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Less data = heavier file ?
#1
I just noticed that putting layers in a group layer makes a noticeably heavier xcf (in my test an xcf went from 1.2 to 1.5 GB).

But it gets more interesting : if your layers have masks and you think you can save some space by deleting them and putting a single mask for the group, it will still be heavier than when you had individual masks (even if the masks were different). In other words you'll have less data to work with but the file will be heavier.
I don't understand why. Does anyone know?
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#2
This is the image size shown at the bottom of the Gimp Window ? - The size in memory

My guess, and it is only a guess.

This also shows any memory used by "undo" Even when undo levels are set to zero, if there is memory allocated it will be used. Look in Edit -> Preferences -> System Resources for those settings.

Adding and moving into a layer group does add the equivalent of a couple more regular layers at least it does here. Adding a mask to the layer group however is neutral.
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#3
(07-31-2020, 09:56 AM)rich2005 Wrote: This is the image size shown at the bottom of the Gimp Window ? - The size in memory

No it's the file size as shown by my file browser after the xcf has been saved and closed.

It can't be caused by the undo steps because if I do it in inverse order (start from group version and make individual masks version), the group version is still heavier.
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