How do I recolor an image? (see images)

Question

How do I achieve this kind of color replacement programmatically?

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Answer 1

This code project article covers this and more: http://www.codeproject.com/KB/GDI-plus/Image_Processing_Lab.aspx

It uses the AForge.NET library to do a Hue filter on an image for a similar effect:

  // create filter

  AForge.Imaging.Filters.HSLFiltering filter =
      new AForge.Imaging.Filters.HSLFiltering( );
  filter.Hue = new IntRange( 340, 20 );
  filter.UpdateHue = false;
  filter.UpdateLuminance = false;
  // apply the filter

  System.Drawing.Bitmap newImage = filter.Apply( image );