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I am converting multiple jpg images to a single PDF using following command

convert *.jpg mybook.pdf

but the pdf quality is not good.

Is there a way to retain the original quality of images in the pdf?

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You might want to try using software like Adobe Acrobat, but there is no way to create quality in an image. Consider uploading to Google Docs, and then re-download the images as a PDF (if you don’t already have Adobe Acrobat).

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Let's suppose your original images are with a definition of 300 dpi. You can use

convert -set units PixelsPerInch *.jpg -density 300 -page 2647x3745+0+0 mybook.pdf

It's possible to choose the density, the geometry of the page and so on...

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