Private Function IsAnnotationInsideImage(annotation As Vintasoft.Imaging.Annotation.AnnotationData, image As Vintasoft.Imaging.VintasoftImage) As Boolean
    ' get the bounding box
    Dim boundingBox As System.Drawing.RectangleF = annotation.GetBoundingBox()
    ' calculate image size in device independent pixels
    Dim imageWidthInDips As Single = image.Width * 96F / CSng(image.Resolution.Horizontal)
    Dim imageHeightInDips As Single = image.Height * 96F / CSng(image.Resolution.Vertical)
    Dim imageRect As New System.Drawing.RectangleF(0, 0, imageWidthInDips, imageHeightInDips)
    ' check if image rectangle contains the bounding box
    Return imageRect.Contains(boundingBox)
End Function

bool IsAnnotationInsideImage(
    Vintasoft.Imaging.Annotation.AnnotationData annotation, 
    Vintasoft.Imaging.VintasoftImage image)
{
    // get the bounding box
    System.Drawing.RectangleF boundingBox = annotation.GetBoundingBox();
    // calculate image size in device independent pixels
    float imageWidthInDips = image.Width * 96f / (float)image.Resolution.Horizontal;
    float imageHeightInDips = image.Height * 96f / (float)image.Resolution.Vertical;
    System.Drawing.RectangleF imageRect = 
        new System.Drawing.RectangleF(0, 0, imageWidthInDips, imageHeightInDips);
    // check if image rectangle contains the bounding box
    return imageRect.Contains(boundingBox);
}