I am converting a tiff file into a png file:

oImage = newobject('GpBitmap', '_gdiplus.vcx')
oImage.CreateFromFile(this.pcapplicationpath + lcSku + '.tiff')
oImage.SaveToFile(this.pcapplicationpath + lcSku + '.png',"image/png",'quality=100')

My tiff file is a bit larger then the original source it was created from.
Can I scan down the resultant png?

Thanks