To organize your images the PRO-version adds the following functions not found in ACDSee: compare up to 4 images next to each other on 1 screen, tag pictures as a pick and rate your photos from one to 5. All these functions are aimed at selecting photos from big photo shoots, and they work well.
The most important pro-only feature is the possibility to process RAW image files in a non-destructive way. A RAW image file contains minimal processed data directly taken from the image sensor in a digital camera and serves the same purpose as a film negative in traditional photography. These files cannot directly be used for display in most software, but need to be processed first. Non-destructive editing means that the changes you make to the photo, like color correcting or contrast, are not directly applied to the information in the file. This information is stored in a separate file leaving the original data unaltered. When you are completely satisfied with your image you export it to a new file and use that file for further editing or printing. This non-destructive mode only works for raw images, if you edit a photo in any other format the image itself will be changed although the program gives you the option to save the original for later retrieval.
Working with ACDSee Pro reminds me of working with Adobe’s Lightroom, which however, has more options, a better workflow and produces a slightly better image quality. Even so, it also costs quite a bit more and the results you get from ACDSee Pro are good. more
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