Where Can I Use It?

The use of this component are not just limited to ASP applications. Since it is a COM component, you can use it for any application that is capable of creating COM server objects and calling methos on it. If your application involves uploading image files from clients, then you can determine the size of images at run time and depending on thoses you can accept or reject the uploaded file. Other use can be to create thumbnail image from a huge image and store that for displaying.

How do I use it?

The component is very easy to use. In your ASP page, you will create it as any other COM component and invoke the properties or methods on it.

Example1 - Determining Size Of Image

<%@Language=javascript%>
<%
	Response.Buffer = true;
	var obImgEngine = null;
	var obImage = null;
	try
	{
		// Create image charting engine.
		obImgEngine = Server.CreateObject("NETOMATIX.ImageEngine");
		var strImgFile = Server.MapPath("CD001.jpg");
		obImage = obImgEngine.GetImageSize(strImgFile);
		Response.Write("Width: " + obImage.Width);
		Response.Write("<br>");
		Response.Write("Height: " + obImage.Height);
	}
	catch  (ex)
	{
		Response.Write(ex.description);
	}
%>						
						

Example2 - Creating Thumbnail Image

<%@Language=javascript%>
<%
	Response.Buffer = true;
	var obImgEngine = null;
	var obImage = null;
	try
	{
		obImgEngine = Server.CreateObject("NETOMATIX.ImageEngine");
		var strImgFile = Server.MapPath("CD001.jpg");
		var strDestFile = Server.MapPath("uploadedfiles/CD001_th.jpg");
		obImgEngine.CreateThumbnail(strImgFile, strDestFile, 30, 30, 0, 1);
	}
	catch  (ex)
	{
		Response.Write(ex.description);
	}
%>						
						

Example3 - Merging two images

<%@Language=javascript%>
<%
	Response.Buffer = true;
	var obImgEngine = null;
	var obImage = null;
	try
	{
		obImgEngine = Server.CreateObject("NETOMATIX.ImageEngine");
		var x = 0;
		var y = 0;
		var strImgFile = Server.MapPath("CD001.jpg");
		var strLogoImage = Server.MapPath("logo.jpg");
		var strDestFile = Server.MapPath("uploadedfiles/CD001_masked.jpg");
		obImgEngine.MergeImages(strImgFile, strLogoImage, strDestFile, 3, 1, x, y);
	}
	catch  (ex)
	{
		Response.Write(ex.description);
	}
%>						
						

Example4 - Writing text on an image

<%@Language=javascript%>
<%
	Response.Buffer = true;
	var obImgEngine = null;
	var obImage = null;
	try
	{
		obImgEngine = Server.CreateObject("NETOMATIX.ImageEngine");
		var x = 0;
		var y = 0;
		var strImgFile = Server.MapPath("CD001.jpg");
		var strLogoText = "Pardesi Logo";
		var obFont = pImageEngine.GetFontObject();
		var obColor = pImageEngine.GetColorObject();
		
		obColor.R = 255;
		obColor.G = 0;
		obColor.B = 255;
		
		obFont.Name = "Arial";
		obFont.Size = 12;
		obFont.Bold = true;
		
		var strDestFile = Server.MapPath("uploadedfiles/CD001_text.jpg");
		obImgEngine.WriteTextOnImage(strImgFile, strDestFile, strLogoText, 1, x, y, obFont, obColor, 1);
	}
	catch  (ex)
	{
		Response.Write(ex.description);
	}
%>						
						

What methods to call?

• GetImageSize
  • bstrSourcercImageFile - Source image file path
  • ImageObject is returned. It supports two properties, Width and Height. Use these properties to get image size information.
• CreateThumbnail
  • SourceFile - Used to specify the path for source image
  • DestFile = Used to specify the path for thumnail image file.
  • Width - Used to specify width of thumbnail
  • Height - Used to specify height of thumbnail
  • ModificationBy - Used to specify method to be used to calculate the size of thumbnail image.
    • 0 - MODIFY_ABSOLUTE, The method will use the values specified in Width and Height parameters as size of the thumbnail.
    • 1 - MODIFY_PERCENTAGE, The method will calculate the thumnail dimensions as percentage of the source image size. If you choose this method, the values of Width and Height parameters should be between 0 and 100.
  • Format - Used to specify image format for destination thumbnail file. Currently the component supports the following formats.
    • 0 - bmp
    • 1 - jpeg
    • 2 - gif
    • 3 - png
    • 4 - tiff
• CreateThumbnailEx This is new method in version 2.7. It should only be used to resize GIF images with transparent pixels.
  • SourceFile - Used to specify the path for source image
  • DestFile = Used to specify the path for thumnail image file.
  • Width - Used to specify width of thumbnail
  • Height - Used to specify height of thumbnail
  • ModificationBy - Used to specify method to be used to calculate the size of thumbnail image.
    • 0 - MODIFY_ABSOLUTE, The method will use the values specified in Width and Height parameters as size of the thumbnail.
    • 1 - MODIFY_PERCENTAGE, The method will calculate the thumnail dimensions as percentage of the source image size. If you choose this method, the values of Width and Height parameters should be between 0 and 100.
  • Format - Used to specify image format for destination thumbnail file. Currently the component supports the following formats.
    • 0 - bmp
    • 1 - jpeg
    • 2 - gif
    • 3 - png
    • 4 - tiff
• WriteTextOnImage
  • SourceFile - Used to specify the path for source image
  • DestFile = Used to specify the path for thumnail image file.
  • Text - Text string that needs to be written on the image.
  • PosType - Used to specify position where text needs to be drawn on image. This variable can have one of the following value.
    • 0 - TopLeft, The text will be drawn on upper left corner of image.
    • 1 - TopRight, The text will drawn on upper right corner of image.
    • 2 - BottomLeft, The text will be drawn on lower left corner of image.
    • 3 - BottomRight, The text will be drawn on lower right corner of the image/
    • 4 - TopCenter, The text will be drawn on top center position of the image.
    • 5 - BottomCenter, The text will drawn on lower centre position of the image.
    • 6 - Center, The text will be drawn in the middle of the image.
    • 7 - Custom, The text will be drawn at the position specified by x and y parameters.
  • x - X-corodinate of the position where text should be drawn. This value if only used if PosType parameter value is set to Custom.
  • y - Y-corodinate of the position where text should be drawn. This value if only used if PosType parameter value is set to Custom.
  • FontObject - You can specify the font to be used for drawing text. This object can be obtained by calling GetFontObject method on ImageEngine object.
  • ColorObject - You can specify the color to be used for drawing text. This object can be obtained by calling GetColorObject method on ImageEngine object. You can specify R,G,B and A values for this object.
  • Format - Used to specify image format for destination file. Currently the component supports the following formats.
    • 0 - bmp
    • 1 - jpeg
    • 2 - gif
    • 3 - png
    • 4 - tiff
• MergeImages
  • BaseImageFile - Used to specify the path for source image
  • MaskImageFile - Used to specify the path for source image
  • DestFile = Used to specify the path for thumnail image file.
  • PosType - Used to specify position where mask image should be drawn on the base image. The parameter can have one of the following values.
    • 0 - TopLeft, The mask image will be drawn on upper left corner of image.
    • 1 - TopRight, The mask image will drawn on upper right corner of image.
    • 2 - BottomLeft, The mask image will be drawn on lower left corner of image.
    • 3 - BottomRight, The mask image will be drawn on lower right corner of the image/
    • 4 - TopCenter, The mask image will be drawn on top center position of the image.
    • 5 - BottomCenter, The mask image will drawn on lower centre position of the image.
    • 6 - Center, The mask image will be drawn in the middle of the image.
    • 7 - Custom, The mask image will be drawn at the position specified by x and y parameters.
  • Format - Used to specify image format for destination file. Currently the component supports the following formats.
    • 0 - bmp
    • 1 - jpeg
    • 2 - gif
    • 3 - png
    • 4 - tiff
  • x - X-corodinate of the position where mask image should be drawn. This value if only used if PosType parameter value is set to Custom.
  • y - Y-corodinate of the position where mask image should be drawn. This value if only used if PosType parameter value is set to Custom.

How to install it?

• Unzip NetImaging.zip file to extract NetImaging.dll file.
• Copy the DLL in folder where you want to install it.
• Using regsvr32 utility, register the component on your machine. Make sure that you have administrative previleges on the machine.
• Make sure that you have GdiPlus installed on your machine. If you don't have it, you can get the library from Microsoft.

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