VB DIB 如何得到某点RGB值？
form1
Private Sub Command_Click()
With Picture1
.AutoRedraw = True
.ScaleMode = 3
.BorderStyle = 0
DibGet .hdc, 0, 0, .ScaleWidth, .ScaleHeight
End With
With Picture2
.AutoRedraw = True
.ScaleMode = 3
.BorderStyle = 0
.Width = Picture1.Width
.Height = Picture1.Height
End With
CopyData InPutHei, InPutWid
Picture2.AutoRedraw = True
DIBPut Picture2.hdc
Picture2.Refresh
End Sub
module1
Option Explicit
'删除一个DC
Private Declare Function DeleteDC Lib "gdi32" (ByVal hdc As Long) As Long
'删除一个对象
Private Declare Function DeleteObject Lib "gdi32" (ByVal hObject As Long) As Long
'获得指定类型的当前选定对象
Private Declare Function GetCurrentObject Lib "gdi32" (ByVal hdc As Long, ByVal uObjectType As Long) As Long
'获取DIB
Private Declare Function GetDIBits Lib "gdi32" (ByVal aHDC As Long, ByVal hBitmap As Long, ByVal nStartScan As Long, ByVal nNumScans As Long, lpBits As Any, lpBI As BitMapInfo, ByVal wUsage As Long) As Long
'获取系统时间
Private Declare Function timeGetTime Lib "winmm.dll" () As Long
Public Declare Function SetDIBitsToDevice Lib "gdi32" (ByVal hdc As Long, ByVal x As Long, ByVal y As Long, ByVal dx As Long, ByVal dy As Long, ByVal SrcX As Long, ByVal SrcY As Long, ByVal Scan As Long, ByVal NumScans As Long, Bits As Any, BitsInfo As BitMapInfo, ByVal wUsage As Long) As Long
Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (pDest As Any, pSrc As Any, ByVal ByteLen As Long)
Private Declare Function SetPixel Lib "gdi32" (ByVal hdc As Long, ByVal x As Long, ByVal y As Long, ByVal crColor As Long) As Long
Private Const Bits As Long = 32 '颜色深度，这里把所有图像都按照32位来处理
'文件信息头——BITMAPINFOHEADER
Private Type BitMapInfoHeader
biSize As Long '位图大小
biWidth As Long '宽度
biHeight As Long '长度
biPlanes As Integer '
biBitCount As Integer '信息头长度
biCompression As Long '压缩方式
biSizeImage As Long
biXPelsPerMeter As Long
biYPelsPerMeter As Long
biClrUsed As Long
biClrImportant As Long
End Type
'颜色表
Private Type RGBQuad
rgbBlue As Byte
rgbGreen As Byte
rgbRed As Byte
'rgbReserved As Byte
End Type
'位图信息头
Private Type BitMapInfo
bmiHeader As BitMapInfoHeader
bmiColors As RGBQuad
End Type
Public Done As Boolean '用于标记一个过程是否结束
Public TimeGet As Long '用于记录输入过程处理所花费的时间
Public TimePut As Long '用于记录输出过程处理所花费的时间
Dim ColVal() As Byte '用于存放从DIB输入的像素值
Dim ColOut() As Byte '用于存放向DIB输出的像素值
Public InPutHei As Long '用于记录输入图像的高度
Public InPutWid As Long '用于记录输入图像的宽度
Dim bi24BitInfo As BitMapInfo '定义BMP信息
Public Sub DibGet(ByVal IdSource As Long, XBegin As Long, ByVal YBegin As Long, ByVal XEnd As Long, ByVal YEnd As Long)
Dim iBitmap As Long
Dim iDC As Long
Dim i As Long
Dim w As Long
Dim H As Long
On Error GoTo ErrLine
Done = False
TimeGet = timeGetTime '获取系统时间
InPutWid = XEnd - XBegin
InPutHei = YEnd - YBegin
w = InPutWid + 1
H = InPutHei + 1
i = (Bits \ 8) - 1
ReDim ColVal(i, InPutWid, InPutHei)
With bi24BitInfo.bmiHeader
.biBitCount = Bits
.biCompression = 0&
.biPlanes = 1
.biSize = Len(bi24BitInfo.bmiHeader)
.biWidth = w
.biHeight = H
End With
iBitmap = GetCurrentObject(IdSource, 7&)
GetDIBits IdSource, iBitmap, 0&, H, ColVal(0, 0, 0), bi24BitInfo, 0&
DeleteObject iBitmap
Done = True
TimeGet = timeGetTime - TimeGet
Exit Sub
ErrLine:
MsgBox "错误号：" & Err.Number & "：" & Err.Description
End Sub
Public Sub DIBPut(ByVal IdDestination As Long)
Dim w As Long
Dim H As Long
Dim LineBytes As Long
On Error GoTo ErrLine
Done = False
TimePut = timeGetTime
w = InPutWid + 1
H = InPutHei + 1
With bi24BitInfo.bmiHeader
.biWidth = w
.biHeight = H
LineBytes = ((w * Bits + 31) And &HFFFFFFE0) \ 8
.biSizeImage = LineBytes * H
End With
'SetDIBitsToDevice IdDestination, 0, 0, W, H, 0, 0, 0, H, ColOut(0, 0, 0), bi24BitInfo.bmiHeader, 0
SetDIBitsToDevice IdDestination, 0, 0, w, H, 0, 0, 0, H, ColOut(0, 0, 0), bi24BitInfo, 0
Done = True
TimePut = timeGetTime - TimePut
Exit Sub
ErrLine:
MsgBox Err.Description
End Sub
Public Sub CopyData(ByVal w As Long, ByVal H As Long)
Dim Length As Long
Dim i As Long
Dim L As Long
i = Bits \ 8
L = i - 1
Length = (w + 1&) * (H + 1&) * i
ReDim ColOut(L, w, H)
CopyMemory ColOut(0, 0, 0), ColVal(0, 0, 0), Length
End Sub
上面的是整图复制那么怎么
得到某点RGB值？
[解决办法]
ColOut()
GetPixel()
[解决办法]
楼上说的没错
GetPixel
如果再想得到具体的R，G，B值，需要GetRValue,GetBValue.....这样的函数。（不过这几个函数在VC中看到的，不能保证VB中有）
[解决办法]
楼上的貌似弄复杂了
[解决办法]
哈哈.....
[解决办法]
你既然已经调用DibGet得到了整个图片的象素，那么ColVal(0~2,X,Y)中存放的就是坐标X,Y处的R,G,B分量了。
既然花了时间抄程序，为何不肯多花一点点时间稍微研究一下代码呢？
http://blog.csdn.net/wallescai/
[解决办法]
up
[解决办法]
【CBM666 的RGB取色加渐变】
http://blog.csdn.net/cbm666/archive/2008/02/27/2125990.aspx
[解决办法]
楼主的代码挺不错，改正了网上流传的错误代码，谢谢！
[解决办法]
不错，学习了
