Hi all,

I have written the following IronPython code:

import clr
clr.AddReference("System.Drawing")
from System import *
from System.Drawing import *
from System.Drawing.Imaging import *

originalImage = Bitmap("Test.bmp")

def RedTint(bitmap):
    bmData = bitmap.LockBits(Rectangle(0, 0, bitmap.Width, bitmap.Height), 
        ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb)

    ptr =  bmData.Scan0
    bytes = bmData.Stride * bitmap.Height
    rgbValues = Array.CreateInstance(Byte, bytes)

    Runtime.InteropServices.Marshal.Copy(ptr, rgbValues, 0, bytes)
    for i in rgbValues[::3]:
        i = 255

    Runtime.InteropServices.Marshal.Copy(rgbValues, 0, ptr, bytes)
    bitmap.UnlockBits(bmData)
    return bitmap

newPic = RedTint(originalImage)
newPic.Save("New.bmp")

Which is my interpretation of this MSDN code sample: http://msdn.microsoft.com/en-us/library/5ey6h79d.aspx except that I am saving the altered bitmap instead of displaying it in a Form.

The code runs, however the newly saved bitmap is an exact copy of the original image with no sign of any changes having occurred (it's supposed to create a red tint). Could anyone advise what's wrong with my code?

The image I'm using is simply a 24bpp bitmap I created in Paint (it's just a big white rectangle!), using IronPython 2.6 and on Windows 7 (x64) with .Net Framework 3.5 SP1 installed.