Digital BW, The Print

Andre,

Suppose you have a 10,000 x 10,000 pixel original (about 100 MB 
Grayscale).  If you "res down" (resample) to 2000 x 2000 you will have 
about a 4 MB file.  Then do the layer work, then go into Image Size and 
resample the file back up to 10,000 x 10,000.  That would be "res'ing 
up."  In reality you would never want to use an image that was res'ed 
up, since you would only be enlarging the pixels, not adding true 
resolution or detail.  But it acts to resize the adjustment layers and 
any masking you have done.  Otherwise they will be too small and only 
affect a 2000 x 2000 area of your larger image. You actually can throw 
the smaller sized image file away after getting the layer set back out 
of it and into the original.

BTW, this works in reverse.  Say you are working on a large file, and 
have already added some adjustment layers, and you find that after 5 or 
6 the file size has grown significantly and everything is slowing down.  
Copy the raw image, usually its in the background layer unless you've 
moved it up, to a new file.  Keep it the same size pixelwise for now.  
Then link all the adjustment layers in the first file and create a new 
layer set containing them.  Drag this into the newly created image file 
holding down the shift key to center it up.  Then resample that file 
down to a smaller size.  All the layers will shrink with the image, and 
you should be able to continue your manipulations much more quickly.  
When done, res back up to the precise pixel dimensions of the original, 
then make a new layer set containing all original and any added 
adjustment layers.  Before you take them back to the original hi-res 
file, you must delete or at least turn off all adjustment layers there, 
or duplication will result.  Then drag the new set in and you're back 
in business...

Hope this helps,
Phil
http://philbard.com


> 
> > background, and res *back up* (yes, you heard correctly) to the exact 
> > same pixel size of the original.  
> 
> What you mean by "res back up" ?