> In the settings of IrfanView I've seen, that I can configure the DPI to load 
> a PDF with, but there is no setting to load with the original DPI. This I 
> consider as a bug.

I don’t think it can be considered a bug, but a characteristic. PDFs are 
metafiles, they can contain raster content, vectorial content, or both. 
Vectorial content, by definition, doesn’t have a “original DPI” (or, more 
correctly, PPI – Pixels Per Inch. DPI is a concept related to printers, which 
typically use multiple dots per pixel). Being a raster image program, you need 
to tell IrfanView the resolution to use when rasterizing a PDF.

Even Photoshop asks you for a target resolution when opening a PDF file.

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