I'm using ImageMagick programmatically to apply some user-defined transformations to an image. The script I'm using spawns a new process and runs ImageMagick with arguments similar to:
convert /tmp/source -resize 100x /tmp/transformed
And then it reads the transformed image back from /tmp/transformed. I'd like to add the option to convert the image to another image format, but from looking at the IM docs for a while, the only way I can see of doing that is to append the output destination with .<ext>, like this:
convert /tmp/source -resize 100x /tmp/transformed.png
Is there another way? The easiest way for me to do this with the pre-existing script is to supply an argument, but I can't find it. Something like:
convert /tmp/source -resize 100x -format png /tmp/transformed
Is this possible? Or am I stuck with having to append the extension to the output destination?
I'm not sure what your aversion is for appending a suffix, but another alternative to Fred's excellent suggestions is to use a "format specifier" prefix, which would leave your base filename unchanged - if that is what you are trying to achieve.
convert Image -resize 100x PNG:/tmp/transformed/Image
Substitute PNG: with GIF:, JPEG: etc to suit.
-format png is used in mogrify and not convert as I understand it. You need to specify the suffix for the input and the desired suffix for the output in the input and output filenames.
convert /tmp/source.suffx -resize 100x /tmp/transformed.png
assuming png is the desired output format.
Perhaps I misunderstand what you want. If so, please clarify. Are the suffixes in the source and transformed variables? If so, you can use IM to separate the source filename from its suffix using %t and %e in string formats. But for the output, you would have to parse that using your file system. See http://www.imagemagick.org/script/escape.php
Alternately, use mogrify which supports -format png
mogrify -format png -resize 100x *.suffix
That will take every file in the input directory with suffix .suffix and convert that to png. However, I would suggest you create a new directory to hold all your output images, since as it is, it will overwrite your input files. You would then need to add -path path2/newdirectory to the command above. see http://www.imagemagick.org/Usage/basics/#mogrify
What are the actual filenames associates with source and destination? Are these just variable for the real filenames?
Related
I can't seem to find a way to properly convert my images to bmp using imagemagick. Whenever I use this website with the current settings it works flawlessly in my program. https://online-converting.com/image/convert2bmp/
I've tried these commands:
convert disney.jpeg -format bmp:format=bmp4 out.bmp
convert disney.jpeg -define bmp:format=bmp4 -type truecolor -compress none out.bmp
Nothing seems to work. Not sure how to set up imagemagick so that it gives me back the same format as the website.
As for the program, you basically feed it the bmp file. It works when I convert with the website, but not with imagemagick.
I'm talking about this metadata:
I know that this command:
magick mogrify -strip image.jpg
can clear all the info. But I don't know is it possible to write some metadata with ImageMagic?
It seems like magick identify -set can probably do what you have in mind - I just need a minute to test it myself, here's the corresponding part from the man page of identify:
-set attribute value set an image attribute
I'll edit my findings into this answer in a few mins :)
Edit:
This seems to work:
convert input.png -set new_attribute "attribute value" output.png
At least it works according to imagemagick's identify -verbose, I can't test if these properties show up on windows too.
It should also be simple to overwrite other metadata, simply by first finding the actual key with identify -verbose, I guess.
For more information, here's the official documentation:
https://www.imagemagick.org/script/command-line-options.php#set
I am trying to generate an image that is 1px wide and 100px tall of a gradient, which goes from white to #3532CB, and then save it in my directory as topgrad1.png
After changing the directory to the image folder in cmd.exe, I entered:
convert -size 1x100 gradient:white-#3532cb topgrad1.png
When entered, it gives the result of: Invalid Parameter - 1x100
How can I solve this?
That error indicates you're accessing a Windows command "convert.exe", probably in the "C:\Windows\System32\directory". You need to make sure your ImageMagick's "convert" command is in your PATH, or call your IM "convert" with the full path. Or if you're using IM7, you should be using "magick" instead of "convert" anyway, and still make sure it's in your PATH.
In Imagemagick, at least on Unix systems, you need to quote your colors, especially if using hex or rgb(...) colors. So
convert -size 1x100 gradient:"white-#3532cb" topgrad1.png
I am converting .psd to .png files inside folder with one. How to keep same name of every file in folder with different extension ?
For example I enter in folder images and then from terminal I execute
$ convert *.psd *.png
but it gives names to .png just numbers not the same as appropriate .psd image.
Use the -set and formatting options.
convert *.psd -set filename:base "%[basename]" "%[filename:base].png"
See "Long Form Attribute Percent Escapes" and "Filename Percent Escapes" docs.
Update
The mogrify utility that ships with imagemagick can also be used.
mogrify -format png *.psd
Note: Be careful with mogrify as the docs state...
This tool is similiar to convert except that the original image file is overwritten (unless you change the file suffix with the -format option) with any changes you request.
If you are on Linux, Unix or Mac OSX, you could use in a terminal window with Bash shell:
for i in *.psd; do
convert $i ${i/.psd/.png}
done
I deliberately do not advertise mogrify any more. It is too dangerous for every user who doesn't know it already, and who comes to this website to ask for help. mogrify is overwriting your original files in some cases (of course not when converting PSD->PNG)
Or, even simpler:
mogrify -format png *.psd
I like the top answer,
that being said, in later versions of ImageMagick, the command is
convert *.psd -set filename:basename "%[basename]" "%[filename:basename].png"
as also mentioned by #jan-glx and #jomel imperio
i'm using the convert tool from imagemagick to convert images to the jpeg-xr format.
i'm using the latest version under debian linux (ImageMagick-6.8.6-8).
The problem is convert -format jxr or convert -format wdp produce the same format as my source image and no valid jpeg-xr file.
Is my -format parameter wrong? i didn't find anything about it
thanks in advance
The -format option is for outputting metadata in a specific format, not selecting the output file format.
Selecting a specific output format is done by prefixing the output filename with the tag described at http://www.imagemagick.org/script/formats.php, so for example
convert input.jpg jxr:output.jpg
Normally, imagemagick detects the output format based on the file extension you chose for your output file, so by choosing .jxr as your file extension it should automatically use the JPEG-XR format.