Many programs, including Image Capture and Photoshop, will create a custom icon that is an actual part of the file, when the file is processed and saved by the program. When the file is selected the preview column will display a large thumbnail, which is drawn by Finder based on the data in the file. When you have one of these in column view the file that is in the list of files will display the generic icon for a file that "belongs" to whatever application is set to open that kind of file. The Finder can draw thumbnails for graphic files that do not have one as part of the file. I know that it all gets a bit confusing, but I'll take a shot at explaining it. Then there's something wrong with your files or your image editing app doesn't save custom icons. You should get similar results by default. Changing the preferred application for an file doesn't remove custom icon (at least for image files). If a file doesn't have one a generic icon is used. The column view doesn't use this method but only looks for pre-saved custom icons. Finder itself has capabilities creating (and slowing down the system) custom icons for images on the fly while scanning folders. Where exactly do you get the preview icon from toĬustom icons are saved by some applications. Unless you edit them all manually, and if you do, Retaining an icon included inside Photoshops package. Jpegs all opening with Preview and have them The way OS X deals with file icons, you can't have In the end this doesn't affect how column view works. pdf files instead of Photoshop or Acrobat. OS X tends to offer Preview for many image formats as well for. It's a user preference, you may set file associations how you want. Then use Get Info to set that file to open with Preview instead of Photoshop. Yes, they will open with Preview.app but that doesn't tell what application saved files. 'Preview' as you can see here, screenshot from the
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