'Parameter for unsharpMaskImage to get Improved quality pdf after converting png to pdf

Image using converting png to pdf but the quality of created pdf is very low, so I am trying to sharpen the image using Imagick::unsharpMaskImage method but I am confused with the parameter of this function.

Can you share parameter(if any standard for pdf) or explain all these parameters and how to use them?

Thanks in advance.

phppdfpngimagick


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