Imagemagick
Imagemagick is a commandline program/utility that can be used to perform a variety of image manipulations. It supports most image formats. It also has programming apis for various languages like php, python etc making it easy to use as a library.
Install
Feb 13, 2017 - What is your Mac OSX. The binary for IM is only for Mac OS X El Capitan. If you are not on El Capitan, then I suggest you install from Homebrew. ImageMagick installer for Mac OS X The installer puts ImageMagick into /opt/ImageMagick and adds it to your PATH by creating an entry in /etc/paths.d/. These ImageMagick installers include the following delegates: bzlib fftw jng jpeg lcms lzma png ps tiff xml zlib, and now includes support for webp.
On ubuntu install it by typing the following in a terminal
For windows get the binaries from the website.
Pdf to image
Web applications dealing with pdfs sometimes need to create a image or thumbnail of the uploaded pdf. Over here we are going to use imagemagick to convert pdfs to images.
The simplest command to do the task is ..
The above command shall generate the jpg format image from the pdf file. If the pdf file has multiple pages then imagemagick shall create multiple image files named as demo-1.jpg, demo-2.jpg .. for as many pages as there are in the pdf file.
To convert only a particular page from the pdf file use the following command
The 2 in the bracket indicates the index of the page. 0 means the first page and then increment 1 for each page.
Creating thumbnails
To create thumbnail, the image just needs to be scaled down using either of the 'scale', 'thumbnail' or 'resize' option. Here is a quick example.
The above will create a thumbnail image of height 300px and correct width according to aspect ratio of the original pdf.
If the pdf has transparency then scaling might result into an image where all white areas turn into black. To fix this the 'flatten' option can be used as follows
The above command shall put a white background in the transparent areas.
Clearer text
Using the above command you might notice that the text in the resulting image is not clear or sharp. This can be fixed using the 'density' option. Use a value of around 175 and the text should become clearer than before. Experiment with the value till the desired level of sharpness is achieved.
Create gif animation of all pages
Imagemagick can even create a gif animation of all the pages of the pdf. How do i restore the homepage on google chrome for mac. Its as simple as the following command
The delay parameter defines the delay of animation.
Quality/compression for jpg
The quality or compression level of jpg images can be specified using the 'quality' option
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Higher quality image would have lesser compression and larger file size as a result.
Hi, I have the ImageMagick binaries installed. They are working in the terminal. But when I try to use it out of a php script on the webserver, it cant find the DYLDLIBRARYPATH. The manual says: Set the MAGICKHOME environment variable to the path where you extracted the ImageMagick files. For example: export MAGICKHOME='$HOME/ImageMagick-6.3.7' If the bin subdirectory of the extracted package is not already in your executable search path, add it to your PATH environment variable. For example: export PATH='$MAGICKHOME/bin:$PATH' Set the DYLDLIBRARYPATH environment variable: export DYLDLIBRARYPATH='$MAGICKHOME/lib' I can do all this in the Terminal, but how and where do I set it, that it also works with the scripts on the webserver?
Thanks and Regards, JO. Joachim, I have not tested any of this but.
If you are just using the default Mac OS X Server install of Apache and the PHP module, then Apache's path is /usr/bin:/bin:/usr/sbin:/sbin (when running under the user:group=www:www). Basically, if the server is running under that user and PHP inherits the basic PATH of that user's shell, then anything linked into those directories should be available to the scripts, i.e. Link your ImagMagick bin and lib paths into /usr 's directories. See 'man ln' in Terminal. User www doesn't have a defined shell, though, so I don't know where the PATH comes from. Alternatively, you might be able to use Apache's envmodule (on by default) to manipulate the PATH environment variable in a config file.
See Apache's manual on environment variables. Another means is to utilize 'suexec' in Apache and switch the user:group of CGI execution, etc. To a actual user with a definable.bashprofile (or whatever shell you are using). There are security concerns with this. See Apache's manual on suexec. You may want to also consider compiling PHP as CGI.
BTW: the new version of PHP has some new experimental native ImageMagick libraries built in. I assume it looks for the binaries in the usual places and/or may need to be compiled with their paths during./configure.
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