Re: Resize Barcode Image

Hello,
I am using LEADTOOLS V15.0.1.0 and .NET classes

to generate Barcode 2D PDF 417, then embed the image in PDF document using iTextSharp library,but
the image is very large.
I use functions in iTextsharp to scale the barcode
image



problem:

when I open PDF document by Adobe Reader ,It show message that "insufficient image data",

and the image is not appear.





I reduce image size by methods "searching google" but resolution is not good to read barcode by reader.





How can I solve this problem?How can I reduce image size without lose resolution?



Here is My code to generate Barcode Image:



public RasterImage writeBarcode(string barcodedData)

{

Bitmap bmp = new Bitmap(1200, 600);

for (int i = 0; i
{

for (int j = 0; j
{

bmp.SetPixel(i, j, Color.Red);

}

}

RasterImage image = new RasterImage(bmp);

BarcodeEngine barEngine = default(BarcodeEngine);

try

{

RasterSupport.Unlock(RasterSupportType.BarcodesPdfWrite, "MyCode");

BarcodeEngine.Startup(BarcodeMajorTypeFlags.BarcodesPdfWrite);

barEngine = new BarcodeEngine();



BarcodeData data = new BarcodeData();

Rectangle rc = new Rectangle(0, 0, 0, 0);

data.Unit = BarcodeUnit.ScanlinesPerPixels;

data.Location = rc;

data.SearchType = BarcodeSearchTypeFlags.Pdf417;



string[] barcodeText = null;

barcodeText = new string[1];

barcodeText[0] = barcodedData;

Byte[] encodedBytes = System.Text.Encoding.Default.GetBytes(barcodeText[0]);



data.Data = encodedBytes;

BarcodeColor barColor = new BarcodeColor();

barColor.BarColor = Color.Black;

barColor.SpaceColor = Color.White;



BarcodeWritePdf barPDF = new BarcodeWritePdf();

barPDF.AspectHeight = 0;

barPDF.AspectWidth = 0;

barPDF.Columns = 0;

barPDF.Rows = 0;

barPDF.EccLevel = BarcodePdf417EccLevelFlags.Level0;

//barPDF.EccPercentage = 50;

barPDF.Justify = BarcodeJustifyFlags.None;

barPDF.Module = 0;

barPDF.ModAspectRatio = 0;

barEngine.Write(image, data, barColor, BarcodeWriteFlags.InitializationReader, null, barPDF, null, null, Rectangle.Empty);

BarcodeEngine.Shutdown();

}

catch (BarcodeException ex)

{

throw ex;

///if (ex.Code.ToString().Equals("StringLength"))

//MessageBox.Show("Error in length");

}

//get used Width

int w = 0;

for (w = 0; w
{

if ((image.GetPixelColor(0, w).R == 255) && (image.GetPixelColor(0, w).G == 0) && (image.GetPixelColor(0, w).B == 0))

break;

}

int usedWidth = w - 1;



//get used Heigth

int h = 0;

for (h = 0; h
{

if ((image.GetPixelColor(h, 0).R == 255) && (image.GetPixelColor(h, 0).G == 0) && (image.GetPixelColor(h, 0).B == 0))

break;

}

int usedHeight = h - 1;



//copy used Pixels to another Image

Bitmap targetImg = new Bitmap(usedWidth, usedHeight);

RasterImage targetRasterImg = new RasterImage(targetImg);

for (w = 0; w
{

for (h = 0; h
{

targetRasterImg.SetPixelColor(h, w, image.GetPixelColor(h, w));

}

}

return targetRasterImg;

}

Any help please

I recommend 2 changes to your code:

1. If the image size (width and height) are too large, you can reduce it using Leadtools.ImageProcessing.SizeCommand Class. This class resizes an image to a new width and height.

2. To convert from a LEAD bitmap to a Windows Bitmap, do not copy the data pixel-by-pixel because this is very slow. Instead, use our RasterImage.ConvertToGdiPlusImage method as follows:
Image destImage1 = srcImage.ConvertToGdiPlusImage();

For more information about the SizeCommand Class and ConvertToGdiPlusImage method, please refer to the LEADTOOLS .Net documentation.

Thanks,
Maen Badwan
LEADTOOLS Technical Support

Thanks for your replay..<br />
Regarding convert from LEAD bitmap to Windows bitmap, Thanks for your attention,I used "copy px-by-px"to remove unused pixels (red pixels in my code) not to convert the image,but I did not return the bitmap.<br />

Leadtools.ImageProcessing.SizeCommand sizecmd = new SizeCommand(300,150,RasterSizeFlags.None);<br />

sizecmd.Run(targetRasterImg);<br />

Is this code right?

Thanks,
Eiad Taha
Software Engineer

The code snippet looks correct. To get better quality when resizing your images, try to use RasterSizeFlags.Bicubic or RasterSizeFlags.Resample Flags instead of None.

Thanks,
Maen Badwan
LEADTOOLS Technical Support

Will RasterSizeFlags work better for images,surely make use of it.Thanks.