How to change the pixel dimension height?

I need to fix the pixel dimension height "768" for tiff images via scripting. Kindly advise me how to change the height for the images.

i am using vb.net i can't able to fix exact width and heigth for my below code
appref.Preferences.RulerUnits = Photoshop.PsUnits.psInches
docref = appref.Open(CheckerPath.Path & \" & InputFile_From_Illust)
TiffSv.ImageCompression = Photoshop.PsTiffEncodingType.psTiffLZW
docref.SaveAs(IllustFolder + "\" + IllustFile.Name, TiffSv)
docref.ChangeMode(DestinationMode:=Photoshop.PsChangeMode.psConvertToRGB)
TiffSv.EmbedColorProfile = False
Dim heg, wid As Double
heg = 768 / 300
wid = 576 / 300
docref.ResizeImage(wid, heg, Resolution:=300)
But its fixing width as 0.46 and height as 0.613 why its happen i don't.
please advise me.

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<?xml version="1.0" encoding="utf-8"?>
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