Converting RGB() to R G and B Values

[mystiq]

The tip doesn't work:
Public Function UnRGB(RGBCol As Long, Part As Integer) As Integer
'Part: 0=Red, 1=Green, 2=Blue

Select Case Part
Case 0
UnRGB = RGBCol And &HFF
' mask 000000000000000011111111 and shift bits right
Case 1
UnRGB = (RGBCol And &HFF00) / &HFF
' mask 000000001111111100000000 and shift bits right
Case 2
UnRGB = (RGBCol And &HFF0000) / &HFFFF
' mask 111111110000000000000000 and shift bits right
End Select

End Function


It overflows on G and B value, but R works right, i need a working one :-) It's supposed to convert an RGB value (such as the RGB function) into the specified part (R G or B).

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-Mystiq

[This message has been edited by mystiq (edited 11-27-1999).]

[This message has been edited by mystiq (edited 11-27-1999).]

[joey o.]

Please tell me what this is supposed to do before I try to answer. Is it supposed to return the value of a color selected,covert colors coded in other formats, or something different? I want to try to help.

[mystiq]

In other words: unRGB(RGB(255,128,64),1) should return 128, because 1 is green, and the green value is 128. But the function doesn't work, it'll overflow, only red works.

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-Mystiq

[Aaron Young]

Try this instead:

Public Function UnRGB(ByVal RGBCol As Long, ByVal Part As Integer) As Integer
UnRGB = Val("&H" & Mid$(Right$("000000" & Hex(RGBCol), 6), 5 - (2 * Part), 2))
End Function


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Aaron Young
Analyst Programmer
aarony@redwingsoftware.com
adyoung@win.bright.net

[mystiq]

Yay, that works, thanks :)

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-Mystiq