PNG also supports transparency in index-color and true-color images. PNG supports three main types of images: grayscale images, true-color images, and index-color images. PNG was created to improve upon and replace GIF (Graphics Interchange Format) as an image-file format not requiring a patent license. PNG (Portable Network Graphics) is a lossless compression format for digital images. While PDF format has some drawbacks (such as the inability to edit the file without special software), overall it is a versatile and convenient file format. In addition, PDFs can be password-protected and contain many features that make them suitable for business use, such as the ability to add watermarks, comments, and form fields. PDFs are also typically smaller in size than other types of files, making them ideal for email attachments or for posting online. PDF files are designed to be platform-independent, which means they can be opened on any type of device. PDF, or Portable Document Format, is a file format that was developed by Adobe in the 1990s.

How to convert PDF to PNG online for free?.

Convert a set of images to a PDF document.

Both types of TIFF will of course be bigger than the tiffg4 output. The tiff24nc device creates 8-bit RGB color output. The tiffgray device creates 8-bit gray output. If your OCR can't handle TIFF G4 format (which I doubt), then you could generate other TIFF subformats with the help of Ghostscript. Your OCR results should now be much better than before. of later OCR, since it will create shades of gray around letters which don't help with this.

Your IM parameter of -depth 8 isn't suited to give good results from the p.o.v. will be much smaller than your un-compressed 300dpi from the IM commandline (and with 6120x7920 at 720dpi this happens to be letter-sized). parameter controls the absolute width+height of the output pages using 'device points'.

Here is a commandline that should work well for letter-sized pages of a multi-page PDF file: gswin32c.exe ^ Because ImageMagick uses Ghostscript anyway, in the background (the technical IM term for this is: Ghostscript is a 'delegate' for some of the conversions, such as PDF->TIFF). My suggestion is: use a Ghostscript commandline.

Linux imagemagick convert pdf to tiff