The text recognition engine in OCRXpress for Node.js has a default resolution of 300 DPI for an image. Not all input images specify the resolution. So, the recognizeParams structure has a value that allows you to set the default resolution to be used during the recognition process:

• Set the desired dpi value in the parameters structure passed to recognize().

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  // Set the default DPI to 200. params = { defaultDpi: [200, 200] };