如何读出BMP文件的某一pixel的颜色值? 并判断这个pixel是否为红色.(100分)

K

kevinfu

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• 2001-02-09

• #1

我用Api中的Getpixel读出来的总是$FFFFFFFF,为什么?

 

C

Chenlili

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• 2001-02-09

• #2

var <br>&nbsp; &nbsp;rx,gx,bx:integer; <br>&nbsp; &nbsp;pchar; <br>&nbsp; &nbsp;c:byte; <br>begin <br>bitmap.handletype:=bmDIB; <br>bitmap.PixelFormat:=pf24bit; <br>for i:=0 to bitmap.height-1 do <br>&nbsp; begin <br>&nbsp; p:=bitmap.ScanLine; <br>&nbsp; for j:=1 to bitmap.width do <br>&nbsp; &nbsp; begin <br>&nbsp; &nbsp; c:=integer(p^)*rx+integer((p+1)^)*gx+integer((p+2)^)*bx; <br>&nbsp; &nbsp; &nbsp; &nbsp; p^:=chr(c); <br>&nbsp; &nbsp; (p+1)^:=chr(c); <br>&nbsp; &nbsp; (p+2)^:=chr(c); <br>&nbsp; &nbsp; inc(p,3); <br>&nbsp; &nbsp; end; <br>&nbsp; end;

 

王

王江

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• 2001-02-09

• #3

if bitmap.canvas.pixel[x,y]= clred then 就行了

 

吕

吕雪松

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• 2001-02-09

• #4

还可以用GetRValue,GetGValue,GetBValue分解颜色中的RGB值。

 

K

kevinfu

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• 2001-03-23

• #5

多人接受答案了。