Aspect ratio edit  box

Some two dimensional barcode types require the user to choose the height to width ratio of the final image (in terms of rows and columns of bars). Codablock and PDF 417 allow the user to specify the height to width ratio, and RSS (Expanded stacked) allow the width of the symbol in segment pairs to be specified..

For Codablock F symbols the desired height to width ratio for the symbol. dBarcode will do its best to comply - but will determine the final result within the limits set by the symbology. If a negative value of -4 or more negative, then the absolute value of the nearest integer is used to specify the number of data characters per row of the symbol. (This is useful if it is desired to generate several symbols of the same width.

For RSS Expanded stacked symbols this value repesents the width of the symbol in segment pairs. Fractional values are rounded to the nearest integer value.

For PDF417 symbols dBarcode allows the user to specify the desired height/width ratio of the target image by entering a positive value in the range 0.1 - 10.0, or to specify the desired ratio of the number of rows/number of codewords per row by entering a negative value.

Selecting Columns from the drop down list allows the user to specify the number of codeword columns to be used in the symbol (this value must be 3 or more).

Selecting Rows from the drop down list allows the user to specify the number of rows in the symbol (this value must be 3 or more).

In entering a value the user should bear in mind that, in general, PDF barcodes a best reproduced as tall thin images rather than short fat ones. Also the PDF417 standard requires a minimum of 3 rows.

This box will be greyed out for barcode types that do not support user-selected sizing.

 

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