Re: gm convert bla.jpg bla.pdf multiplies SEVENFOLD the file's size !

On Sun, 9 Dec 2018, Mehdi wrote:

> The size is still a big problem, with "preserve-settings", the size is
> between four and fivefold the sum of pictures files. Its number limit is
> now between 260 and 280 files, or in term of total size, 111 and 127 Mo.

Unfortunately you did a wrong thing by reducing your input files using 
'-quality 7'.  The resulting images require just as many pixels as 
before (rows x columns) and so the decoded image takes just as much 
memory after it has been read.

It is better to reduce the pixel resolution since the total number of 
pixels is what consumes the memory.  It can also help to reduce the 
number of gray levels used since this improves compression.

Your Kindle may have a high DPI specification but it is optimized for 
reading text and is not able to show many shades of gray.

Bob
-- 
Bob Friesenhahn
[email protected], http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/
Public Key,     http://www.simplesystems.org/users/bfriesen/public-key.txt