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PDFRasterDPI

PDFRasterDPI is a parameter to specify the resolution used for rasterizing a PDF file. It is defined as below:

Value Type	Value Range	Default Value
int	[100, 600]	300

Remarks
When decoding a PDF file using DecodeFile method, the library will convert the pdf file to image(s) first, then perform barcode recognition.

Setting Methods

PDFRasterDPI is supported to be set through RuntimeSetting or JSON template.

As `PublicRuntimeSettings` Member

PDFRasterDPI can be set dynamically during runtime as a member of PublicRuntimeSettings struct.

Code Snippet in C++

//...other codes
PublicRuntimeSettings* pSettings = new PublicRuntimeSettings;
int errorCode = reader->GetRuntimeSettings(pSettings);
pSettings->pdfRasterDPI = 300;
reader->UpdateRuntimeSettings(pSettings);
delete pSettings;
//...other codes

See Also

PublicRuntimeSettings: JavaScript | C | C++ | .NET | Python | Java | Java-Android | Objective-C & Swift

As JSON Parameter

PDFRasterDPI as a JSON parameter is a number value defined as below.

Key Name	Key Value
PDFRasterDPI	A number from [100, 600]

JSON Example

{
    "PDFRasterDPI": 300
}

Impacts on Performance

Speed

Setting PDFRasterDPI to a smaller number may speed up the process.

Read Rate

Setting PDFRasterDPI to a larger number may improve the Read Rate.

Accuracy

PDFRasterDPI has no influence on the Accuracy.