MobileRead Forums - View Single Post - k2pdfopt: optimizes PDFs for viewing on e-readers

willus · 08-25-2021, 10:10 AM

MarjaE — try using -idpi -1 — that will force the input and output dpi to remain the same and thus k2pdfopt will not change the resolution of your .png file:

k2pdfopt -mode copy -idpi -1 myfile.png

By default, the input dpi is 2x the output dpi (-idpi -2), which results in k2pdfopt resampling your image at half the resolution if supplied with a .png file unless you are careful to specify output resolution, width, and height all together.

If you specify -odpi on the above command also, it will set the size of the PDF page.

08-25-2021, 10:10 AM	#1885
willus Fuzzball, the purple cat Posts: 1,303 Karma: 11087488 Join Date: Jun 2011 Location: California Device: iPad	MarjaE — try using -idpi -1 — that will force the input and output dpi to remain the same and thus k2pdfopt will not change the resolution of your .png file: k2pdfopt -mode copy -idpi -1 myfile.png By default, the input dpi is 2x the output dpi (-idpi -2), which results in k2pdfopt resampling your image at half the resolution if supplied with a .png file unless you are careful to specify output resolution, width, and height all together. If you specify -odpi on the above command also, it will set the size of the PDF page.