Hi Paul,
William Curwen has answered you, but not very specifically.
Once the session is over, that is when you close the file, History is
gone forever. However, as William points out you can take Snapshots at
critical points within your session that can be volatile (ie remain
within the History Palette only for that session) or non-volatile by
saving a copy with the default name as the History State at which the
Snapshot was taken. It can be of the merged layers, a flattened file or
complete with all layers/layer masks etc. This will be external from
the current file and will start with just one entry within its History.
History is a collection of saved tiles with only the changes held from
the previous History State, this means that if only non-global changes
are made, History can provide a very useful and efficient Review tool.
If you do not make good use of the Adjustment Layers and associated
masks and instead make immediate global tonal changes upon the pixel
information this will make great demands on your RAM and Virtual Memory
and make History extremely unwieldy as William states, though most
people would not get to the sizes he states unless the original files
were extremely large in the first place.
So as I imagine the file has been closed, we can offer no easy remedy.
Rod
Rod Wynne-Powell
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