Hi,

PV version is 5.4.1
when making a png screenshot in PV with a resolution of 3840x2160, the file 
size I get with default settings is ~1.4MB. This is due to the fact that around 
80% of the image are plain white space. So far, so normal.
However, when I create an animation and export to png images with the exact 
same default settings for image quality, the image file size for the exact same 
scene is ~28MB.
Only when I dial down the image quality manually to around 60 the file size 
becomes similar to the png file from the screenshot. And the image quality is 
not visibly worse than with 100% setting.
This must be some kind of bug, I never had this issue with previous versions.

tl;dr: png image file size differs greatly between screenshot and animation 
with the exact same default settings.

Regards
Alex
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