Batch resaving - advanced input

Dublove · 12 May 2022 at 14:17

Looking for an advanced batch image processing tool with two very specific requirements.

1 - Can work recursively through a very large & very nested folder structure.
2 - Input options, is able to ignore files under a certain file size.

Struggling with the second one for sure :-/.
The end goal I need is to simply resave as smaller filesize jpegs, to slash overall size at least in half.
Somewhere in the region of at least 250k images to deal with.

Anyone got any pointers?

thx Jay

Donnie Fisher · 12 May 2022 at 23:00

Are the originals jpegs, RAW ? And are you expecting the originals to be re-saved over themselves ?

Columbo · 13 May 2022 at 16:45

I use FastStone Photo Resizer to shrink and store my archived raw to .png to save space on my drives.
Not sure it does everything you need but I've never had an issue with with it and find it pretty quick.

Download FastStone Photo Resizer

JohnStewart · 16 May 2022 at 13:52

I’ve used a program called Advanced JPEG compressor for many years to batch compress images before uploading. I’m not sure if it can traverse nested Folders though, as I only ever use it on a single directory at a time.

it can resize images and offers customisable level of compression including lossless.

Donnie Fisher · 17 May 2022 at 13:06

A read online suggests irfanview has a strong batch conversion process that can handle recursive directory reading / saving.
I’m not sure about selecting image size as a option though.

Edit:
I installed it, and tried it ... at first glance it'll drill down through subdirectories and find all images, and I think it can either re-write over existing, or export to new directories.
It seems to work by scanning the directories and creating a txt file list of all the files you want to convert, then once your happy with the list, it'll churn through it.
It doesn't seem to be able to filter by size though, when you create the list.

However, it does have an option to import a txt file list of things you want to convert.

So it might be possible by other means to generate a .txt file of images and directories which are bigger than the size you want, then import that list and run it.

K.C. Leblanc · 25 May 2022 at 15:20

This CMD command will write the name and path of all jpgs into a text file ordered by size. While it's a bit bodgy you can then search for a file that's on the cusp and delete anything listed before.

Code:

dir /B /S /o:s *.jpg > textfile.txt