PHP exec ImageMagick - magick convert not working ubuntu linux-CodePudding

I'm using ubuntu and have installed ImageMagick

identify -version

gives:

Version: ImageMagick 6.9.10-23 Q16 x86_64 20190101 https://imagemagick.org
Copyright: © 1999-2019 ImageMagick Studio LLC
License: https://imagemagick.org/script/license.php
Features: Cipher DPC Modules OpenMP 
Delegates (built-in): bzlib djvu fftw fontconfig freetype jbig jng jpeg lcms lqr ltdl lzma openexr pangocairo png tiff webp wmf x xml zlib

I tried:

exec('magick img.jpg ( -clone 0 -fill white -colorize 100 ) ( -clone 0 -color-threshold "gray(251)-gray(254)" ) -compose over -composite -quality 80% result.jpg', $output, $return_var);
echo '<pre>' , var_dump($output) , '</pre>';

also convert and magick convert instead of magick

then according to this answer I opened /etc/ImageMagick-6/policy.xml

and changed <policy domain="coder" rights="none" pattern="PDF" /> to <policy domain="coder" rights="read|write" pattern="PDF" />

but still doesn't work and $output always returns empty array

PS: I don't want to use the PHP extension, already did and it has some flaws

CodePudding user response：

Please do some testing in Imagemagick with PHP to see what your versions are. Please provide any messages that come back for each.

<?php
echo "<pre>";
system("type -a convert");  
echo "</pre>";
?>

<?php
exec("magick -version",$out,$returnval);
foreach($out as $text)
{echo "$text<br>";}
?>

Does this work?

<?php
exec('magick img.jpg \( -clone 0 -fill white -colorize 100 \) \( -clone 0 -color-threshold "gray(251)-gray(254)" \) -compose over -composite -quality 80% result.jpg 2>&1',$out,$returnval);
foreach($out as $text)
{echo "$text<br>";}
?>

What messages do you get?

CodePudding user response：

Convert writes its output to disk (result.jpg). The output argument of exec() if for any output to stdout. If you want the image data in$output specify an output file of -.

To quote the man page:

By default, the image format of 'file' is determined by its magic number. To specify a particular image format, precede the filename with an image format name and a colon (i.e. ps:image) or specify the image type as the filename suffix (i.e. image.ps). Specify 'file' as '-' for standard input or output.