Change Jpeg into progressive Jpeg Image

Question

I want to convert from base line Jpeg image to progressive Jpeg image.
There are 10,000 images stored in my Disk.
I tried one website but it is changing one at time.http://www.imgonline.com.ua/eng/compress-image.php But I want to convert them in bulk.

Is there any online tools or some programming techniques?
Then, let me know.

Thanks.

Answer 1

You can do that with ImageMagick which is installed on most Linux distros and is available for OSX and Windows.

Make a copy before experimenting on a small batch of images!

You can do a whole directory full of JPEGs like this:

mogrify -interlace plane *.jpg

Or, if you want to do one at a time:

convert input.jpg -interlace plane output.jpg

Or, if you want to do a whole directory and every subdirectory on Linux/OSX:

find . -iname \*.jpg -exec convert {} -interlace plane {} \;

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Or, you can use GNU Parallel on Linux/OSX if you want to get the job done faster. That goes like this:

parallel -X mogrify -interlace plane ::: *.jpg

If you want the output in a directory called "progressive", use:

mkdir progressive
parallel -X mogrify -path progressive -interlace plane ::: *.jpg

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You can also do it with jpegtran which is miles easier to install:

jpegtran -copy none -progressive input.jpg output.jpg