Large Thumbnails size in the files app

[gas85]

You can generate smaller previews to safe time and bandwidth. Here I wrote small script to use in cron job How to know if Preview Generator is working? - #6 by gas85. And then:

@gas85

Fist of all you have to adjust what kind of previews you would like to have. I have had the same problem and have to setup my config.php as following to have only FullHD previews maximal (default is 4096):

@gas85

And remember, after you change the config, you have to regenerate previews again. Here is a good explanation how:

After that you will have nice small previews:

But somehow you are right, I checked and there are still previews around 1 and 2 MB (not all of them), that is strange…

Seems that some previews were not pregenerated, then access to the file generates new file, but in png instead of jpg and it is quite big:

# du -ah preview/ | grep -E "png|jpg" | sort -h -r | head -n 20
2.9M	preview/806331/1536-1024-max.png
2.8M	preview/2823/1528-1044-max.png
2.7M	preview/2899/1527-1080-max.png
2.5M	preview/944452/1920-1080-max.png
2.4M	preview/2506474/1920-1080-max.png
2.4M	preview/1593491/1620-1080-max.png
2.3M	preview/333955/1660-1080-max.png
2.3M	preview/2503143/1190-893-max.png
2.1M	preview/1593493/1620-1080-max.png
2.0M	preview/2952315/1920-1080-max.png
2.0M	preview/2503144/1190-893-max.png
1.9M	preview/2790359/810-1080-max.png
1.9M	preview/1593492/1557-1080-max.png
1.8M	preview/2503151/1920-825-max.png
1.7M	preview/944586/1500-1000-max.png
1.7M	preview/942970/1500-1000-max.png
1.7M	preview/802162/1536-1024-max.png
1.7M	preview/330791/1500-1000-max.png
1.7M	preview/2503150/1190-893-max.png
1.7M	preview/1593629/1854-1080-max.png

and pre generated previews are in JPG, they are pretty ok:

# du -ah preview/ | grep "jpg" | sort -h -r | head -n 20
552K	preview/4588842/1919-1080-max.jpg
544K	preview/4587449/1734-1080-max.jpg
536K	preview/4588844/1919-1080-max.jpg
528K	preview/4588738/1919-1080-max.jpg
516K	preview/782965/1920-1080-max.jpg
512K	preview/72740/1920-1080-max.jpg
512K	preview/6190/1920-1080-max.jpg
512K	preview/4588762/1919-1080-max.jpg
512K	preview/4588693/1919-1080-max.jpg
500K	preview/4588735/1919-1080-max.jpg
500K	preview/2788724/1440-1080-max.jpg
500K	preview/1057309/1920-1080-max.jpg
496K	preview/4588731/1919-1080-max.jpg
496K	preview/4535176/1919-1080-max.jpg
496K	preview/2788709/1440-1080-max.jpg
488K	preview/12135/1920-1080-max.jpg
484K	preview/4588843/1919-1080-max.jpg
484K	preview/4586368/1919-1080-max.jpg
484K	preview/2782961/1440-1080-max.jpg
480K	preview/77330/1920-1080-max.jpg