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In that sense, some refer to these masks as self-feathering. There are no sharp transitions like what I have in my screenshots above. When you now brighten the image, the effect of the brightening is greatest on the brightest pixels, and least on the darkest pixels. So the L layer in Pat’s article fully selects completely bright pixels, and only partially selects pixels that are half as bright, and doesn’t select pixels that are not bright at all. What luminosity masks do is let you select regions in your image in proportion to their brightness. We’d really like is a way to select based on the actual contents of the image. You can feather it even more if you wish, but however much you feather it, the transition is determined too heavily by your choice of selection (a rectangle in this case). Feathering simply makes the transition less sharp:īetter, but still too sharp a transition. The quick solution is to blur the mask (feathering in GIMP). First, I strongly suggest you read Pat David’s post and thoroughly understand what’s going on.Ī quick and simplistic explanation follows: Normally, if we make a selection and, say, adjust the brightness dramatically in that selection, we get a sharp (and ugly) transition near the edge of the selection: I thought I’d post a quick tutorial on luminosity masks using parametric masks. Can darktable do something similar? Yes – they’re a special case of parametric masks. I recently read his post on luminosity masks and was fairly impressed. That covers everything you’ll need to know to do batch processing in GIMP! I think you’ll agree that using BIMP for batch processing is much simpler than trying to learn GIMP’s batch-processing scripts! GIMP is arguably the most powerful open-source image editor, but every so often, it reminds us that it still has a ways to go in the user experience department.Pat David has a great blog on photoediting in GIMP.

Once all the settings are configured to your satisfaction, click the Apply button in the bottom right, and GIMP will begin processing your images automatically.

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It’s also important to make sure that you choose your output folder carefully for the same reason: you don’t want to overwrite your original files, especially when you’re first learning how to use BIMP. It’s usually simplest to store a copy of all of the images you want to batch process in a separate folder since this also helps to prevent accidentally overwriting your unedited source files. To use BIMP, open the File menu and click Batch Image Manipulation…

Once the installation is complete, launch GIMP as you normally would, and BIMP will be loaded automatically.

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Make sure you don’t download BIMP from an unofficial source! How to Use BIMP for Batch Processing

macOS will still give you a warning message, but this time you’ll have the option to go ahead and open the file anyways.Īs long as you downloaded the file from the official GitHub page as directed above, there is no need to be concerned that the plugin will contain malware. To get around this, right-click or ctrl+click the “install” file and click Open in the popup menu.

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Your Mac will probably give you a warning message informing you that the program cannot be executed because it comes from an unknown developer. Open the new folder, and double-click the file named “install”. macOS will create a new folder with the same name and place the decompressed files inside the new folder. Once the download is complete, open your Downloads folder and double-click the downloaded file to expand it. If you’re installing BIMP on a Windows PC, all you have to do is run the installer program and follow the on-screen prompts. Installing BIMPĭownload the appropriate version for your operating system from the official website.

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BIMP is the brainchild of Italian computer scientist Alessandro Francesconi, and he gives away the plugin for free on his website. The most popular batch-processing plugin for GIMP is named BIMP, which stands for Batch Image Manipulation Plugin.

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Because GIMP is open source, anyone with software development experience can create plugins. One of the greatest features of GIMP is the ability to add new features by installing plugins that have been developed by the user community.Īs you might guess from the name, a plugin is a small piece of software that integrates with a larger program such as GIMP. Method 2: Make Batch Processing Easy With a Plugin Those of you who are comfortable with scripting can use the Script-Fu console along with the Procedure Browser to run any commands you want, but the rest of us will be using the BIMP method described in the next section.