Output of Twain, brightness too hight

[wittaya]

Dear Loïc,

This is my sample code.

Sub Twain_Start()

Dim DefaultSourceName As String = "Plustek OpticSlim 550"
Dim nImageID As Integer = 0
AxGdViewer1.Clear()

AxImaging1.TwainOpenSource(DefaultSourceName)
If AxImaging1.TwainOpenDefaultSource Then

AxImaging1.TwainSetCurrentResolution(300)
AxImaging1.TwainSetCurrentPixelType(GdPicturePro5S.TwainPixelType.TWPT_RGB)
AxImaging1.TwainSetCurrentBitDepth(24)
AxImaging1.TwainSetPaperSize(GdPicturePro5S.TwainPaperSize.None)
AxImaging1.TwainSetHideUI(True)

nImageID = AxImaging1.CreateImageFromTwain(Me.Handle.ToInt32)
If nImageID <> 0 Then
AxImaging1.SetNativeImage(nImageID)
AxImaging1.AutoDeskew()
AxGdViewer1.SetNativeImage(AxImaging1.GetNativeImage)
AxImaging1.SaveAsJPEG("C:\1.jpg", 90)
End If
End If

AxImaging1.TwainCloseSource()

End Sub


When I see the output image file(C:\1.jpg) brightness of image is so white.
I use the same code on winxp sp3 no problem with it, problem is on windows7 enterprise.
Please help me check it.

Thank you

Best regards,
Wittaya

[wittaya]

Dear Loïc,

Sorry I forgot to tell about the version, I use version 5.12.0.1 (but version 5.13.8 is the same problem)

Thank you

Best regards,
Wittaya

[wittaya]

Dear Loïc,

I solved it already by set "Imaging1.TwainSetCurrentBrightness(0)" I don't know why default is 300 but anyway its works fine now.

Best regards,
Wittaya

[Loïc]

Hi Wittaya,

Thank you for the update. I encountered similar twain driver behavior with a canon scanner. On Win7 it increase the default brightness value. I really don't know why.

Kind regards,

Loïc

[wittaya]

Dear Loïc,

Can you do me a favor?
I would like you to check resize function (Imaging1.ResizeImage(width, height)) on windows7 with GRAY image type for me?
I was test it on winxp sp3 not found any problem, but on windows7 the output image seems weird.

This is my code....

AxImaging1.SaveAsJPEG("C:\1.jpg") ' original
AxImaging1.ResizeImage(1454, 1017)
AxImaging1.SaveAsJPEG("C:\2.jpg") ' output

I use version 5.12.0.4

Best regards,
Wittaya

[Loïc]

Hi,

Please first make a try with latest available version.

Kind regards,

Loïc

[wittaya]

Hello Loïc,

Yes, I tried to test with latest available version 5.13.8, the result is the same.

Regards,
Wittaya