Cache Dilemma

SG
Posted By
Scottie_G.
Jul 5, 2004
Views
356
Replies
10
Status
Closed
In file browser, I just brought up a folder of images and all the rotations I made are missing. I checked the folder and the cache files are there. So I don’t get it.

I went to a copy I have of this folder and brought it up in FB and it displays fine. So I copied the backup to my primary folder (deleted old one) and it still does not look right in FB!

So I’m completely lost.

Also, wondering, sometimes the cache file are at the top of the folder list (which I like), and sometimes at bottom. why? any control over that?

Also, curious about the rules for purging cache. Cache is so crazy to me, don’t want to do anything like that till I’m 100% familiar with it. Is it possible PS one day wont need a cache and will just retain your changes automatically? I find cache insanely annoying.

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GA
George_Austin
Jul 5, 2004
Scottie,

See Ian Lyons’ explanations in his several responses to my June 6 post "Purging Cache".

You might try purging the cache for the folder in question. That will get rid of the folder’s dynamic cache and PS will then look for its static cache—the one you find in the folder itself.

The static cache can only have gotten there by your exporting of the dynamic cache. If you exported it while the dynamic cache still had your rotations, they’ll be in the static cache. If the rotations are not in the static cache, you must have exported to it before creating the rotations.

Since the rotations are not in the dynamic cache, you must have moved or renamed the folder after creating the rotations and failed to export afterwards. The dynamic cache gets rebuilt after such a move when the folder is selected, but the rebuild should make use of data in the folder’s static cache. That implies that the static cache is lacking the rotation data.

Yes, this browser cache thing is a doozy!

George
SG
Scottie_G.
Jul 6, 2004
Thanks George:
I read the old thread, and I’ve got a handful of questions. But I want to first focus on this one problem first and then I’ll ask them, and hopefully someone can help.

I have a folder called JOE on hardrive #1 with 100 Raws and sidecars.

None of the exposure updates are there (they look dark)

The rotations are not there either.

Now luckily, this folder called Joe, was saved on hardrive #2.

and in FB, when I navigate to Joe in hardrive #2, everything comes up they way that Joe used to come up in hardrive #1. The Raw updates are present immediately (exposure are bright and corrected) and rotations are correct and there.

So you know what I did? Take a guess! I deleted the the joe folder from hardrive #1, went to hardrive #2, and copied joe from hardrive #2 to hardrive #1.

Unfortunately, when in FB , when I navigate to the freshly minted joe in hardrive #1, is still comes out bad — no updates, no rotations.

So I redid the process, and this time in HD #2, clicked export cache first, and did the same thing. Still no difference, still coming up bad in HD #1. So I am still totally at a loss.

By the way, the updates, thankfully to come back into play, after about a five minute wait.

Then I decided to take your advice, and purge the cache. This went against my common sense and reasoning since a warning came up saying all previous……will be deleted. Normally I would not do that, but I had nothing to lose. And it worked.

And even after reading that whole thread I have no idea why, so now I’ll ask:

1) you have images in a folder. You are doing your thing in FB, being that you at some point may want to burn these to cd or move to another HD, my feeling would be it’s always a good idea to select export cache every time you do new rotations correct?

2) any idea why that folder lost it’s rotations in first place, still did not understand it. I have four other folders similar and they did not lose anything.

3) If folders have been moved to other hardrives, similar to copying to cd’s?

4) I did not select purge entire cache, that would be crazy right? You would lose cache for all work you have done on all folders on your HD, no?

5) You purge a cache, then it gets rebuilt. why was I thinking that purging is deleting. I guess purging is not deleting the cache. maybe the term should be refresh the cache.

6) Don’t understand subfolders. I use sub folders in my e mail program, not in photoshop. I have a folder called X with images in it. If I want a new folder, I make a new one and call it Y and put images in that one that relate to Y. Don’t get the subfolder thing.

7) still don’t get the dynamic/static thing. maybe cause I never use subfolders (is that it?) i’ve only seen the p8m,p8p and p8t in my folders, and that I assume comes after you do an export cache. the m,p,t etc, never seen those.

8) just read bit in one of the PS7 books and author said hopefully all this would be automatic in PS8. I have CS, what’s going with Adobe? Is this all some kind of Halloween trick they forgot to undo? Make me miss iview which has none of these problems but does not do a good job for me with RAW.
SG
Scottie_G.
Jul 6, 2004
What is the smiley face before my last paragraph. I didn’t put it there! Curious.
GA
George_Austin
Jul 6, 2004
Scottie

The so-called dynamic cache is a collection of several files for each folder or subfolder stored in one other folder. That is, ONE folder contains cache data for ALL folders. That one folder and its path is:

C:\Documents and Settings\[personal—like,say,Scottie]\ApplicationData\Adobe \FileBrowser\PhotoshopCS

The data that goes into this folder gets there automatically as you generate it without you consciously directing it, and those files are identified with the image folder. If you move or rename the image folder, the connectivity is lost. A new cache relating to the new image folder name or location is regenerated when the new folder is selected, but starting from scratch—except it will be based on any data in the STATIC cache within the image folder itself.

Whether a static cache even exists in the image folder depends on you. You must have put it there, and the only way you could have done so is by exporting the dynamic cache as it existed at some prior time. The static cache consists of the 3 files Adobe P8M, Adobe P8P, and Adobe P8T containing metadata,preview data, and thumbnail data. Those files remain in the image folder and are not updated unless you do a subsequent export. The static cache is not used by PS unless it can’t find a dynamic cache, and when the dynamic cache is regenerated, the static cache data is copied into the new dynamic cache.

That’s my take on how the browser caching works, based on what Ian Lyons described in the thread I referenced. I may well have lost something in the translation.

PS: The smiley face is an "emoticon" you generate by typing a particular combination of keys. For example, typing a semicolon + hyphen + right parenthesis gives this: 🙂

George
LM
Lynch_Mike
Jul 6, 2004
SG
Scottie_G.
Jul 7, 2004
Thanks George:
it’s starting to become a little bit clearer, apprecite it. Maybe someone like Ian could put out a pdf of this. I would buy it.
SG
Scottie_G.
Jul 13, 2004
George:
The problem seems to come back. I do purge cache, everything is fine. But minute I close out of that folder and then reopen it in FB, goes back to same problem.

Have to re-purge cache etc. Is way to get this to stick? thanks
GA
George_Austin
Jul 15, 2004
Scottie,

"…The problem seems to come back. I do purge cache, everything is fine. But minute I close out of that folder and then reopen it in FB, goes back to same problem…"

You say the problem comes back. I assume you mean that you lose the rotation data you laboriously created. You say you purged the cache. You didn’t say you EXPORTED the cache BEFORE purging. Is that the problem or am I misreading you?

George
SG
Scottie_G.
Jul 15, 2004
George:
Basically to make a long story short.

You helped me solve this problem. I selected purge cache, and all the rotations and correct expures came back.

What I noticed though is that after I left the folder and came back they were gone. But if I did another purge cache, then they would be repaired and look good again (ie ROATIONS ARE BACK, EXPOSURE LOOK GOOD ETC)

And this cycle would repeat again and again. I leave the folder, and come back, look bad, I do the purge cache and then it looks good. and this repeats again and again.

Now, I just took your advice and this time before selecting purge chace, I selected export cache, and then selected purge cache.

New result: now folder of images wont fix at all now (ie GO BACK TO CORRECT ROTATIONS AND EXPOSURE, even with the purge cache selected. So basically, I am now back to where I started. I have a folder, rotations and been selected, three annoying files (adobe p8m) etc are still in the folder, but now even purge cache now wont work to make rotations etc come back.
GA
George_Austin
Jul 16, 2004
Scottie,

There has to be a way to get the info exported from the dynamic cache into the static cache back into the dynamic cache after the dynamic cache has been purged because, as I understand it, PS only uses the dynamic cache.

A corollary conclusion is that there is no point in immediately purging the dynamic cache after exporting it, because it will be restored to whatever was last exported. Once restored, it no longer seeks out what is in the static cache and, if rebuilt to some other configuration you want to save, you would at that time re-export to the static cache.

I would have thought the dynamic reconfiguration to the static content after a dynamic purge happens automatically when the dynamic cache is regenerated. If that’s not happening, it’s back to the drawing board for me. This takes more experimentation than I currently have time for, but I am putting it on my "to do" list :-)! In the meantime, if you come up with some clarification, please pass it along.

George

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