Ive downloaded imagemagick and used the convert program to make them smaller.
convert -quality 85 input.jpg output.jpg
should make it smaller, the 85 is a % factor which determines how much compression the algorithm uses. 100% is big files with high quality, the default is something like 92% .
Ive downloaded imagemagick and used the convert program to make them smaller.
should make it smaller, the 85 is a % factor which determines how much compression the algorithm uses. 100% is big files with high quality, the default is something like 92% .
also adjusts the resulting image size.
For the image i used, it was 3840*2160 and 3.0 meg. When compressing with 50% quality, the file size was 850kb, when resizing down, it was 250kb,
How much each file size shrinks with % compression will likely depend on what the image is.