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@Tex2002ans
Thank you so much for your comments which comfort me using Imagemagick and png format for the task at hand. I shall trust Imagemagick outputs when using basic parameters above (quality, density) and leave aside all others options that could possibly lower down the image quality (as cleanup).
After all, the only goal of this stage is to get a png image that can be later processed with scantailor.
I did this kind of conversion with two different pdf scans from Gallica. The size of the output .png files varied widely from 26k (1st book) to a whopping 1.7mb (2d book)! As this difference can also be noticed using online conversion services, it can only be explained by the nature of the pdf.
Happily, this oversized files are only of temporary use because later the scantailor process outputs to standardized and much lower size .tif images.
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