Hi All,
I am trying to implement an image rectification option into ImgRegPlugin.

Input: aerial photo as *,jpg with RGB data (24 bit) and Image WorldFile.

I use Image.GetRow(...) to retreive pixel data row by row from the aerial photo to asign pixel by pixel to new rectified image as RecImage.Value(i,j) = ...

Problem: 24 bit RGB data requires at least 3 byte while Image.GetRow and Image.Value work on 2 byte integer pixel data.
Is this a possible bug in MapWinGIS.Image?

Below a simplified code sample of how I think it should work:

        Dim RecImage, OldImage As New MapWinGIS.Image
        Dim success As Boolean = True
        Dim Row As Integer
        Dim Pixels() As Integer
        Dim i, j As Integer


        ' more code here (not shown)


        ' Open old image
        OldImage.Open(ImgFileName)

        ' Create new Image Layer for rectified image

        success = RecImage.CreateNew(OldImage.Width, OldImage.Height)
        If Not success Then
            MsgBox("Could not create rectified Image Layer")
        Else
            Row = 0

            ReDim Pixels(OldImage.Width)

        ' Just copy image at this stage, rectification code to come later. (as shown in Wiki)
            For i = 0 To OldImage.Height - 1
                OldImage.GetRow(Row, Pixels(0))
                For j = 0 To OldImage.Width - 1
                    RecImage.Value(i, j) = Pixels(j)
                Next
                Row = Row + 1
            Next
            g_Map.Layers.Add(RecImage)
        End If

But g_Map.Layers.Add(RecImage) shows an image of roughly 1/5 the expected size, strangely with apperently correct pixel colors.

Any idea what is wrong or if we have a bug?

Cheers, Gerd

I've been struggling today with an analogous problem and I think I've found a solution:

try to set RecImage.dX = OldImage.dX and same for dY before copying the data.