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anonymous

Barcode Size not accurate - 1CM does not exactly equal 1CM

How do I adjust the size of the barcode if the dimensions are not accurate. For example 1 CM does not equal 1 CM?


03-29-12     2704 day(s) ago    

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anonymous

Best Answer

Most web browsers print from the screen image at 38 dots per CM or 96 DPI. In addition, JDK 1.1 to 1.2 applications always print at 96 DPI. However, the limitations can be solved in a few different ways:

1.
If you are using the Java Servlet - the servlet creates a JPEG image at 300 DPI resolution in the web browser. However, the web browser views this at 96 DPI. Since you are using the IMG tag to embed the servlet into HTML, it may be compressed or expanded as necessary. The minimum x dimension (narrow bar width) of the Java barcode is usually .03CM (about 10 MILS or 1/96"), and because we are reducing the area it is presented in, the x dimension will be .015CM or about 5 MILS. Remember, because the screen resolution is 96 DPI, it will not look correct on the screen but it will print correctly because most printers have a DPI of 300 or more. For example, the code below reduces the image by 50%:
<IMG height=40 alt="Barcode Image"
src="http://localhost:8080/examples/servlet/LinearServlet?HEIGHT=80&WIDTH=160&BARCODE=12345678"
width=80>

2.
If you are using JDK 1.3 or greater and printing from the Java application itself - the printer resolution may be set. Refer to the java.awt.PageAttributes.setPrinterResolution() in the jdk1.3 documentation.

3.
JDK 1.3 Example - an example of an application that prints with printer resolution and uses Java 2 (JDK 1.3) is in our Maxicode Java Package that may be downloaded here: https://www.idautomation.com/java/IDAutomation2DJavaDemoPack.zip The file you need to look at in this package is ApplicationExample.java.

4.
When creating images for graphic applications, set the resolution to 118 to create a 300 DPI image.

5.
The resolution used to convert to pixels can be changed by using the method setPixelsPerCM(int) or resolution(int). By default this value is the screen resolution of pixels per CM. If resolution is set to 1, then 1 CM will equal 1 pixel.

Posted 2704 day(s) ago

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