I just made a post copy-pasting images from another tab. All jpegs became pngs, for example 1.3MB became 6.4MB.
If I save the image first, then upload to Lemmy, it stays as a jpeg. What causes the pointless converting when copy-pasting? Can it be stopped from happening?
Only in simple images like graphs. Jpeg is smaller for photographs and paintings.
https://www.slashcoding.com/difference-between-jpeg-png/
The example I stated grew five times in size. The converter can see it was smaller before the conversion. Why not save the smaller jpeg?