Resolution in image to pdf conversion

Hi, I am having some printing/resolution issues when converting tif to pdf.  When I print the pdf, the text comes out small (not the size of the page or how it looked as a tif). I am not sure what is the correct value to set for resolution and do not understand the readme document regarding this.

-r [resolution]    : set resolution in generated pdf file
-r  0           : use the default image width and height information
-r -1           : take over DPI info from original images

Please explain -  What is the ‘default image width and height’? what other values can I set for –r besides 0/1 so that the page always prints correctly?
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>>Please explain -  What is the ‘default image width and height’?

"default image width and height" option will read image width and height from input image file, set the image width and height to output PDF file, for example, if input image file's width and height are 1000x2000 point, you will get a PDF file paper size at 1000x2000 point.

>>what other values can I set for –r besides 0/1 so that the page always prints correctly?

You can set 100, 200, 300, 600 or any DPI resolution to "-r" parameter.

VeryPDF
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When setting the resolution to 300 dpi, which is the setting that our previous software was using, the pdf still prints incorrectly (small height and width). Does this have to do with your default a4 paper setting? We need it to be 8 1/2 x 11 always. Is there a way to specify paper size?
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VeryPDF Image to PDF Converter hasn't an option to create PDF file at A4 paper, however, we suggest you may download another version of Image to PDF Converter from our partner's website to try,

http://www.imagepdf.com/image-to-pdf.htm

this product has -width and -height parameters, you can use these parameters to create PDF file at A4 or Letter or other paper size, for example,

img2pdf.exe -width 595 -height 842 -quick C:\test.tif C:\out.pdf

img2pdf.exe -width 612 -height 792 -quick C:\test.tif C:\out.pdf

VeryPDF

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