Trying to use shell command in ubuntu for image magick

Help! Predicate
1

hi I am using the shell() command in swi-prolog in ubuntu linux to send commands to the commandline to let Image magick convert images.

now i have this commandline below with in itself does work, it does what it has to do.( In linux back slash is treated as line continuation. )

when i construct the exact same String in swi-prolog en give this string to the Shell -predicate it doesnt work.

( i hope the forum displays the slashes of my command below )

What can i do to solve, ive tried a lot of things but doesnt work

convert /home/drspro/HSW_PICS_DA/set_pics_mach/tjscb.jpg \( -clone 0 -blur 0x1 \) \( -clone 0 -fill black -colorize 10 \) \( -clone 0 -define convolve:scale='!' -define morphology:compose=Lighten -morphology Convolve 'Sobel:>' -negate -evaluate pow 5 -negate -level 20x80% \) -delete 0 -compose over -composite /home/drspro/HSW_PICS_DA/cartoon_mach/result.jpg

2

This is not an answer but more info for others reading your question.

While I have used ImageMagick and IIRC used it from SWI-Prolog via command line I don’t ever recall seeing ( ) being used on the command line. So for others here is what I found

https://www.imagemagick.org/Usage/basics/#clone

3

Eric thankyou for your information,

it seems i have it working now, i accidentally added a space between - and clone in my prolog code, and with that it was standing still without error messages. but now it seems to work

4

Mostly should work fine. Note however that Prolog quoted atoms/strings require a \ to be escaped as \\. Prolog gives the resulting command to the shell.

Typically it is easier to use process_create/3 as you simply give a Prolog list of process arguments that the library makes sure the process is called the right way. So you get something like

    process_create(path(convert), 
                   [ file('/home/drspro/HSW_PICS_DA/set_pics_mach/tjscb.jpg'), 
                     '(', '-clone', '0', '-blur', '0x1', ')',
                     ...
                   ],
                   []).

Using the proper annotations, process_create/3 makes sure the same also runs on Windows.

5

i was aware of this and i used dubbel back slash inside the string in the swi prolog code, then when you use the same string in the shell command , it should output 1 backward slash i think, though when you use : term_string( Thestring , Output ), and you use write( Output ) you will get 2 back slashes