Select the images to process” section, select pic-folder, and check “Include All sub-folders”. Let’s see what Photoshop can do to that folder. The subfolder 20 represents a subfolder where conversion is not done. The subfolder 10 represents a subfolder where somebody else has already converted the NEF files to JPEG but not discarded the NEF files. The file list of pic-folder: pic-folder\10\A.jpg I made a simplified test folder called pic-folder which has two subfolders and six image files in it. Image files in some subfolders were all JPEG, but some subfolders only had NEF files in them, and then there were subfolders which had both JPEG files and NEF files. The images folder I had to work with had many subfolders. See Getting To Know Photoshop: Image Processor You can access the feature by clicking File > Scripts > Image Processor… menu from Photoshop. So I thought maybe what if I could automate Photoshop? Or what if Photoshop had some kind of API? So I googled around further and found that Photoshop has a built-in batch conversion feature. PIL is a popular image library for Python and it doesn’t support reading NEF files. I thought to write a Python script to do the job and googled around but there seemed to be no module for conversion. My task was to convert all NEF files to JPEG and discard the NEF files to save disk space.
They were large in file size compared to JPEG files. Windows 7’s built-in file browser could not display the images for NEF files, but Photoshop could. The NEF files are a kind of raw image files taken right from some digital camera. I had a folder given to me and this folder had a lot of image files, some were in JPEG format, and some other were in NEF format. Recently I had to batch convert a bunch of raw image files to JPEG.
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