ImageMagick command to convert and save with same name

Question

I am using ImageMagick convert command for making thumbnails & save the converted images in another directory, one by one, in PHP.

But, cant figure out how to keep the the image name in the converted image.

> convert 1.JPG -resize 120X120 thumb/*.JPG

need to keep the output file names same as the input. Please help.

Corie

Answer 1

A simple solution would be copy, followed by mogrify - another imagemagick tool - this will keep the same names, it takes all the same args as convert.

cp *.jpg thumb/
cd thumb
mogrify -resize 120X120 *.JPG

Alternatively you could do a bit of shell scripting, using find -exec or xargs

# using -exec
find . -iname "*.JPG" -maxdepth 1 -exec convert -resize 120x120 {} thumbs/{} \;

# using xargs
find . -iname "*.JPG" -maxdepth 1 | xargs -i{} convert -resize 120x120 {} thumbs/{}

Hangout

thanx man. it worked. Will check out the exec & xargs also. thanks again. – Corie

Answer 2

Another way:

convert *.jpg -resize 80% -set filename:f '%t' ../'%[filename:f].jpg'

Will place converted files in the folder above.

The option -set filename:f '%t' sets the property filename:f to the current filename without the extension. Properties beginning with filename: are a special case that can be referenced in the output filename. Here we set it to ../'%[filename:f].jpg, which ends up being the image filename with the extension replaced with .jpg in the parent directory.

Documentation references:

• -set documentation, which mentions the filename: special case
• %t and other Format and Print Image Properties

Fritzie

For some reason, this doesn't work for me when the output is .webp. – Mirella

This should work indeed, but also in my case doesn't work (Windows 11, WebP); it instead just creates a single big file. – Differential

Answer 3

Another easy way that doesn't involve a lot of typing is GNU Parallel:

parallel convert {} -resize 120X120 thumb/{} ::: *.jpg

convert is called for each of the files given after :::, and {} is replaced with the file name for each invokation. This will also process the files in parallel, so it's likely a lot faster than the other solutions here.

It also works if you want to convert the file type:

parallel convert {} {.}.png ::: *.jpg

{.} is replaced with the filename without extension, allowing you to change it easily.

Eng

Answer 4

Here's what I do:

Convert all files to filename-new.extension

for FILE in *; do convert -resize 320 $FILE $(echo $FILE | sed 's/\./-new./'); done

Move all filename-new.extension files back to filename.extension:

for FILE in *; do mv $FILE $(echo $FILE | sed 's/-new//'); done

Teetotal

Answer 5

In Windows, do this instead:

FOR /f "tokens=*" %G IN ('dir /b *.jpg') DO convert %G -resize 120x120 thumb\%G

Notes:

• Make sure you create the thumb folder in advance.
• Use %% intead of %, if you make this part of a batch (.bat) file.
• A benefit over doing it all at once with one convert is that this is more memory efficient, probably..

Differential