The edits for your 20,000 photos are in the catalog, so you need to point LrC to the new location of the files. If you create a new catalog and import the photos, you will have to edit them again. The only fix for this is to reconnect the photos with your current catalog. https://www.lightroomqueen.com/lightroom-photos-missing-fix/   Is your F drive an external drive? If so, before doing anything, assign it a drive letter towards the end of the alphabet, like X or Z. This will prevent the drive letter from changing in the future. Let's say that your F drive is not connected, and you connect a different drive. Windows will assign it the first available letter in the alphabet. If this letter is F, and you then connect the drive with the Photos, it will be assigned G, and Lrc will report all your photos as missing.   To change the drive letter, open the File explorer, right click This PC, then choose Manage. Click Disk Management on the left. Right click the F drive, and choose Change drive letter and paths. Click Change in the dialog that appears, choose the new drive letter and click OK.     ... View more

The current version of the DNG converter will not be able to convert raw files from these unsupported cameras. When support for these cameras is added in Camera Raw and Lightroom through an update, the DNG converter will also receive an update. ... View more

I found a sample raw file from the 20D on the Internet, and the only place the camera model is listed is after the file name at the top of the Camera Raw window. Did you check Use profile corrections in the Optics panel? I had to manually choose Canon in the Make field, then the profile appeared. If this doesn't work for you, please post the DNG file. You should be able to attach it to a new post.   ... View more

You have the latest GPU driver, but if you are using the Game ready driver, download and install the Studio driver instead. The Studio driver is more thoroughly tested than the Game ready driver, and is better suited for working in LrC. Laptop: https://www.nvidia.com/fr-fr/drivers/details/242265/ Desktop: https://www.nvidia.com/fr-fr/drivers/details/242233/   I also notice that you have the catalog on OneDrive, which is known to create problems. Move the folder to somewhere outside OneDrive, preferably to the root of the drive, like C:\Lightroom Catalog. Then double-click the catalog file (which has the extension .lrcat) to launch LrC from the new location. ... View more

If you have been using other zoom values than 100% or Fit view, it is difficult to drag the slider to 100%. Double-click the slider to zoom to exactly 100%.     See this thread for various ways to adjust the sliders for editing. https://community.adobe.com/t5/lightroom-classic-discussions/sliders-in-lightroom/m-p/15023222#M389269 ... View more

Is the catalog folder inside a folder that syncs to the cloud, like Dropbox or OneDrive? ... View more

Lightroom 4 did not use activation. If you entered your serial number, and it installed successfully, it should work indefinitely, or at least until a change in your operating system causes it to stop working.   Adobe has provided a script you can use to extract previews from the Previews.lrdata folder. https://helpx.adobe.com/lightroom-classic/kb/extract-previews-for-lost-images-lightroom.html ... View more

The system info you posted is very limited. Please go to Help > System info in Lightroom Classic. Click the Copy button, then paste in a new reply. ... View more

One more thing about jpg file size – The file size you see in Lightroom is most likely the uncompressed file size. The file size you see in the Mac Finder or Windows file explorer is the size on disk (compressed). The two files I posted previously are both 394 kb uncompressed. And the  uncompressed file size of the 3034 x 4535 pixel image in your screenshot is 39.4 MB. ... View more

I Just can't understand why Photoshop can do all the edits without any problems but Lightroom-which Adobe are pushing as 'The' main editing AP-can't do them?-Spot removal is one of the most imports tools in any photo editing suite, seems strange that out of three aps-that can all do exactly the same things-they have different ways of doing them, saving them, importing them and the way they process them.  By @Level42   Photoshop does pixel editing. Edits are baked into the file, and when you have closed the file, there is no way to go back to the original image. This is known as destructive editing – it changes pixels permanently.   Lightroom and Lightroom Classic (and the Camera Raw plugin for Photoshop) do parametric editing – all edits are saved as text, and are applied to a new image when you export or print. (all the work you do in Lightroom is done on previews, not the original image) This is known as non-destructive editing. No pixels are changed, and the original remains the same. One click with the Remove tool can generate 25 kb of text or more. So the more retouching you do, the more text Lightroom has to handle to display the preview, and this process is extremely resource intensive.   Another problem I've found is I import an 11MB scan to Lightroom, I edit it and import it to desktop and its now 7.7MB. By the time I finish the edits in Lightroom its going to be about 5MB. Is there a way of saving them without losing so many MBs? I Have the export set to as Large as possible.   The file size of a jpg depends on three factors – Pixel dimensions Quality setting when exporting Image content Assuming that pixel dimensions and quality setting are constant, image content can have a huge influence on file size. The jpg format uses lossy (destructive) compression in order to reduce the file size. Images with predominantly flat, smooth, or out of focus areas are easy to compress, and will have a relatively small file size. Images with lots of sharp, busy detail or noise are harder to compress, and will have a relatively large file size. So file size is not an indication of the quality of a jpg. See examples below.   When you export a jpg from a jpg, the file size is almost guaranteed to change. The quality setting used when creating the original may not be the same as you use when exporting, and even if it is, the file size will probably be different. Also bear in mind that the exported file is a new file, it is not the same file as the original. The edits you have done will also affect the file size. Sharpening will contribute to a larger file size, noise reduction will contribute to a smaller file size. But that doesn't necessarily mean that the file will be larger or smaller than the original. There are several factors at play here.   To assess the quality of any image, view it at 100%. At this magnification, one image pixel is represented by one screen pixel. This is the only magnification that presents you with a true representation of the image. 100% is a reference point. With some experience, you will learn how a good quality image should look at 100%.   450 x 299 pixels, 85 quality, 40 kb   450 x 299 pixels, 85 quality, 141 kb ... View more

Open the CC desktop app, under Installed apps click the three dots next to Photoshop. Click Uninstall, and choose to keep preferences in the dialog that follows. Reinstalling is also done from the desktop app.   ... View more

Since you're using Lightroom, not Lightroom Classic, a moderator will move this thread to the Lightroom ecosystem forum. I don't use Lightroom, but it also uses parametric editing, and even 50 spots could slow your computer down. The only suggestion I have is to use a pixel editor to remove the spots. It doesn't have to be Photoshop, but it will probably give you the best results. ... View more

OneDrive is out of the question, it doesn't work well with LrC. It is possible with Dropbox if you take extreme care, and follow some rules strictly. Failure to follow these rules will lead to issues, and there's a high risk of catalog corruption. I use Dropbox myself with two desktop computers in different locations, and I am the only user. I get the impression that you are the only user of these laptops – if there are several users, I would not recommend using Dropbox – the probability of something going wrong will be too high. If you want to try this, I recommend starting with a test catalog with some unimportant images.   Here are the rules: In Dropbox Preferences > Sync, Save hard drive space automatically must be turned off. In Dropbox Preferences > Sync, Default sync state for new files must be set to Available Offline. The path to Dropbox must be the same on all computers, which also means that the drive letter must be the same. I use D:\Dropbox. If you have different drive letters, your photos will be missing, and you'll have to reconnect them. This will be easier if all the folders are inside a parent folder, and you will then only need to reconnect the parent folder. Before launching LrC on any of the computers, Dropbox must have finished syncing. Since version 14 it has also become necessary to pause syncing before launching LrC, it can be turned back on as soon as LrC is up and running. (failing to pause syncing can lead to the error message An error prevented Lightroom Classic from opening this catalog.) When you have finished an editing session on one computer, close LrC, and wait for Dropbox to finish syncing before you turn the computer off, or use LrC on a different computer. Never leave a computer running with LrC open while working in LrC on a different computer.   This works for me currently, but changes to Dropbox or LrC in the future could cause it to stop working. Keep an eye on the Dropbox sync settings, I have seen at least once that they have changed, probably after an update of the Dropbox application. And make sure to make frequent catalog backups. ... View more

This is a known issue when running Lr 6 on an unsupported Mac OS. What you're seeing is the Info overlay that normally has a transparent background. Press the I key on your keyboard once or twice to hide it. Alternatively press Cmd + I, or go to View > Loupe Info > Show info overlay.   ... View more

Are you saying that you get the same color difference when you set the monitor profile to sRGB? If LrC was running when you did this, did you relaunch it? Applications pick up the the monitor profile from the OS on launch.   If enabling HDR in Library fixes the issue, something is wrong. Please go to Help > System info, click the Copy button and paste in a new reply.   Screenshots are not color managed and do not have an embedded profile. To create screenshots with  a correct representation of what you see on screen, open them in Photoshop, assign the monitor profile (Edit > Assign profile), then convert to sRGB (Edit > Convert to profile) and save. ... View more

Are you not able to open the image in Camera Raw? Where are you not seeing the camera as listed?   Below is a screenshot of an image converted to DNG in 2008, open in Camera Raw. The image opens fine, but it uses Process version 1, so edits are limited to what was possible in 2008. Updating the process version to version 6 will enable all editing, including masking. You do this in the Calibration panel. There is no need to convert the image to the latest DNG version.   ... View more

If it's not the GPU driver, it is most likely a defective or incompatible monitor profile. As troubleshooting, and as a possible temporary fix, try setting the monitor profile to sRGB. If you have a wide gamut monitor, use Adobe RGB.   With LrC closed, press the Windows key + R, type colorcpl in the box and press Enter. Add the sRGB (or Adobe RGB) profile, then set it as default. If this fixes the issue, you should calibrate your monitor with a hardware calibrator. This will also create and install a custom monitor profile that will be more accurate than sRGB or Adobe RGB.   ... View more

I don't do gaming, so I don't know how the Studio driver will perform with games. You'll just have to try it. A Google search for "studio driver for gaming" indicates that there might not be much difference. ... View more

If you have an Nvidia GPU, make sure to install the Studio driver (if available), not the Game ready driver. ... View more

In Preferences > General, make sure that Show import dialog when a memory card is detected is unchecked. Also make sure that Windows Autoplay is turned off.   ... View more

Which version of Lightroom did you buy many years ago? Is it still installed? Windows (at least version 10) can usually run quite old software. If it doesn't launch, it's probably not caused by incompatibility with Windows. What exactly happens when you try to launch it? Any error messages? ... View more

I agree that the official information about the different plans is confusing, and sometimes misleading. According to this page – https://www.adobe.com/creativecloud/photography/compare-plans.html both the Photography plan and the Lightroom plan include Lightroom Classic. The Lightroom plan does not include Photoshop, the Photography plan does include it. ... View more

I have two Windows computers – one bought in 2018 with an i7 processor and a Quadro P2000 GPU (5 GB RAM) – and one bought in 2024 with an i9 processor and an RTX 3060 GPU (12 GB RAM). The old computer can run the current version of LrC without issues, but it's slow compared to the new computer. The slowness is most noticeable when using features than run entirely in the GPU, like Denoise, which runs several times faster on the new computer. So getting a new GPU (for instance RTX 3060 or 3080) would probably make a big difference. My guess is that upgrading the GPU would have a much bigger effect on performance than upgrading the CPU. ... View more

Indeed it is, and in the Camera Raw plugin, which is an integrated part of Lightroom and Lightroom Classic. For rendered files in PS one can use the Camera Raw filter on a smart object layer. It is also possible to open jpg and tiff files in the Camera Raw plugin. Unlike Camera Raw, Lightroom Classic has a history panel that lists every edit, and all the history steps are always visible. ... View more

Please go to Help > System info in LrC, click the Copy button and paste in a reply here. ... View more

Not quite what you're asking for, but there is the History log feature. See https://helpx.adobe.com/photoshop/using/undo-history.html Scroll down to Set Edit History Log options.   ... View more

I suspect that this is caused by a corrupted preview cache, which holds the Library previews. This would not affect the Develop module, which uses its own, separate previews.   The fix is to delete the preview cache. With LrC closed, use the Finder and go to the folder that contains your catalog. if you don't know where it is, go to Lightroom menu > Catalog settings > General tab. Click the Show button in the top right corner to open a Finder window.   Delete the folder (may display as a package) whose name ends with Previews.lrdata. Do not delete anyhing else. Then launch LrC. The previews will be recreated as you browse folders in Library.   You can also recreate all the previews in one operation, this will take some time, and is probably best done overnight. Click on All Photographs in the Catalog panel, select all (Cmd+A), then go to Library menu > Previews > Build Standard sized previews.   ... View more

The image displays correctly in Photoshop 26.4.1, and reports the embedded profile to be Adobe RGB. It also looks fine in Lightroom Classic 14.2. After updating to PS 26.5, the image displays as you describe, and the embedded profile is now reported as uRGB, which apparently is a variant of sRGB created by Meta. Converting to sRGB or Adobe RGB does not fix it. I have no idea what's going on here. @CMass Can you pass this on to the Photoshop team please?   ... View more