Save JPG in progressive format

Question

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Public Sub Save(ByVal b As Bitmap, ByVal FileName As String, ByVal Compression As Long, ByVal MimeType As String)
    Dim Params As EncoderPara         


        

Answer 1

I suppose to use jpegtran utility as described in Image Optimization, Part 4: Progressive JPEG…Hot or Not? article:

jpegtran -copy none -progressive input.jpg output.jpg

In addition you can optimize Haffman tables by such way:

jpegtran -copy none -optimize input.jpg output.jpg