Photoshop :: Creating Histograms - Secret Behind Cache Level
Apr 21, 2013
Photoshop creates several preview images (more smaller than the original) for displaying the effects and creating histograms. So, I think that if I choose the cache level as 1 in the preference window, Photoshop does not create any smaller preview and it always displays information according to the original file.
But, this is not the case, as far as I can see. I set my cache level to 1 and it still displays histogram for cache level 3. So, my question is ... what is the secret behind the cache level?
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Apr 27, 2004
I just want to know the secret to the gamut warning. I am in a Photoshop class and we are currently doing color correction. My color corrected image looks good, but my image still has a gamut warning. I know that every image is different, but what are some of the basic things ya'll do to get rid of the gamut warning? Is there any type of conversion that you can do that'll get rid of it?
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Jul 11, 2013
We have 8 designers all running identicle systems, but one user is constantly using up their disk space quota, I've traced the problem to the fact that when they use illustrator it writes loads of 16.8 Mb files to their Library > Cache folder all called .afpdeleted followed by a series of numbers.
This doesn't happen with any of the other users.
He is using:
Mac Pro 2.66Ghz 12Gb RAM
OS X 10.7.5 ( this is as far as this mac can be updated)
Network Home Login
It is happening on illustrator CS6 and also on illustrator CC. What is happening and why it is only happening to this one user?
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Mar 30, 2004
Why is the histogram displayed in the Levels dialog box different (sometimes radically different) than the one in Image>Histogram?
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Apr 28, 2011
I have a little project in mind (I don't really want to say what it is) that requires very neat linework. I have to say that in terms of linework I am superb with straights. I can even do parallel straights!
What I really need though are smooth 90 degree bends and not just for one line, multiple parallel lines.
What is the secret of getting perfect, precise bends? I can do bends but I fiddle for ages to get them to look right. What really interests me is to take a series of parallel lines and bend them as one.
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Nov 14, 2012
I am using Gimp 2.8.0 but only understand about 5% or less of it. (It is running on Win.7 Hm. Prm., Vsn 6.1, Sp-1.)
How can I define or adjust the pencil tool so it draws at the one pixel size in a new ".gif" work area. (That would be one pixel in the image to one pixel on the screen.) I found how to define the work area in pixels for a ".gif". The predefined pencil tool sizes (chosen by assorted dots) "went away" several versions of Gimp back as far as I know.
The object of this effort is to produce "TrainGifs" for use in other applications. Should you be interested just Google "TrainGifs" and you will be able to check out multiple site for this hobby.
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Aug 6, 2013
I am on OSX using Photoshop CS6.
For a couple months now I have experienced the "Building Histograms" dialog appearing on nearly every move or action; moving an object, adjusting a shape, zooming in & out, simply selecting an object.
The building of the histograms almost always takes up to 10+ seconds to complete.
I have followed other topics where there was no solid professional answer to the problem. The closest thing everyone was able to pin it on was the use of an extension or add-on. I have none of these.
In my opinion an update / fix should be applied for this. I won't be interested in further debugging or providing information. Simply stating that I am experiencing this for history sake.
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Oct 11, 2008
In the histogram palette menu there are red, green and blue histograms to give the saturation of those colors, and a luminosity histogram to give the overall ( greyscale) brightness. There is also an RGB option, presumably to give a composite version of the red, green and blue saturation. In Levels, however we have the same thing, except there is no luminosity option, only RGB. But RGB in this case cannot be a composite of the three color channels, as we use it to adjust brightness and contrast; in other words it is presumably the same as Luminosity in the histogram palette. Despite this, when I do adjustments to an image the RGB histogram in Levels looks identical to the RGB histogram in the histogram palette. I'm using PS 3 Extended.
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Oct 11, 2008
In the histogram palette menu there are red, green and blue histograms to give the saturation of those colors, and a luminosity histogram to give the overall ( greyscale) brightness. There is also an RGB option, presumably to give a composite version of the red, green and blue saturation.
In Levels, however we have the same thing, except there is no luminosity option, only RGB. But RGB in this case cannot be a composite of the three color channels, as we use it to adjust brightness and contrast; in other words it is presumably the same as Luminosity in the histogram palette. Despite this, when I do adjustments to an image the RGB histogram in Levels looks identical to the RGB histogram in the histogram palette. I'm using PS 3 Extended.
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Sep 22, 2010
I am working in Photoshop CS5 on a MacPro with Snow Leopard, 10.6.4. I have a file that is a little over a gigabyte open. Every time I make any changes to the file (i.e. select a different layers, grab the text tool, etc.) a menu pops up with a progress bar and says it is building the histgrams.
This process happens with EVERY move. As you can imagine, this has slowed my productivity down to a crawl. Can I do anything to make it stop rebuilding the histograms at every step?
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Nov 29, 2013
The histograms on the library panel and on the develop panel are not same for most of the images, there is a tiny difference between them. What is the reason for this difference?
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May 7, 2013
I am trying to adjust the noise level with the level tool but its not working. I move the arrows every which way see that it changes. I get it to were i want it them press ok and it only changes a little bit.
It become what it was in the preview. The level tool works when I add it as a new adjustment layer but I don't want like that I want to be able to copy the new level of noise I just made and can't if I add new adjustment. what should I do to fix this? O and this is the trial version and It wasn't working earlier with lots of other tool but i uninstalled it and now they are working except the level tool how I want it to.
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Mar 3, 2014
Here's the text:
1. Should Media Cache Files and Media Cache Database be in separate folders? Does it matter?
2. Can I open an "in progress' project from P Pro CS4 with CC P Pro and continue editing?
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Jul 16, 2007
I am having a little trouble with some doors showing up on the level 1 door schedule that are actually on level 2. They are curtain wall doors.
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Jun 18, 2013
The underlay does not show up for Level 1 when I am on Level 2, but it does show up for Level 2 when I am on Level 1. the underlay option is on for Level 1, so I'm not sure why it's not showing up. I am using Revit 2014.
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Oct 29, 2012
Say I have an image where I'm attempting to extract a mask from and I've found that one of the channels will serve as a good starting point. Further suppose that I have found that I want to increase the luminance level of pixels in the range of 60 - 65 by 10 luminance levels each:
i.e. all pixels with luminance values of 60,61,62,63,64,65 would, after the operation have luminance values of 70,71,72,73,74,75. Is such a thing possible with Photoshop?
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Aug 17, 2013
I'm not doing video ( I dound that in the drop down menu.) I want to empty the photoshop cache.
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Apr 23, 2013
I get this error message when I open Bridge CS6, a problem has arisen. Can not read cache. Try empty cache buffer settings to correct the problem. I have tried this several times but the message will not disappear.
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Jan 12, 2008
I seem to have to be waiting for folders of images to chace their thumbnails that have already gone through the process.
IN other words, they probably have already gone through the 5, 10 97 % thing you wait for and all thumbnails are done
CS3
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Oct 29, 2012
When printing I unchecked center image in PScs5 and reduced the size of my image, using the achor in the preview window, to run a test print. I'm printing to an Epson 3880. Once I ran the test print, I returned to PS and my original image. Selected print and only the preview of the test print is there. The orginal sized image will not load in the preview window. I have deleted the PS preferences and restarted twice. Even after moving to another machine, the profile seems to be embedded in my image. The same preview image is on the three machines I moved to.
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Nov 10, 2012
work with an Imac, version Moutain Lion 10.8.2 and with PS6.I get this message when opening PS6 Bridge, see upper section of the annex. If I click Ok pressure I can continue working.Don't know what good that cache content and for which this actually serves. have already emptied via preferences cache cache, this problem is not yet solved.
Translate the error message
"There was an error in Bridge causing the cache cannot be read. Try to clear the cache in the Central cache preferences to resolve the situation."
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Nov 20, 2012
I'm trying to figure out how many/how big drives/SSD or hard drives I need to get for a quad-core Mac Pro, and am stuck when it comes to the scratch disk.
1) How do I determine how big a scratch disk needs to be in Photoshop CS4 extended (Mac)? I've come across a few sites which explain how to calculate this but they're very technical and hard to grasp IMHO.
2) Where do SSDs come into the equation? Obviously they're still too expensive and small for file storage, but will a SATA-3 SSD (connected to a SATA-3 PCIe card if the onboard SATA-3 interface will be a bottleneck) do wonders as a scratch disk? I've read opinions that go both ways on this. Or are they mostly for use as a system and applications boot drive? And does it make much of a (real world) difference to use a SATA-3 SSD/PCIe interface or just stick with the SATA-II interface already available?
3) Apart from Photoshop, do other applications use a scratch disk as well (Lightroom for instance, which I also use)? It seems a waste to dedicate a hard drive or SSD just for Photoshop alone.
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May 29, 2012
Since installing CS6, I keep getting a pop-up message whenever I first start to open up Bridge. The message says: "Bridge encountered a problem and is unable to read the cache. Please try purging the central cache in Cache Preferences to correct the situation." I have cleared the cache, but the message keeps appearing.
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Jul 29, 2009
I am putting together a pc ideally for using Photoshop, I was wondering in terms of buying a hard drive if I should get one with a higher rpm rate or higher cache? Which does Photoshop rely more on?
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Apr 17, 2009
Wondering if there is any guidance on retention of .dat files in the folder called UserLocal SettingsApplication DataCameraRawCache. I have close to 1 GB of .dat files in that folder, and am looking for ways to keep down the storage in my O/S (boot) partition.
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Feb 23, 2012
Bridge (CS5) unable to read cache.
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Mar 4, 2012
I'm using PSCS5.1 and when I open Bridge I get the message "Bridge encountered a problem and is unable to read the cache. Please try purging the Central Cache Preferences to correct the situation." where "Central Cache Preferences" are located? I found in Bridge under Tools the "Cache" but It does not say anything about Central Cache Preferences.
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Dec 3, 2012
Using my MAC version 10.5.8, and when searching for images in Bridge, whether it is among 3 external hard drives or just one, the search has many long delays, somtimes I think it is my mouse, then I see the images taking a long time to scroll and long time for thumbnails to appear. My mouse seems to jump around, but I think it is a delay. Do I need to purge cache?
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May 20, 2013
my cache memory is full of pictures, the eldest is from 2007. How can I empty the cache memory without risk?
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Jun 24, 2009
I've upgraded from CS to CS4 and find what I think are local cache files in photo directories from both versions. It appears CS wrote AdobeP8M.md0, AdobeP8P.tb0 and AdobeP8T.tb0, while CS4 writes .BridgeCache and .BridgeCacheT. Can I delete the many GB's of Adobe P8* files with no ill effects? I no longer use and have uninstalled CS.
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Feb 28, 2008
For some unknown reason...CS2 has started placing "Adobe Bridge Cache" file shortcuts on my desktop. When I click on one, I receive a Win XP error message that says the file .bc is unkown and can't be opened.
These shortcuts have never appeared before. Now the simple act of opening Bridge and looking at jpeg files seems to initiate it.
Questions: Why is PS doing this? Do I need to pay attention to it? If not, how do I stop PS from cluttering up my desktop.
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