10 supports up to attribute 8 only.
PALETTE without any value sets any changed RGB settings back to the default color settings, including DAC colors.
PALETTE USING can be used when color intensity values are stored in an array.
QB64 implements the _PALETTECOLOR statement to provide extended palette functionality.

Screens 0, 7 and 9 (DAC) colors could not be changed using the first syntax, but the program could use OUT to change intensity settings of attributes 1 thru 5.

Example: Displaying all 64 DAC color hues as backgrounds in SCREEN 9 using a PALETTE swap.

SCREEN 9 ' background is default black LOCATE 20, 33: PRINT "Press any Key!" FOR i = 1 TO 64 a$ = INPUT$(1) ' wait for a keypress PALETTE 0, i NEXT

Note: Other attributes (1 to 15) can also be swapped for DAC foreground colors.