Legacy ImageMagick Discussions Archive

That helps a lot... thank you, snibgo!

I see, thanks... Is there some kind of tutorial out there to help me understand what a sensible density setting is for a given image? "identify verbose input.png" gives me a ton of output. "identify -verbose input.png | grep -i 'resolution'" gives me "Resolution: 0.15x0.15" but I have no idea what ...

Here is an example image. Call it input.png. Here is the result I get from "convert input.png output.pdf". Depending on the PDF viewer I use, the resulting PDF is either a) blank or b) displays at an extremely high resolution, so that I have to zoom to less then 1% to read it. Setting "density" or ...

Thanks for the tips, pipitas. I'm just going to stick with Group4 and forget about JBIG2. Knowing about `pdfimages -list` is also a big help.

This one gives me a file about the same size as the original: convert input.tif -compress Group4 -density 300 -type bilevel TIFF:- | convert - output.pdf I saved a fair bit of space without too much loss in quality like so: convert input.tif -compress Group4 -adaptive-resize 75% -density 200 -type ...

These are helpful suggestions. I am already finding that resizing the TIFF first and then converting to PDF in a separate step seems to make difference. I'll keep experimenting for now.

I do see JBIG2 on the list when I do `convert -list compress` but every compression option I have tried seems to give the exact same result. I have also tried the depth option: convert input.tif -compress JBIG2 -density 300 -depth 8 output.pdf But again, the resulting output is also exactly the same ...

I have a bunch of scanned monochrome images like this: input.tif TIFF 3184x5276 3184x5276+0+0 1-bit Bilevel DirectClass 104KB 0.000u 0:00.000 I want to make a PDF which will not be so large. From what I understand JBIG2 compression is the best available for monochrome PDFs. So I tried this: convert ...

I was going to start a new question but this discussion seems closely related. I have an image like this. Format: JPEG (Joint Photographic Experts Group JFIF format) Class: DirectClass Geometry: 2560x1280+0+0 Resolution: 300x300 Print size: 8.53333x4.26667 Units: PixelsPerInch A density of 300 ...

Thanks, that helps! Now I see it labelled as such, way down near the bottom of the `-verbose` output:

Here is an example of identify's basic output, from the ImageMagic website:
What do the "0.000u" and "0:00.000" represent?