Layer groups internally create a virtual layer representing their entire composited contents to speed up overall rendering of the image (at the topmost levels); a similar thing already occurs when you have a project containing text layers.
Alternatively, you mentioned your process involves resizing the image canvas as a means to 'crop' a given portion of the image out to a JPG? If this is your only performance bottleneck then finding a way to avoid that step should work around the issue entirely. How about trying these steps instead? 1- Create a rectangle selection of the desired export size (e.g. 4800x7200) at the desired location in the image 2- Edit > "Copy Visible" (copies from all rendered layers) 3- Paste as New Image 4- Export -- Stratadrake strata_ran...@hotmail.com -------------------- Numbers may not lie, but neither do they tell the whole truth. ________________________________ From: gimp-user-list <gimp-user-list-boun...@gnome.org> on behalf of BWK <for...@gimpusers.com> Sent: Monday, June 18, 2018 8:27:47 AM To: gimp-user-list@gnome.org Cc: notificati...@gimpusers.com Subject: [Gimp-user] Layer groups seriously broken - huge resource hog Whilst I have played with settings recently to use an SSD partition for swap, this answer still doesn't address why the disk space usage is wasteful. The extra space not being used for anything worthwhile will fill up my disk much faster. >Layers groups are not meant to keep things tidy. They are meant to >force >the compositing order, like parentheses in a mathematical equation. >Groups have their own opacity, blending mode (and layer mask in 2.10). >Layers in a group are composed, resulting in a virtual layer, which is >composed with the layers (or virtual layers from groups) in the parent >level... > >It is possible that layers groups add just enough memory to overflow >the >tile cache and force Gimp to work with a swap (this really slows tings >down). See Edit>Preferences>System resources>Tile cache size and set >it >to as much as possible (your available RAM minus what you need for >your >system and other apps). > >Something that can help keep things tidy in 2.10 is t use color tags >on >the layers. -- BWK (via www.gimpusers.com/forums<http://www.gimpusers.com/forums>) _______________________________________________ gimp-user-list mailing list List address: gimp-user-list@gnome.org List membership: https://mail.gnome.org/mailman/listinfo/gimp-user-list List archives: https://mail.gnome.org/archives/gimp-user-list _______________________________________________ gimp-user-list mailing list List address: gimp-user-list@gnome.org List membership: https://mail.gnome.org/mailman/listinfo/gimp-user-list List archives: https://mail.gnome.org/archives/gimp-user-list
