用VB如何把24位颜色BMP文件转成8位颜色!
用VB如何把24位颜色BMP文件转成8位颜色! 问题点数：30、回复次数：2Top
1 楼daisy8675（莫依 沉迷）回复于 2006-03-01 23:52:02 得分 0
试一下,我也不知道是否满足要求:)
Option Explicit
Private Declare Function GetPixel Lib "gdi32" _
(ByVal hdc As Long, ByVal x As Long, ByVal Y As Long) As Long
Private Declare Function SetPixelV Lib "gdi32" _
(ByVal hdc As Long, ByVal x As Long, _
ByVal Y As Long, ByVal crColor As Long) As Long
Private tmpPic As Picture
Private Sub Form_Load()
Picture1.ScaleMode = 3
Picture1.AutoRedraw = True
Picture1.Picture = LoadPicture(App.Path & "\55.bmp")
Set tmpPic = Picture1.Picture
End Sub
Private Sub Command1_click()
Dim width5 As Long, heigh5 As Long, rgb5 As Long
Dim hdc5 As Long, i As Long, j As Long
Dim bBlue As Long, bRed As Long, bGreen As Long
Dim Y As Long
width5 = Picture1.ScaleWidth
heigh5 = Picture1.ScaleHeight
hdc5 = Picture1.hdc
For i = 1 To width5
For j = 1 To heigh5
rgb5 = GetPixel(hdc5, i, j)
bBlue = Blue(rgb5) '获得兰色值
bRed = Red(rgb5) '获得红色值
bGreen = Green(rgb5) '获得绿色值
'将三原色转换为灰度
Y = (9798 * bRed + 19235 * bGreen + 3735 * bBlue) \ 32768
'将灰度转换为RGB
rgb5 = RGB(Y, Y, Y)
SetPixelV hdc5, i, j, rgb5
Next j
Next i
Set Picture1.Picture = Picture1.Image
End Sub
Private Function Red(ByVal mlColor As Long) As Long
'从RGB值中获得红色值
Red = mlColor And &HFF
End Function
Private Function Green(ByVal mlColor As Long) As Long
'从RGB值中获得绿色值
Green = (mlColor \ &H100) And &HFF
End Function
Private Function Blue(ByVal mlColor As Long) As Long
''从RGB值中获得蓝色值
Blue = (mlColor \ &H10000) And &HFF
End Function
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2 楼rainstormmaster（暴风雨 v2.0）回复于 2006-03-02 08:21:24 得分 0
看http://topic.csdn.net/t/20030317/00/1538596.html里我的回复Top
