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I tried install djview4 on a Mac using Homebrew, https://formulae.brew.sh/formula/djview4. The installation was without any errors or warnings, but when I try to do, for example, djview4 my_file.djvu or djview4 -help there is an error: zsh: command not found: djview4 Replacing djview4 with djview solves both issues, but as far as I know, djview and djview4 are two different utils.

When converting to PDF: ddjvu -format=pdf input.djvu output.pdf there is a warning: TIFFWriteDirectorySec: Warning, Creating TIFF with legacy Deflate codec identifier, COMPRESSION_ADOBE_DEFLATE is more widely supported. How can I use COMPRESSION_ADOBE_DEFLATE instead of delfate? I tried ddjvu -format=pdf -quality=COMPRESSION_ADOBE_DEFLATE input.djvu output.pdf but though -quality=deflate works, -quality=COMPRESSION_ADOBE_DEFLATE and its variations (e.g., AdobeDeflate) return the error message: ddjvu:...

ddjvu (DjVuLibre), 3.5.28: ddjvu --help returns -format=FMT Select output format: pbm,pgm,ppm,pnm,rle,tiff. Note that it doesn't mention PDF. But then, why does the folowing command works and converts input DjVu file to output PDF one? ddjvu -format=pdf -quality=85 input.djvu output.pdf