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52 lines
2.3 KiB
Plaintext
52 lines
2.3 KiB
Plaintext
{{DISPLAYTITLE:_PALETTECOLOR (function)}}
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The [[_PALETTECOLOR (function)|_PALETTECOLOR]] function is used to return the 32 bit attribute color setting of an image or screen page handle's palette.
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{{PageSyntax}}
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: {{Parameter|color32Value&}} = [[_PALETTECOLOR (function)|_PALETTECOLOR]]({{Parameter|attributeNumber%}}, {{Parameter|imgHandle&}})
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{{PageDescription}}
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* {{Parameter|attributeNumber%}} is the color attribute value from 0 to 255 for 1, 4 or 8 bit images.
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* {{Parameter|imgHandle&}} is the image handle being read for color data. Zero can be used to read the current screen mode palette.
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* Returns the 32 bit color value to be used by the 32 bit RGB functions.
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* For 32 bit images send the _PALETTECOLOR return value to [[_RED32]], [[_GREEN32]] and [[_BLUE32]] functions to get the red, green, and blue intensity values.
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* '''Although 32 bit palette values are returned, the function cannot be used with 32 bit images or screen modes.'''
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{{PageExamples}}
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''Example:'' How _PALETTECOLOR works on 32 bit RGB compared to a 4 BPP(SCREEN 12) Qbasic procedure.
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{{CodeStart}} '' ''
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SCREEN 12 'can use any Qbasic legacy screen mode
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DIM RGB(0 TO 47) AS INTEGER 'color intensity array
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FOR c& = 0 TO 15
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'OUT &H3C7, c& 'set color attribute to read
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value32& = {{Cl|_PALETTECOLOR (function)|_PALETTECOLOR}}(c&, 0) 'sets color value to read of an image page handle.
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'red% = INP(&H3C9)
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red% = {{Cl|_RED32}}(value32&)
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'green% = INP(&H3C9)
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green% = {{Cl|_GREEN32}}(value32&)
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'blue% = INP(&H3C9)
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blue% = {{Cl|_BLUE32}}(value32&)
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RGB(c& * 3) = red%: RGB((c& * 3) + 1) = green%: RGB((c& * 3) + 2) = blue%
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NEXT
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FOR i = 0 TO 47 STEP 3
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RGBval$ = LTRIM$(STR$(RGB(i))) + "," + STR$(RGB(i + 1)) + "," + STR$(RGB(i + 2)) + ")"
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PRINT "Color"; i / 3, "_RGB(" + RGBval$;
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PRINT
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NEXT
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END '' ''
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{{CodeEnd}}
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:''Explanation:'' To save a bitmap or other image you need the RGB color settings or the colors will look all wrong. You can store that information into a larger image array and [[GET (graphics statement)|GET]] the image AFTER the color settings. Just GET the image starting at Array(48).
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{{PageSeeAlso}}
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* [[_PALETTECOLOR]] (statement)
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* [[_NEWIMAGE]], [[_LOADIMAGE]]
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* [[SAVEIMAGE]] (example code)
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{{PageNavigation}}
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