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这里所说的高细节并不是我们所说的HDR，也不是用浮点数进行纹理存储……而是在尽可能保证图片不变得“难看”的情况下把图片降级为256色（尤其是对于存储GIF图片非常具有利用价值）。Palette （或颜色表 Color Table ）。这个颜色表是如何得到的呢？有很多种方法：【C】八叉树算法：BMP颜色降级生成调色板的算法
亲测效果不好用，请大家不要用。
VERSION 5.00 Begin VB.Form frmMain Caption = "取得调色板" ClientHeight = 6465 ClientLeft = 120 ClientTop = 450 ClientWidth = 16440 LinkTopic = "frmMain" OLEDropMode = 1 'Manual ScaleHeight = 431 ScaleMode = 3 'Pixel ScaleWidth = 1096 StartUpPosition = 3 '窗口缺省 Begin VB.PictureBox picDither Align = 3 'Align Left BorderStyle = 0 'None Height = 6465 Left = 0 ScaleHeight = 431 ScaleMode = 3 'Pixel ScaleWidth = 457 TabIndex = 6 Top = 0 Visible = 0 'False Width = 6855 Begin VB.HScrollBar HSDither Height = 255 Left = 1440 Max = 0 TabIndex = 12 TabStop = 0 'False Top = 3000 Width = 2415 End Begin VB.PictureBox picColor4 AutoRedraw = -1 'True BackColor = &H00000000& BorderStyle = 0 'None Height = 495 Left = 1800 ScaleHeight = 33 ScaleMode = 3 'Pixel ScaleWidth = 33 TabIndex = 11 Top = 0 Visible = 0 'False Width = 495 End Begin VB.PictureBox picColor3 AutoRedraw = -1 'True BackColor = &H00000000& BorderStyle = 0 'None Height = 495 Left = 1200 ScaleHeight = 33 ScaleMode = 3 'Pixel ScaleWidth = 33 TabIndex = 10 Top = 0 Visible = 0 'False Width = 495 End Begin VB.PictureBox picColor2 AutoRedraw = -1 'True BackColor = &H00000000& BorderStyle = 0 'None Height = 495 Left = 600 ScaleHeight = 33 ScaleMode = 3 'Pixel ScaleWidth = 33 TabIndex = 9 Top = 0 Visible = 0 'False Width = 495 End Begin VB.PictureBox picColor1 AutoRedraw = -1 'True BackColor = &H00000000& BorderStyle = 0 'None Height = 495 Left = 0 ScaleHeight = 33 ScaleMode = 3 'Pixel ScaleWidth = 33 TabIndex = 8 Top = 0 Visible = 0 'False Width = 495 End Begin VB.PictureBox picResult AutoRedraw = -1 'True BackColor = &H00000000& BorderStyle = 0 'None Height = 495 Left = 2400 ScaleHeight = 33 ScaleMode = 3 'Pixel ScaleWidth = 33 TabIndex = 7 Top = 0 Visible = 0 'False Width = 495 End End Begin VB.PictureBox picRightPanel Align = 4 'Align Right BorderStyle = 0 'None Height = 6465 Left = 15345 ScaleHeight = 431 ScaleMode = 3 'Pixel ScaleWidth = 73 TabIndex = 0 Top = 0 Width = 1095 Begin VB.PictureBox picProgress BackColor = &H8000000C& Height = 255 Left = 0 ScaleHeight = 13 ScaleMode = 3 'Pixel ScaleWidth = 69 TabIndex = 14 Top = 4320 Width = 1095 Begin VB.CommandButton cmdProgress Enabled = 0 'False Height = 195 Left = 0 Style = 1 'Graphical TabIndex = 15 Top = 0 Width = 1035 End End Begin VB.CheckBox ChRandomPalette Caption = "产生随机调色板" Height = 615 Left = 0 Style = 1 'Graphical TabIndex = 13 Top = 3600 Width = 1095 End Begin VB.PictureBox picPal AutoRedraw = -1 'True BackColor = &H00000000& BorderStyle = 0 'None Height = 1095 Left = 0 ScaleHeight = 73 ScaleMode = 3 'Pixel ScaleWidth = 73 TabIndex = 5 Top = 2400 Width = 1095 End Begin VB.OptionButton OpDitherPic Caption = "抖动图" Enabled = 0 'False Height = 495 Left = 0 Style = 1 'Graphical TabIndex = 4 Top = 1920 Value = -1 'True Width = 1095 End Begin VB.OptionButton OpSrcPic Caption = "原图" Enabled = 0 'False Height = 495 Left = 0 Style = 1 'Graphical TabIndex = 3 Top = 1440 Width = 1095 End Begin VB.CommandButton cmdDither Caption = "抖动" Enabled = 0 'False Height = 615 Left = 0 TabIndex = 1 Top = 0 Width = 1095 End End Begin VB.PictureBox picSrcPic AutoRedraw = -1 'True AutoSize = -1 'True BorderStyle = 0 'None Height = 255 Left = 0 ScaleHeight = 255 ScaleWidth = 135 TabIndex = 2 Top = 0 Visible = 0 'False Width = 135 End End Attribute VB_Name = "frmMain" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = False '============================================================================== '作者：0xAA55 '论坛：http://www.0xaa55.com/ '版权所有 (C) 2013-2014 技术宅的结界 '请保留原作者信息，否则视为侵权。 '------------------------------------------------------------------------------ Option Explicit Private Const COLORS_MAX As Long = 256 Private Const COLORS_BITS As Long = 8 Private Const DIST_MAX As Long = 200000 Private Type RGBQUAD B As Byte G As Byte R As Byte X As Byte End Type Private Type BITMAPINFO24 biSize As Long biWidth As Long biHeight As Long biPlanes As Integer biBitCount As Integer biCompression As Long biSizeImage As Long biXPelsPerMeter As Long biYPelsPerMeter As Long biClrUsed As Long biClrImportant As Long End Type Private Type BITMAPINFOPAL biSize As Long biWidth As Long biHeight As Long biPlanes As Integer biBitCount As Integer biCompression As Long biSizeImage As Long biXPelsPerMeter As Long biYPelsPerMeter As Long biClrUsed As Long biClrImportant As Long Palette(COLORS_MAX - 1) As RGBQUAD End Type Private Declare Function CreateOctreePaletteFromHBITMAP Lib "..\Octree.dll" (ByVal hDC&, ByVal hBitmap&, ByVal Width&, ByVal Height&, ByVal MaxColors&, ByVal ColorBits&, P As RGBQUAD) As Long Private Declare Function GetBitmapPitch Lib "..\Octree.dll" (ByVal BitCount As Integer, ByVal Width As Long) As Long Private Declare Function GetDIBits Lib "gdi32.dll" (ByVal aHDC As Long, ByVal hBitmap As Long, ByVal nStartScan As Long, ByVal nNumScans As Long, lpBits As Any, lpBI As BITMAPINFO24, ByVal wUsage As Long) As Long Private Declare Function SetDIBits Lib "gdi32.dll" (ByVal aHDC As Long, ByVal hBitmap As Long, ByVal nStartScan As Long, ByVal nNumScans As Long, lpBits As Any, lpBI As BITMAPINFOPAL, ByVal wUsage As Long) As Long Private Const DIB_RGB_COLORS = 0 ' color table in RGBs Private Const DIB_PAL_COLORS = 1 ' color table in palette indices Dim BMIF24 As BITMAPINFO24 Dim BMIFPAL As BITMAPINFOPAL Dim PW&, PH& Dim LM() As Byte Dim QuitLoop As Boolean Dim SrcPixels() As Byte Dim Values1() As Byte Dim Values2() As Byte Dim Values3() As Byte Dim Values4() As Byte Dim Vec1R() As Long, Vec1G() As Long, Vec1B() As Long Dim Vec2R() As Long, Vec2G() As Long, Vec2B() As Long Dim Vec3R() As Long, Vec3G() As Long, Vec3B() As Long Dim Vec4R() As Long, Vec4G() As Long, Vec4B() As Long Private Const MaxDist As Double = 64 Private Const MaxDistSq As Double = MaxDist * MaxDist Private Const RefreshInterval As Single = 0.1 Dim ProgWidth As Single Sub DrawProgress(ByVal Prog As Double) cmdProgress.Left = (Prog - 1) * ProgWidth picProgress.Refresh End Sub Private Sub cmdDither_Click() Dim DestPixels() As Byte Dim Pitch1 As Long, Pitch2 As Long Dim X&, Y& Dim I&, LStart1& Dim L&, LStart2& Dim K&, DistanceSq As Long, NewDistSq As Long Dim RDiff As Long, GDiff As Long, BDiff As Long Dim Tm!, NTm! cmdDither.Enabled = False picDither.Visible = True picDither.Visible = True Form_Resize Pitch1 = GetBitmapPitch(24, PW) Pitch2 = GetBitmapPitch(8, PW) Erase Values1, Values2, Values3, Values4, SrcPixels Erase Vec1R, Vec1G, Vec1B Erase Vec2R, Vec2G, Vec2B Erase Vec3R, Vec3G, Vec3B Erase Vec4R, Vec4G, Vec4B ReDim SrcPixels(Pitch1 * PH - 1) ReDim DestPixels(Pitch2 * PH - 1) ReDim Values1(UBound(DestPixels)) ReDim Values2(UBound(DestPixels)) ReDim Values3(UBound(DestPixels)) ReDim Values4(UBound(DestPixels)) ReDim Vec1R(UBound(DestPixels)), Vec1G(UBound(DestPixels)), Vec1B(UBound(DestPixels)) ReDim Vec2R(UBound(DestPixels)), Vec2G(UBound(DestPixels)), Vec2B(UBound(DestPixels)) ReDim Vec3R(UBound(DestPixels)), Vec3G(UBound(DestPixels)), Vec3B(UBound(DestPixels)) ReDim Vec4R(UBound(DestPixels)), Vec4G(UBound(DestPixels)), Vec4B(UBound(DestPixels)) GetDIBits picSrcPic.hDC, picSrcPic.Image.Handle, 0, PH, SrcPixels(0), BMIF24, DIB_RGB_COLORS '============================================================================== '步骤1：取得最相近的颜色 '------------------------------------------------------------------------------ LStart1 = 0 LStart2 = 0 picColor1.Visible = True For Y = 0 To PH - 1 I = LStart1 L = LStart2 For X = 0 To PW - 1 DistanceSq = 255& * 255 * 3 For K = 0 To 255 RDiff = CLng(BMIFPAL.Palette(K).R) - SrcPixels(I + 2) GDiff = CLng(BMIFPAL.Palette(K).G) - SrcPixels(I + 1) BDiff = CLng(BMIFPAL.Palette(K).B) - SrcPixels(I + 0) NewDistSq = RDiff * RDiff + GDiff * GDiff + BDiff * BDiff If NewDistSq < DistanceSq And NewDistSq <= MaxDistSq Then Vec1R(L) = RDiff Vec1G(L) = GDiff Vec1B(L) = BDiff Values1(L) = K DestPixels(L) = K DistanceSq = NewDistSq End If Next I = I + 3 L = L + 1 Next NTm = Timer If NTm - Tm >= RefreshInterval Then Tm = NTm SetDIBits picColor1.hDC, picColor1.Image.Handle, 0, PH, DestPixels(0), BMIFPAL, DIB_RGB_COLORS picColor1.PaintPicture picSrcPic.Image, 0, 0, PW, PH - Y, 0, 0, PW, PH - Y DrawProgress Y / (PH - 1) picColor1.Refresh DoEvents If QuitLoop Then Exit For End If LStart1 = LStart1 + Pitch1 LStart2 = LStart2 + Pitch2 Next SetDIBits picColor1.hDC, picColor1.Image.Handle, 0, PH, DestPixels(0), BMIFPAL, DIB_RGB_COLORS DrawProgress 1 picColor1.Refresh '============================================================================== '步骤2：取得和上一步相反的颜色 '------------------------------------------------------------------------------ LStart1 = 0 LStart2 = 0 picColor2.Visible = True For Y = 0 To PH - 1 I = LStart1 L = LStart2 For X = 0 To PW - 1 DistanceSq = 255& * 255 * 3 Values2(L) = Values1(L) For K = 0 To 255 RDiff = CLng(BMIFPAL.Palette(K).R) - SrcPixels(I + 2) GDiff = CLng(BMIFPAL.Palette(K).G) - SrcPixels(I + 1) BDiff = CLng(BMIFPAL.Palette(K).B) - SrcPixels(I + 0) If RDiff * Vec1R(L) + GDiff * Vec1G(L) + BDiff * Vec1B(L) < 0 Then NewDistSq = RDiff * RDiff + GDiff * GDiff + BDiff * BDiff If NewDistSq < DistanceSq And NewDistSq <= MaxDistSq Then Vec2R(L) = RDiff Vec2G(L) = GDiff Vec2B(L) = BDiff Values2(L) = K DestPixels(L) = K DistanceSq = NewDistSq End If End If Next I = I + 3 L = L + 1 Next NTm = Timer If NTm - Tm >= RefreshInterval Then Tm = NTm SetDIBits picColor2.hDC, picColor2.Image.Handle, 0, PH, DestPixels(0), BMIFPAL, DIB_RGB_COLORS DrawProgress Y / (PH - 1) picColor2.Refresh DoEvents If QuitLoop Then Exit For End If LStart1 = LStart1 + Pitch1 LStart2 = LStart2 + Pitch2 Next SetDIBits picColor2.hDC, picColor2.Image.Handle, 0, PH, DestPixels(0), BMIFPAL, DIB_RGB_COLORS DrawProgress 1 picColor2.Refresh '============================================================================== '步骤3：取得和上两步相反的颜色 '------------------------------------------------------------------------------ LStart1 = 0 LStart2 = 0 picColor3.Visible = True For Y = 0 To PH - 1 I = LStart1 L = LStart2 For X = 0 To PW - 1 DistanceSq = 255& * 255 * 3 Values3(L) = Values2(L) For K = 0 To 255 RDiff = CLng(BMIFPAL.Palette(K).R) - SrcPixels(I + 2) GDiff = CLng(BMIFPAL.Palette(K).G) - SrcPixels(I + 1) BDiff = CLng(BMIFPAL.Palette(K).B) - SrcPixels(I + 0) If RDiff * Vec1R(L) + GDiff * Vec1G(L) + BDiff * Vec1B(L) < 0 And _ RDiff * Vec2R(L) + GDiff * Vec2G(L) + BDiff * Vec2B(L) < 0 Then NewDistSq = RDiff * RDiff + GDiff * GDiff + BDiff * BDiff If NewDistSq < DistanceSq And NewDistSq <= MaxDistSq Then Vec3R(L) = RDiff Vec3G(L) = GDiff Vec3B(L) = BDiff Values3(L) = K DestPixels(L) = K DistanceSq = NewDistSq End If End If Next I = I + 3 L = L + 1 Next NTm = Timer If NTm - Tm >= RefreshInterval Then Tm = NTm SetDIBits picColor3.hDC, picColor3.Image.Handle, 0, PH, DestPixels(0), BMIFPAL, DIB_RGB_COLORS DrawProgress Y / (PH - 1) picColor3.Refresh DoEvents If QuitLoop Then Exit For End If LStart1 = LStart1 + Pitch1 LStart2 = LStart2 + Pitch2 Next SetDIBits picColor3.hDC, picColor3.Image.Handle, 0, PH, DestPixels(0), BMIFPAL, DIB_RGB_COLORS DrawProgress 1 picColor3.Refresh '============================================================================== '步骤4：取得和上三步相反的颜色 '------------------------------------------------------------------------------ LStart1 = 0 LStart2 = 0 picColor4.Visible = True For Y = 0 To PH - 1 I = LStart1 L = LStart2 For X = 0 To PW - 1 DistanceSq = 255& * 255 * 3 Values4(L) = Values3(L) For K = 0 To 255 RDiff = CLng(BMIFPAL.Palette(K).R) - SrcPixels(I + 2) GDiff = CLng(BMIFPAL.Palette(K).G) - SrcPixels(I + 1) BDiff = CLng(BMIFPAL.Palette(K).B) - SrcPixels(I + 0) If RDiff * Vec1R(L) + GDiff * Vec1G(L) + BDiff * Vec1B(L) < 0 And _ RDiff * Vec2R(L) + GDiff * Vec2G(L) + BDiff * Vec2B(L) < 0 And _ RDiff * Vec3R(L) + GDiff * Vec3G(L) + BDiff * Vec3B(L) < 0 Then NewDistSq = RDiff * RDiff + GDiff * GDiff + BDiff * BDiff If NewDistSq < DistanceSq And NewDistSq <= MaxDistSq Then Vec4R(L) = RDiff Vec4G(L) = GDiff Vec4B(L) = BDiff Values4(L) = K DestPixels(L) = K DistanceSq = NewDistSq End If End If Next I = I + 3 L = L + 1 Next NTm = Timer If NTm - Tm >= RefreshInterval Then Tm = NTm SetDIBits picColor4.hDC, picColor4.Image.Handle, 0, PH, DestPixels(0), BMIFPAL, DIB_RGB_COLORS DrawProgress Y / (PH - 1) picColor4.Refresh DoEvents If QuitLoop Then Exit For End If LStart1 = LStart1 + Pitch1 LStart2 = LStart2 + Pitch2 Next SetDIBits picColor4.hDC, picColor4.Image.Handle, 0, PH, DestPixels(0), BMIFPAL, DIB_RGB_COLORS DrawProgress 1 picColor4.Refresh '============================================================================== '步骤5：将上面四步取得的颜色进行抖动混合 '------------------------------------------------------------------------------ LStart1 = 0 LStart2 = 0 picResult.Visible = True Dim DitherValue As Long For Y = 0 To PH - 1 I = LStart1 L = LStart2 For X = 0 To PW - 1 DitherValue = LM((X And &HF) + (Y And &HF) * &H10) If Values1(L) = Values2(L) And Values2(L) = Values3(L) And Values3(L) = Values4(L) Then '只有一个颜色 DestPixels(L) = Values1(L) ElseIf Values1(L) <> Values2(L) And Values2(L) = Values3(L) And Values3(L) = Values4(L) Then '抖动颜色1、2 ' Src ' /|~"-,_ ' / | ~"-,_ ' / | ~"-,_ ' / | ~"-,_ ' / | ~"-,_ 'Values1~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~Values2 Dim Vec1To2R As Long, Vec1To2G As Long, Vec1To2B As Long Dim Vec1To2Dist As Double, ProjLen As Double Vec1To2R = Vec2R(L) - Vec1R(L) Vec1To2G = Vec2G(L) - Vec1G(L) Vec1To2B = Vec2B(L) - Vec1B(L) Vec1To2Dist = Sqr(CDbl(Vec1To2R) * Vec1To2R + CDbl(Vec1To2G) * Vec1To2G + CDbl(Vec1To2B) * Vec1To2B) ProjLen = (-Vec1R(L) * Vec1To2R - Vec1G(L) * Vec1To2G - Vec1B(L) * Vec1To2B) / Vec1To2Dist If ProjLen * 255 / Vec1To2Dist <= DitherValue Then DestPixels(L) = Values1(L) Else DestPixels(L) = Values2(L) ElseIf Values1(L) <> Values2(L) And Values2(L) <> Values3(L) And Values3(L) = Values4(L) Then '抖动颜色1、2、3 'P2, '|\ ~"-,_ '| \ ~"-,_ '| P,__ ~"-,_ '| / ~~""--,,__ ~"-,_ '|L ~~""--===,_ 'P1~~~~~~~~~~~~~~~~~~~~~~~~~~~P3 Dim Plane123A As Double, Plane123B As Double, Plane123C As Double, Plane123D As Double Dim Plane123ABCLen As Double Dim Vec2To3R As Long, Vec2To3G As Long, Vec2To3B As Long Vec1To2R = Vec2R(L) - Vec1R(L) Vec1To2G = Vec2G(L) - Vec1G(L) Vec1To2B = Vec2B(L) - Vec1B(L) Vec2To3R = Vec3R(L) - Vec2R(L) Vec2To3G = Vec3G(L) - Vec2G(L) Vec2To3B = Vec3B(L) - Vec2B(L) Plane123A = Vec1To2G * Vec2To3B - Vec1To2B * Vec2To3G Plane123B = Vec1To2B * Vec2To3R - Vec1To2R * Vec2To3B Plane123C = Vec1To2R * Vec2To3G - Vec1To2G * Vec2To3R Plane123D = -(Plane123A * BMIFPAL.Palette(Values1(L)).R + Plane123B * BMIFPAL.Palette(Values1(L)).G + Plane123C * BMIFPAL.Palette(Values1(L)).B) Plane123ABCLen = Sqr(Plane123A * Plane123A + Plane123B * Plane123B + Plane123C * Plane123C) Plane123A = Plane123A / Plane123ABCLen Plane123B = Plane123B / Plane123ABCLen Plane123C = Plane123C / Plane123ABCLen Plane123D = Plane123D / Plane123ABCLen Dim PlaneFace23A As Double, PlaneFace23B As Double, PlaneFace23C As Double, PlaneFace23D As Double Dim PlaneFace23ABCLen As Double PlaneFace23A = Vec1G(L) * Plane123C - Vec1B(L) * Plane123B PlaneFace23B = Vec1B(L) * Plane123A - Vec1R(L) * Plane123C PlaneFace23C = Vec1R(L) * Plane123B - Vec1G(L) * Plane123A PlaneFace23D = -(PlaneFace23A * SrcPixels(I + 2) + PlaneFace23B * SrcPixels(I + 1) + PlaneFace23C * SrcPixels(I + 0)) PlaneFace23ABCLen = Sqr(PlaneFace23A * PlaneFace23A + PlaneFace23B * PlaneFace23B + PlaneFace23C * PlaneFace23C) PlaneFace23A = PlaneFace23A / PlaneFace23ABCLen PlaneFace23B = PlaneFace23B / PlaneFace23ABCLen PlaneFace23C = PlaneFace23C / PlaneFace23ABCLen PlaneFace23D = PlaneFace23D / PlaneFace23ABCLen Dim P2ToPlaneDist As Double, P3ToPlaneDist As Double, PlaneCutPosition As Double P2ToPlaneDist = Abs(BMIFPAL.Palette(Values2(L)).R * PlaneFace23A + BMIFPAL.Palette(Values2(L)).G * PlaneFace23B + BMIFPAL.Palette(Values2(L)).B * PlaneFace23C + PlaneFace23D) P3ToPlaneDist = Abs(BMIFPAL.Palette(Values3(L)).R * PlaneFace23A + BMIFPAL.Palette(Values3(L)).G * PlaneFace23B + BMIFPAL.Palette(Values3(L)).B * PlaneFace23C + PlaneFace23D) PlaneCutPosition = P2ToPlaneDist / (P2ToPlaneDist + P3ToPlaneDist) If PlaneCutPosition * 255 <= DitherValue Then DestPixels(L) = Values2(L) Else DestPixels(L) = Values3(L) Dim PointOnPlaneAnd2To3VecR As Double, PointOnPlaneAnd2To3VecG As Double, PointOnPlaneAnd2To3VecB As Double PointOnPlaneAnd2To3VecR = CDbl(BMIFPAL.Palette(Values2(L)).R) + Vec2To3R * PlaneCutPosition - SrcPixels(I + 2) PointOnPlaneAnd2To3VecG = CDbl(BMIFPAL.Palette(Values2(L)).G) + Vec2To3G * PlaneCutPosition - SrcPixels(I + 1) PointOnPlaneAnd2To3VecB = CDbl(BMIFPAL.Palette(Values2(L)).B) + Vec2To3B * PlaneCutPosition - SrcPixels(I + 0) Dim VecToThatPointR As Double, VecToThatPointG As Double, VecToThatPointB As Double, VecToThatPointLen As Double VecToThatPointR = PointOnPlaneAnd2To3VecR - Vec1R(L) VecToThatPointG = PointOnPlaneAnd2To3VecG - Vec1G(L) VecToThatPointB = PointOnPlaneAnd2To3VecB - Vec1B(L) VecToThatPointLen = Sqr(VecToThatPointR * VecToThatPointR + VecToThatPointG * VecToThatPointG + VecToThatPointB * VecToThatPointB) VecToThatPointR = VecToThatPointR / VecToThatPointLen VecToThatPointG = VecToThatPointG / VecToThatPointLen VecToThatPointB = VecToThatPointB / VecToThatPointLen ProjLen = (-Vec1R(L) * VecToThatPointR - Vec1G(L) * VecToThatPointG - Vec1B(L) * VecToThatPointB) / VecToThatPointLen If ProjLen * 255 <= DitherValue Then DestPixels(L) = Values1(L) Else '抖动颜色1、2、3、4 Dim Plane12PA As Double, Plane12PB As Double, Plane12PC As Double, Plane12PD As Double, Plane12PABCLen As Double Dim Plane34PA As Double, Plane34PB As Double, Plane34PC As Double, Plane34PD As Double, Plane34PABCLen As Double Plane12PA = Vec1G(L) * Vec2B(L) - Vec1B(L) * Vec2G(L) Plane12PB = Vec1B(L) * Vec2R(L) - Vec1R(L) * Vec2B(L) Plane12PC = Vec1R(L) * Vec2G(L) - Vec1G(L) * Vec2R(L) Plane34PA = Vec3G(L) * Vec4B(L) - Vec3B(L) * Vec4G(L) Plane34PB = Vec3B(L) * Vec4R(L) - Vec3R(L) * Vec4B(L) Plane34PC = Vec3R(L) * Vec4G(L) - Vec3G(L) * Vec4R(L) Plane12PD = -(Plane12PA * SrcPixels(I + 2) + Plane12PB * SrcPixels(I + 1) + Plane12PC * SrcPixels(I + 0)) Plane34PD = -(Plane34PA * SrcPixels(I + 2) + Plane34PB * SrcPixels(I + 1) + Plane34PC * SrcPixels(I + 0)) Plane12PABCLen = Sqr(Plane12PA * Plane12PA + Plane12PB * Plane12PB + Plane12PC * Plane12PC) Plane34PABCLen = Sqr(Plane34PA * Plane34PA + Plane34PB * Plane34PB + Plane34PC * Plane34PC) Plane12PA = Plane12PA / Plane12PABCLen Plane12PB = Plane12PB / Plane12PABCLen Plane12PC = Plane12PC / Plane12PABCLen Plane12PD = Plane12PD / Plane12PABCLen Plane34PA = Plane34PA / Plane34PABCLen Plane34PB = Plane34PB / Plane34PABCLen Plane34PC = Plane34PC / Plane34PABCLen Plane34PD = Plane34PD / Plane34PABCLen Dim Distance1ToP34 As Double, Distance2ToP34 As Double Dim Distance3ToP12 As Double, Distance4ToP12 As Double Distance1ToP34 = Abs(Vec1R(L) * Plane34PA + Vec1G(L) * Plane34PB + Vec1B(L) * Plane34PC + Plane34PD) Distance2ToP34 = Abs(Vec2R(L) * Plane34PA + Vec2G(L) * Plane34PB + Vec2B(L) * Plane34PC + Plane34PD) Distance3ToP12 = Abs(Vec3R(L) * Plane12PA + Vec3G(L) * Plane12PB + Vec3B(L) * Plane12PC + Plane12PD) Distance4ToP12 = Abs(Vec4R(L) * Plane12PA + Vec4G(L) * Plane12PB + Vec4B(L) * Plane12PC + Plane12PD) Dim P12Cut34 As Double, P34Cut12 As Double P12Cut34 = Distance3ToP12 + (Distance3ToP12 + Distance4ToP12) P34Cut12 = Distance1ToP34 + (Distance1ToP34 + Distance2ToP34) Dim Value12 As Byte, Value34 As Byte If P12Cut34 * 255 <= DitherValue Then Value34 = Values3(L) Else Value34 = Values4(L) If P34Cut12 * 255 <= DitherValue Then Value12 = Values1(L) Else Value12 = Values2(L) Vec1To2R = Vec2R(L) - Vec1R(L) Vec1To2G = Vec2G(L) - Vec1G(L) Vec1To2B = Vec2B(L) - Vec1B(L) Dim Vec3To4R As Long, Vec3To4G As Long, Vec3To4B As Long Vec3To4R = Vec4R(L) - Vec3R(L) Vec3To4G = Vec4G(L) - Vec3G(L) Vec3To4B = Vec4B(L) - Vec3B(L) Dim CutPoint1R As Double, CutPoint1G As Double, CutPoint1B As Double Dim CutPoint2R As Double, CutPoint2G As Double, CutPoint2B As Double CutPoint1R = Vec1R(L) + Vec1To2R * P34Cut12 CutPoint1G = Vec1G(L) + Vec1To2G * P34Cut12 CutPoint1B = Vec1B(L) + Vec1To2B * P34Cut12 CutPoint2R = Vec3R(L) + Vec3To4R * P12Cut34 CutPoint2G = Vec3G(L) + Vec3To4G * P12Cut34 CutPoint2B = Vec3B(L) + Vec3To4B * P12Cut34 Dim Dist12 As Double, Dist34 As Double Dist12 = Sqr(CutPoint1R * CutPoint1R + CutPoint1G * CutPoint1G + CutPoint1B * CutPoint1B) Dist34 = Sqr(CutPoint2R * CutPoint2R + CutPoint2G * CutPoint2G + CutPoint2B * CutPoint2B) If Dist12 * 255 / (Dist12 + Dist34) <= DitherValue Then DestPixels(L) = Value12 Else DestPixels(L) = Value34 End If I = I + 3 L = L + 1 Next NTm = Timer If NTm - Tm >= RefreshInterval Then Tm = NTm SetDIBits picResult.hDC, picResult.Image.Handle, 0, PH, DestPixels(0), BMIFPAL, DIB_RGB_COLORS DrawProgress Y / (PH - 1) picResult.Refresh DoEvents If QuitLoop Then Exit For End If LStart1 = LStart1 + Pitch1 LStart2 = LStart2 + Pitch2 Next SetDIBits picResult.hDC, picResult.Image.Handle, 0, PH, DestPixels(0), BMIFPAL, DIB_RGB_COLORS DrawProgress 1 picResult.Refresh cmdDither.Enabled = False OpSrcPic.Enabled = True OpDitherPic.Enabled = True OpDitherPic.Value = True End Sub Private Sub Form_Load() With BMIF24 .biSize = 40 .biPlanes = 1 .biBitCount = 24 End With With BMIFPAL .biSize = 40 .biPlanes = 1 .biBitCount = COLORS_BITS .biClrUsed = COLORS_MAX .biClrImportant = COLORS_MAX End With LM = LoadResData(101, "LIGHTMATRIX") Randomize Timer ProgWidth = picProgress.ScaleWidth End Sub Function Lerp(ByVal V1 As Long, ByVal V2 As Long, ByVal Val_0_255 As Long) As Long Lerp = V1 + (V2 - V1) * Val_0_255 \ 255 End Function Private Sub Form_OLEDragDrop(Data As DataObject, Effect As Long, Button As Integer, Shift As Integer, X As Single, Y As Single) On Local Error GoTo eHandlr Picture = LoadPicture(Data.Files(1)) PW = ScaleX(Picture.Width, vbHimetric, vbPixels) PH = ScaleY(Picture.Height, vbHimetric, vbPixels) picSrcPic.Move 0, 0, PW, PH picSrcPic.PaintPicture Picture, 0, 0 picColor1.Cls picColor2.Cls picColor3.Cls picColor4.Cls picResult.Cls picColor1.Visible = False picColor2.Visible = False picColor3.Visible = False picColor4.Visible = False picResult.Visible = False picColor1.Move PW * 0, 0, PW, PH picColor2.Move PW * 1, 0, PW, PH picColor3.Move PW * 2, 0, PW, PH picColor4.Move PW * 3, 0, PW, PH picResult.Move PW * 4, 0, PW, PH picDither_Resize HSDither_Change BMIF24.biWidth = PW BMIF24.biHeight = PH BMIFPAL.biWidth = PW BMIFPAL.biHeight = PH DrawProgress 0 If ChRandomPalette.Value Then Dim I& For I = 0 To UBound(BMIFPAL.Palette) BMIFPAL.Palette(I).R = Rnd * 255 BMIFPAL.Palette(I).G = Rnd * 255 BMIFPAL.Palette(I).B = Rnd * 255 Next Else If CreateOctreePaletteFromHBITMAP(hDC, Picture.Handle, PW, PH, COLORS_MAX, COLORS_BITS, BMIFPAL.Palette(0)) = 0 Then MsgBox "生成调色板失败。", vbExclamation End If End If DrawPal cmdDither.Enabled = True OpSrcPic.Enabled = False OpDitherPic.Enabled = False OpSrcPic.Value = True Exit Sub eHandlr: MsgBox Err.Description, vbExclamation, "出错" End Sub Sub DrawPal() Dim X&, Y& Dim DrX&, DrY& Dim I& For Y = 0 To 15 DrX = 0 For X = 0 To 15 picPal.Line (DrX, DrY)-(DrX + 4, DrY + 4), RGB(BMIFPAL.Palette(I).R, BMIFPAL.Palette(I).G, BMIFPAL.Palette(I).B), BF I = I + 1 If I >= COLORS_MAX Then Exit Sub DrX = DrX + 5 Next DrY = DrY + 5 Next End Sub Private Sub Form_Resize() On Error Resume Next picDither.Width = picRightPanel.Left End Sub Private Sub Form_Unload(Cancel As Integer) QuitLoop = True End End Sub Private Sub HSDither_Change() On Error Resume Next Dim LeftBegin As Long LeftBegin = -HSDither.Value picColor1.Left = LeftBegin + PW * 0 picColor2.Left = LeftBegin + PW * 1 picColor3.Left = LeftBegin + PW * 2 picColor4.Left = LeftBegin + PW * 3 picResult.Left = LeftBegin + PW * 4 End Sub Private Sub HSDither_Scroll() HSDither_Change End Sub Private Sub OpDitherPic_Click() picSrcPic.Visible = False picDither.Visible = True End Sub Private Sub OpSrcPic_Click() picSrcPic.Visible = True picDither.Visible = False End Sub Private Sub picDither_Resize() On Error Resume Next Dim PP1W As Long, PP1H As Long, HSMax As Long PP1W = picDither.ScaleWidth PP1H = picDither.ScaleHeight HSDither.Move 0, PP1H - 17, PP1W, 17 HSMax = PW * 5 - PP1W If HSMax > 0 Then HSDither.Max = HSMax HSDither.LargeChange = PP1W HSDither.Visible = True Else HSDither.Value = 0 HSDither.Visible = False End If End Sub 复制代码
取得调色板.exe
(64 KB, 下载次数: 19, 售价: 1 个宅币)
取得调色板.7z
(33.14 KB, 下载次数: 10, 售价: 10 个宅币)
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发表于 2014-6-20 20:42:57
发表于 2014-6-21 02:20:25
