About compressing digital images for storage

[Stephen Liu]

(06-13-2022, 07:33 AM)PixLab Wrote:

(06-13-2022, 07:18 AM)Stephen Liu Wrote: Hi all

I'm going to scan about 1,000 photos to digital images.  On testing I found the size of each digital image is about 2.0MB.  

I can compress its size to about half, 1.1MB on GIMP;
File -> Export As -> Select File Type (By Extension)
file type - jpg
-> Export
Export Image as JPEG
Quality --> 85

The final compressed size of the digital image = 1.1MB

Would the compressed image files affect their future use?  I won't print them but use them on digital album, digital slideshow, posting on websites etc.

Please advice.

This type of compression, definitively yes, you will never get back information's loss.
JPEG is a lossy format that offers a higher compression rate than PNG in the trade-off for quality ➤ you are trading quality for smaller size with jpg, in other words, smaller a jpg is ➤ less quality from the original it has

(06-13-2022, 07:18 AM)Stephen Liu Wrote: Besides I'll further compress and archive all digital files running "gzip"

Thanks

Regards

This type of compression, no, it's a completely different type of compression https://www.youtube.com/watch?v=Mjab_aZsdxw
I would use 7z to compress instead of gzip, let say it's a personal choice. https://en.wikipedia.org/wiki/7z

Thanks for your advice

On smartphone scanning photos, the format of the output digital files is .jpg.  I'll try the second time later to check whether I can select the output format as .png

I have another though not compressing the digital files on GIMP only with gzip or 7z

I don't have 7zzip running Ubuntu 20.04.  I'll run snap to install it later.

$ sudo snap install p7zip-desktop

Regards