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Option Explicit
Public Enum enmFilter
conFltBlacknWhite = 0
conFltBlur = 1
conFltBrightness = 2
conFltCrease = 3
conFltDarkness = 4
conFltDiffuse = 5
conFltEmboss = 6
conFltGrayBlacknWhite = 7
conFltGrayscale = 8
conFltInvertColors = 9
conFltReplaceColors = 10
conFltSharpen = 11
conFltSnow = 12
conFltWave = 13
End Enum
'Properties for "replace color" filter
Public lngReplacedColor As Long
Public lngReplaceWithColor As Long
Public Sub ApplyFilter(intFilter As enmFilter, ByRef pic As PictureBox, _
Optional X1 As Long = -1, Optional Y1 As Long = -1, _
Optional X2 As Long = -1, Optional Y2 As Long = -1)
Dim blnSmallArea As Boolean 'Condition whether the filter operation
' only be applied to small area
Dim intDrawMode As Integer 'to keep current draw mode value
Dim lngColor() As Long 'three dimensions array to save RGB color (first
' dimension: R = 0, G = 1, B = 2) of
' (X,Y) coordinate (second and third dimensions)
Dim lngReadColor As Long 'current color readed
Dim lngTransColor As Long 'color transformation factor
Dim lngWriteColor As Long 'current color written
Dim R As Long 'current RGB
Dim G As Long ' color
Dim B As Long 'information
Dim sngFilterFactor As Single
Dim X As Long 'current coordinate
Dim Y As Long ' pixel processed
If (X1 = -1) And (Y1 = -1) And (X2 = -1) And (Y2 = -1) Then
X1 = 0
Y1 = 0
X2 = pic.ScaleWidth
Y2 = pic.ScaleHeight
End If
blnSmallArea = (((X2 - X1) * (Y2 - Y1)) < (16 * 16))
With pic
intDrawMode = .DrawMode
.DrawMode = vbCopyPen
Select Case intFilter
Case conFltBlacknWhite
sngFilterFactor = 192 'increase this value to get more black colors
' than white colors or decrease it to get
' more white colors than black colors
' 0 for total white and 256 for total black)
For X = X1 To X2
For Y = Y1 To Y2
lngReadColor = mdlAPI.GetPixel(hDC:=.hDC, X:=X, Y:=Y)
R = lngReadColor Mod 256
If (R >= sngFilterFactor) Then
lngWriteColor = vbWhite
Else
G = (lngReadColor \ 256) Mod 256
If (G >= sngFilterFactor) Then
lngWriteColor = vbWhite
Else
B = (lngReadColor \ 256) \ 256
If (B >= sngFilterFactor) Then
lngWriteColor = vbWhite
Else
lngWriteColor = vbBlack
End If
End If
End If
mdlAPI.SetPixel hDC:=.hDC, X:=X, Y:=Y, crColor:=lngWriteColor
Next
If Not blnSmallArea Then
pic.Refresh
End If
Next
Case conFltBlur
sngFilterFactor = 10 'decrease this value to get more bright blur
' or increase it to get more dark blur
' (limit to 0 for total white and
' 256 for total black
RetrieveColorInformation pic:=pic, lngColor:=lngColor, _
X1:=X1, Y1:=Y1, X2:=X2, Y2:=Y2, _
blnShowProgress:=(Not blnSmallArea)
For X = X1 + 1 To X2 - 1
For Y = Y1 + 1 To Y2 - 1
R = lngColor(0, X - 1, Y - 1) + lngColor(0, X, Y - 1) + _
lngColor(0, X + 1, Y - 1) + lngColor(0, X - 1, Y) + _
lngColor(0, X, Y) + lngColor(0, X + 1, Y) + _
lngColor(0, X - 1, Y + 1) + lngColor(0, X, Y + 1) + _
lngColor(0, X + 1, Y + 1)
G = lngColor(1, X - 1, Y - 1) + lngColor(1, X, Y - 1) + _
lngColor(1, X + 1, Y - 1) + lngColor(1, X - 1, Y) + _
lngColor(1, X, Y) + lngColor(1, X + 1, Y) + _
lngColor(1, X - 1, Y + 1) + lngColor(1, X, Y + 1) + _
lngColor(1, X + 1, Y + 1)
B = lngColor(2, X - 1, Y - 1) + lngColor(2, X, Y - 1) + _
lngColor(2, X + 1, Y - 1) + lngColor(2, X - 1, Y) + _
lngColor(2, X, Y) + lngColor(2, X + 1, Y) + _
lngColor(2, X - 1, Y + 1) + lngColor(2, X, Y + 1) + _
lngColor(2, X + 1, Y + 1)
lngWriteColor = RGB(Abs(R / sngFilterFactor), _
Abs(G / sngFilterFactor), _
Abs(B / sngFilterFactor))
mdlAPI.SetPixel hDC:=.hDC, X:=X, Y:=Y, crColor:=lngWriteColor
Next
If Not blnSmallArea Then
pic.Refresh
End If
Next
Case conFltBrightness, conFltDarkness
Select Case intFilter
Case conFltBrightness
If Not blnSmallArea Then
sngFilterFactor = 32 'decrease this value to make more bright or
' increase it to make less bright
' (limit to 0 for total white and
' 256 for no brightness)
Else
sngFilterFactor = 2
End If
Case conFltDarkness
If Not blnSmallArea Then
sngFilterFactor = -32 'decrease this value to make more dark or
' increase it to make less dark
' (-256 for inverting colors and
' limit to for no darkness)
Else
sngFilterFactor = -2
End If
End Select
For X = X1 To X2
For Y = Y1 To Y2
lngReadColor = mdlAPI.GetPixel(hDC:=.hDC, X:=X, Y:=Y)
GetRGBColor lngColor:=lngReadColor, R:=R, G:=G, B:=B
lngWriteColor = RGB(Abs(R + sngFilterFactor), _
Abs(G + sngFilterFactor), _
Abs(B + sngFilterFactor))
mdlAPI.SetPixel hDC:=.hDC, X:=X, Y:=Y, crColor:=lngWriteColor
Next
If Not blnSmallArea Then
pic.Refresh
End If
Next
Case conFltCrease, conFltWave
Select Case intFilter
Case conFltCrease
sngFilterFactor = 512 'decrease this value to get more crease or
' increase it to get less crease
' (64 for maximum crease and
' 65536 for no crease)
Case conFltWave
sngFilterFactor = 4 'increase this value to get more wave or
' decrease it to get less wave
' (0 for no wave and 16 for maximum wave)
End Select
RetrieveColorInformation pic:=pic, lngColor:=lngColor, _
X1:=X1, Y1:=Y1, X2:=X2, Y2:=Y2, blnAll:=True, _
blnShowProgress:=(Not blnSmallArea)
For X = X1 To X2
For Y = Y1 To Y2
lngWriteColor = lngColor(3, X, Y)
mdlAPI.SetPixel hDC:=.hDC, X:=X, _
Y:=(Sin(X) * sngFilterFactor) + (Y), _
crColor:=lngWriteColor
Next
If Not blnSmallArea Then
pic.Refresh
End If
Next
Case conFltDiffuse
sngFilterFactor = 5
RetrieveColorInformation pic:=pic, lngColor:=lngColor, _
X1:=X1, Y1:=Y1, X2:=X2, Y2:=Y2, blnAll:=True, _
blnShowProgress:=(Not blnSmallArea)
For X = X1 + 2 To X2 - 3
For Y = Y1 + 2 To Y2 - 3
lngReadColor = lngColor(3, X, Y + Int((Rnd * sngFilterFactor) - 2))
R = Abs(lngReadColor Mod 256)
lngReadColor = lngColor(3, X + Int((Rnd * sngFilterFactor) - 2), Y)
G = Abs((lngReadColor \ 256) Mod 256)
lngReadColor = lngColor(3, X + Int((Rnd * sngFilterFactor) - 2), _
Y + Int((Rnd * sngFilterFactor) - 2))
B = Abs((lngReadColor \ 256) \ 256)
lngWriteColor = RGB(Red:=R, Green:=G, Blue:=B)
mdlAPI.SetPixel hDC:=.hDC, X:=X, Y:=Y, crColor:=lngWriteColor
Next
If Not blnSmallArea Then
pic.Refresh
End If
Next
Case conFltEmboss
sngFilterFactor = -128 'increase this abs(value) to get more bright
' emboss decrease it to get more dark emboss
' (0 for maximum dark emboss and
' 256 for maximum bright emboss
RetrieveColorInformation pic:=pic, lngColor:=lngColor, _
X1:=X1, Y1:=Y1, X2:=X2, Y2:=Y2, _
blnShowProgress:=(Not blnSmallArea)
For X = X1 To X2 - 1
For Y = Y1 To Y2 - 1
R = Abs(lngColor(0, X, Y) - lngColor(0, X + 1, Y + 1) + _
sngFilterFactor)
G = Abs(lngColor(1, X, Y) - lngColor(1, X + 1, Y + 1) + _
sngFilterFactor)
B = Abs(lngColor(2, X, Y) - lngColor(2, X + 1, Y + 1) + _
sngFilterFactor)
lngWriteColor = RGB(Red:=R, Green:=G, Blue:=B)
mdlAPI.SetPixel hDC:=.hDC, X:=X, Y:=Y, crColor:=lngWriteColor
Next
If Not blnSmallArea Then
pic.Refresh
End If
Next
Case conFltGrayBlacknWhite
sngFilterFactor = 3 'increase this value to get more black colors
' or decrase it to get more white colors
' (limit to 0 for total white
' and 32 for total black)
For X = X1 To X2
For Y = Y1 To Y2
lngReadColor = mdlAPI.GetPixel(hDC:=.hDC, X:=X, Y:=Y)
GetRGBColor lngColor:=lngReadColor, R:=R, G:=G, B:=B
R = Abs(R * (G - B + G + R)) / 256
G = Abs(R * (B - G + B + R)) / 256
B = Abs(G * (B - G + B + R)) / 256
lngReadColor = RGB(Red:=R, Green:=G, Blue:=B)
GetRGBColor lngColor:=lngReadColor, R:=R, G:=G, B:=B
lngReadColor = (R + G + B) / sngFilterFactor
lngWriteColor = RGB(Red:=lngReadColor, _
Green:=lngReadColor, Blue:=lngReadColor)
mdlAPI.SetPixel hDC:=.hDC, X:=X, Y:=Y, crColor:=lngWriteColor
Next
If Not blnSmallArea Then
pic.Refresh
End If
Next
Case conFltGrayscale
sngFilterFactor = 0.32 'increase this value to get more bright grayscale
' or decrease it to get more dark grayscale
' (0 for total black and (256 / 6)
' for almost total white
For X = X1 To X2
For Y = Y1 To Y2
lngReadColor = mdlAPI.GetPixel(hDC:=.hDC, X:=X, Y:=Y)
GetRGBColor lngColor:=lngReadColor, R:=R, G:=G, B:=B
lngTransColor = Abs((R * sngFilterFactor) + _
(G * sngFilterFactor) + (B * sngFilterFactor))
lngWriteColor = RGB(Red:=lngTransColor, _
Green:=lngTransColor, Blue:=lngTransColor)
mdlAPI.SetPixel hDC:=.hDC, X:=X, Y:=Y, crColor:=lngWriteColor
Next
If Not blnSmallArea Then
pic.Refresh
End If
Next
Case conFltReplaceColors
For X = X1 To X2
For Y = Y1 To Y2
lngReadColor = mdlAPI.GetPixel(hDC:=.hDC, X:=X, Y:=Y)
If lngReadColor = lngReplacedColor Then
lngWriteColor = lngReplaceWithColor
mdlAPI.SetPixel hDC:=.hDC, X:=X, Y:=Y, crColor:=lngWriteColor
End If
Next
If Not blnSmallArea Then
pic.Refresh
End If
Next
Case conFltSharpen, conFltSnow
Select Case intFilter
Case conFltSharpen
sngFilterFactor = 0.5 'increase this value to get more sharp
' or decrease it to get less sharp
' (0 for no sharpen and
' 2 for maximum sharpen)
Case conFltSnow
sngFilterFactor = 24 'increase this value to get more snow
' or decrease it to get less snow
' (4 for minimum snowy and
' 64 for maximum snowy)
End Select
RetrieveColorInformation pic:=pic, lngColor:=lngColor, _
X1:=X1, Y1:=Y1, X2:=X2, Y2:=Y2, _
blnShowProgress:=(Not blnSmallArea)
For X = X1 + 1 To X2
For Y = Y1 + 1 To Y2
R = lngColor(0, X, Y) + _
(sngFilterFactor * _
(lngColor(0, X, Y) - lngColor(0, X - 1, Y - 1)))
G = lngColor(1, X, Y) + _
(sngFilterFactor * _
(lngColor(1, X, Y) - lngColor(1, X - 1, Y - 1)))
B = lngColor(2, X, Y) + _
(sngFilterFactor * _
(lngColor(2, X, Y) - lngColor(2, X - 1, Y - 1)))
lngWriteColor = RGB(Abs(R), Abs(G), Abs(B))
mdlAPI.SetPixel hDC:=.hDC, X:=X, Y:=Y, crColor:=lngWriteColor
Next
If Not blnSmallArea Then
pic.Refresh
End If
Next
End Select
.DrawMode = intDrawMode
.Refresh
End With
Exit Sub
End Sub
' Purpose : Get each R (red), G (green), B (blue) information color from RGB
' color lngColor
' Assumptions: -
' Effects : -
' Inputs : lngColor
' Return : R, G, B
Private Sub GetRGBColor(lngColor As Long, ByRef R As Long, _
ByRef G As Long, ByRef B As Long)
R = lngColor Mod 256
G = (lngColor \ 256) Mod 256
B = (lngColor \ 256) \ 256
Exit Sub
End Sub
' Purpose : Retrieve every pixels color information in region (X1,Y1)-(X2,Y2)
' of picture box pic and save the result to lngColor()
' Assumptions: -
' Effects : -
' Input : * pic
' * X1, Y1, X2, Y2
' * blnAll (condition whether to retrieve all color in once
' or seperate it in Red, Green and Blue color information
' * blnShowProgress (condition whether it needs to refresh for
' every column filtered)
' Return : lngColor() (three dimensions array to save RGB color (first
' dimension: R = 0, G = 1, B = 2, All = 3) of (X,Y)
' coordinate (second and third dimensions))
Private Sub RetrieveColorInformation( _
pic As PictureBox, ByRef lngColor() As Long, _
Optional X1 As Long = -1, Optional Y1 As Long = -1, _
Optional X2 As Long = -1, Optional Y2 As Long = -1, _
Optional blnAll As Boolean = False, _
Optional blnShowProgress = True _
)
Dim R As Long 'current RGB
Dim G As Long ' color
Dim B As Long 'information
Dim X As Long 'current coordinate
Dim Y As Long ' pixel processed
If (X1 = -1) Or (Y1 = -1) Or (X2 = -1) Or (Y2 = -1) Then
X1 = 0
Y1 = 0
X2 = pic.ScaleWidth
Y2 = pic.ScaleHeight
End If
If blnAll Then
ReDim lngColor(3, X2, Y2)
Else
ReDim lngColor(2, X2, Y2)
End If
For X = X1 To X2
For Y = Y1 To Y2
If blnAll Then
lngColor(3, X, Y) = mdlAPI.GetPixel(pic.hDC, X, Y)
Else
GetRGBColor lngColor:=mdlAPI.GetPixel(pic.hDC, X, Y), R:=R, G:=G, B:=B
lngColor(0, X, Y) = R
lngColor(1, X, Y) = G
lngColor(2, X, Y) = B
End If
Next
If blnShowProgress Then
End If
Next
Exit Sub
End Sub
