mapping an 8bit palette?

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Socoder -> Art and Sound -> mapping an 8bit palette?
Mon, 06 Aug 2007, 06:23
spinal	heres something thats been bothering me for all of two hours now, For my current DS project I want to use a single 8bit palette, so I decided on the standard 'web safe' 216 colour. now I'm stuck on how to use it. I have the colours mapped to a single array, pal[0]=black pal[215]=white pal[5]=red pal[30]=green pal[180=blue etc. like this - I want to access it something like- Colour = Red + (Green * something) + (Blue * something) I'm sure this is possible, but I can't quite get my head around it... Can anyone help? \|edit\| I realize this drops my colour accuracy down to 6:6:6, but I get a better range of colours. -=-=- Check out my excellent homepage!
Mon, 06 Aug 2007, 06:55
Jayenkai	; 0,0,0 = 0 0 0 ; 0,0,6 = 31 0 0 ; 0,6,0 = 0 31 0 ; 0,6,6 = 31 31 0 ; 6,0,0 = 0 0 31 ; 6,0,6 = 31 0 31 ; 6,6,0 = 0 31 31 ; 6,6,6 = 31 31 31 ;Red = X coord ;Green = Y Coord ;Blue = "Layer" ;.... ;Hmmm.. Graphics 800,600,32,2 x=0 y=0 For n=0 To 215 DebugLog n+":"+Col(n,1)+","+col(n,2)+","+Col(n,3) col(n):Rect x,y,8,8,2 x=x+8:If x=68 Then x=0:y=y+8 DebugLog n+"="+GetCol(ColorRed(),ColorGreen(),ColorBlue()) Next Function Col(N,ReturnCol=0) R=(N) Mod 6 G=(N/6) Mod 6 B=(N/36) Mod 6 If ReturnCol=0 Then Color R50,G50,B50 If ReturnCol=1 Then Return R If ReturnCol=2 Then Return G If ReturnCol=3 Then Return B End Function Function GetCol(r,g,b) TopVal=255 rgb=0 rgb=rgb+(((b6)/TopVal)36)+(((g6)/TopVal)6)+(((r*6)/TopVal)) Return rgb End Function --v Tada! You should be able to tweak this for 8-bit/DS/C usage. -=-=- ''Load, Next List!''
Tue, 07 Aug 2007, 04:53
spinal	HeHe it popped into my head while I was at work. I need to drop mey R,G,B values from 0-31 down to 0-5, dividing by5 will do this. then index= R+(G6)+(B30) I was only after the 3rd-last line -=-=- Check out my excellent homepage!