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火猴 2005-03-09
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http://www.brucelindbloom.com/index.html?LabGamutDisplay.html
这里面全了
这里面全了
sagezk 2005-03-09
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多谢各位，结贴给分了!
sagezk 2005-03-05
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十分感谢楼上两位，我苦苦搜了n个月，技术资料查了个一箩筐，可关于Lab颜色系统的文章太少了，各位再接再厉，在此小弟多谢!
大可山人 2005-02-25
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RGB-HSB-CMYK-Lab转换算法:
Public Shared Function FromHSB ( ByVal Hue As Single, ByVal Saturation As Single, ByVal Brightness As Single) As Color
Hue /= 360
Dim r As Double = 0
Dim g As Double = 0
Dim b As Double = 0
Dim temp1, temp2 As Double
If Brightness = 0 Then
r = 0
g = 0
b = 0
Else
If Saturation = 0 Then
r = Brightness
g = Brightness
b = Brightness
Else
If Brightness <= 0.5 Then
temp2 = Brightness * (1.0 + Saturation)
Else
temp2 = Brightness + Saturation - Brightness * Saturation
End If
temp1 = 2.0 * Brightness - temp2
Dim t3() As Double = {Hue + 1.0 / 3.0, Hue , Hue - 1.0 / 3.0}
Dim clr () As Double = {0, 0, 0}
Dim i As Integer
For i = 0 To 2
If t3(i) < 0 Then t3(i) += 1.0
If t3(i) > 1 Then t3(i) -= 1.0
If 6.0 * t3(i) < 1.0 Then
clr(i) = temp1 + (temp2 - temp1) * t3(i) * 6.0
ElseIf 2.0 * t3(i) < 1.0 Then
clr(i) = temp2
ElseIf 3.0 * t3(i) < 2.0 Then
clr(i) = temp1 + (temp2 - temp1) * (2.0 / 3.0 - t3(i)) * 6.0
Else
clr(i) = temp1
End If
Next i
r = clr(0)
g = clr(1)
b = clr(2)
End If
End If
Return Color.FromArgb ( CInt (255 * r), CInt (255 * g), CInt (255 * b))
End Function
还有其他几种算法，有一个网站专门讲这个，查到之后再告诉你。
Public Shared Function FromHSB ( ByVal Hue As Single, ByVal Saturation As Single, ByVal Brightness As Single) As Color
Hue /= 360
Dim r As Double = 0
Dim g As Double = 0
Dim b As Double = 0
Dim temp1, temp2 As Double
If Brightness = 0 Then
r = 0
g = 0
b = 0
Else
If Saturation = 0 Then
r = Brightness
g = Brightness
b = Brightness
Else
If Brightness <= 0.5 Then
temp2 = Brightness * (1.0 + Saturation)
Else
temp2 = Brightness + Saturation - Brightness * Saturation
End If
temp1 = 2.0 * Brightness - temp2
Dim t3() As Double = {Hue + 1.0 / 3.0, Hue , Hue - 1.0 / 3.0}
Dim clr () As Double = {0, 0, 0}
Dim i As Integer
For i = 0 To 2
If t3(i) < 0 Then t3(i) += 1.0
If t3(i) > 1 Then t3(i) -= 1.0
If 6.0 * t3(i) < 1.0 Then
clr(i) = temp1 + (temp2 - temp1) * t3(i) * 6.0
ElseIf 2.0 * t3(i) < 1.0 Then
clr(i) = temp2
ElseIf 3.0 * t3(i) < 2.0 Then
clr(i) = temp1 + (temp2 - temp1) * (2.0 / 3.0 - t3(i)) * 6.0
Else
clr(i) = temp1
End If
Next i
r = clr(0)
g = clr(1)
b = clr(2)
End If
End If
Return Color.FromArgb ( CInt (255 * r), CInt (255 * g), CInt (255 * b))
End Function
还有其他几种算法，有一个网站专门讲这个，查到之后再告诉你。
寻开心 2005-02-25
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http://www.brucelindbloom.com/
math栏目
但是需要注意，那是分析色系之间标准的转换的
但是对 photoshop 未必使用， photshop是针对印刷行业的油墨特色做了一些调整的
它使用自己的公式
因此给了你rgb数值，转换出不一致的cmyk，lab等数值也是很正常的事情
math栏目
但是需要注意，那是分析色系之间标准的转换的
但是对 photoshop 未必使用， photshop是针对印刷行业的油墨特色做了一些调整的
它使用自己的公式
因此给了你rgb数值，转换出不一致的cmyk，lab等数值也是很正常的事情
sagezk 2005-01-25
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题目太难，没人会？还是太简单！各路高手进来讨论一下!
