using ImageMagick, what command should i use to convert a PDF to PNG? I need highest quality, smallest file size. this is what I have so far (very slow by the way):
convert -density 300 -depth 8 -quality 85 a.pdf a.png
Looking at what Gmail does when a user "view" a PDF, the quality is awesome and the file size very minimal. The DPI is just 96 (I have to set a density of 300 to get anything decent). Anyone know how GMail does it? Thanks.
Avi Pinto
when you set the density to 96, doesn't it look good?
when i tried it i saw that saving as jpg resulted with better quality, but larger file size
Reducing the image size before output results in something that looks sharper, in my case:
convert -density 300 a.pdf -resize 25% a.png
来源：https://stackoverflow.com/questions/2869908/convert-pdf-to-png-using-imagemagick