Image Compression

[Eadwine Rose]

you find the script helpful, I don't.

To each their own, I agree.

What worries me that this is mislabeled, there's a huge difference between compression (even lossy) and resizing.

I'd say a mod can change the thread title to correctly display what this does.

[davidy]

This programme is nothing more than a batch to convert images to a certain size. The fact that an 800x600 image requires less space than a 6000x4000 image needs no explanation.

The trick is to reduce the file size without changing the dimensions and without any noticeable loss of quality.
With JPG, you quickly come up against system-related limits.
PNG is lossless, but doesn't even come close in terms of file size.

Experience shows that the most space is saved by deleting RAWs and/or JPGs that you will never use (and there are quite a few).

With appropriate processing (which cannot be realised in a batch), you can also reduce the file size of JPGs without loss, or even with a qualitative gain. I only mention keywords such as denoising and smoothing out tonal value breaks.

An uncompressed Sony ARW (alpha7III) of 47MB+20MP JPG (superfine 98%) becomes a perfectly processed 5MB JPG (still 4000*6000px) with which you can print posters the size of a square metre. And because you don't need it anymore, you throw away the ARW and the superfine JPG and keep the most pleasing processing, bang 60MB saved on one image.

Compressing JPGs with as little loss as possible used to be an "art" that website/blog operators practised to excess because the data transfer rates of analogue modems and later ISDN were not really great.
I live in the country, until 2012 there was only DSL Light, download rate 384 Kbit/s, which is a far cry from the vdsl 50 I had in the company since 2015.

No JPG compressor introduced since 2000 lived up to its promises. NONE! But there were a few formats that were interesting, but never caught on in the market and at some point it became uninteresting, the compression rates/codecs for videos, as they represent the main load of data transmission in the WWW, became more important than any image compression.

ps: some of my UHD+WQHD and UHD only wallpapers also have only 500-800kb, but I do such tasks as denoising and smoothing out tonal value breaks in the software I use on the side.

Light is a medium of compressed knowledge waiting to be unfurled.
I also compressed all the artwork in my music collection as well as in my calibre db. I saved 12.2GB in music artwork in one copy alone.
Protip: If you are transferring a huge folder of small files, such as your calibre library to your phone, zip it first and then transfer that. Mixplorer will then extract it almost as fast as the original transfer itself. I have well over 5000 books so mine is large. Straight copying from the pc to the phone would have taken foreeever.