First, it uses a smart algorithm to figure out how much an image can be compressed without visible effects (so the program isn't lossless, but it's not just re-encoding at some fixed quality setting, too). JPEGmini is an interesting app with a two-pronged approach to shrinking JPEGs. But if you just want a single, simple Mac-based tool, which can handle GIFs, JPEGs and PNG files, then ImageOptim looks like a very sensible choice. You can do better elsewhere with individual tools, then. Our GIF web graphics were reduced in size by 16.2 per cent, PNGs by 17.8 per cent, JPGs by 18.3 per cent. The end results were solid, but not spectacular. The program isn't the fastest tool around, but unless you're giving it thousands of HD JPEGs that's probably not going to be a problem. Drag on a single file, a group, a folder or whatever, and it immediately starts compressing each image and displaying the results. As a result it won't cut file sizes by quite as much as some of the competition, but at least you don't have to worry about any loss in image quality. The program is all about lossless compression – removing comments, colour profiles and so on – rather than re-encoding or reducing the number of colours. ImageOptim is a Mac tool that optimises GIF, JPEG and PNG images by acting as a front end for a host of other applications: PNGOUT, AdvPNG, Pngcrush, extended OptiPNG, JpegOptim, jpegrescan, jpegtran, and Gifsicle. JPEG and GIF compression rates were more standard at 17.7 per cent and 15.9 per cent respectively, but there's still a lot to like about FileOptimizer especially if you can also use it to compress other downloads on your site. Of course it's compression that really matters and here is where FileOptimizer delivers some great results.įor instance, the program shrank our PNG test graphics by 42.2 per cent – the best lossless compression performance in this group. The originals are sent to the Recycle Bin so remain recoverable, for a while at least. This simplicity has a down side as your source files are replaced by the program. In fact, the program has one of the most straightforward interfaces here: drag and drop your images onto FileOptimizer, right-click, choose Optimize and that's it. Surprisingly, though, there's no increase in complexity. Not only can it compress JPG, GIF and PNG images, but it can also work with executable files, archives, Microsoft Office documents, PDF files, and the list goes on. There's no doubting FileOptimizer's ambition. FILEminimizer Pictures program is versatile, configurable and easy to use, though, and if that's more your priority then it may be worth trying the program for yourself. Whether this sort of reduction is enough to justify compromising image quality is another matter. PNG compression rates were nothing special at 26.8 per cent (some lossless tools do better) GIF compression was a more average 16.5 per cent but our JPG web graphics dropped in size by 39.3 per cent, the largest fall in this group. How well does it do? That varied depending on format - at least for our tests. And it's fairly quick, so you're not kept in suspense for very long. Once you've pointed it to your source files, chosen an output folder, perhaps configured an option or two, one click is enough to begin optimisation. In use, the program follows the usual format. Although, fortunately, you can adjust most of this in the program's settings. By default it may change formats, resize images, re-encode JPEGs with a reduced quality and strip out metadata in an effort to shrink your pictures. FILEminimizer Pictures (opens in new tab)įILEminimizer Pictures takes a more drastic approach to image compression than most of the competition. Clearly most people will be better off elsewhere. But even then the overall size of our images fell by a very feeble 1.2 per cent. Fortunately, you can tell Caesium not to write a file in that case. It can only output 24-bit files, so if you're using anything else then your images will probably grow in size.Īnd the program's results clearly illustrated the problem, with most of our test PNG web graphics actually increasing in size. There's no lossless option it just reencodes the file at your chosen quality setting.Ĭaesium does provide support lossless PNG compression, although this has a major limitation. Click the Add program, choose your images, select an Output folder, click Compress and you'll have your results within seconds.īMP compression isn't of interest to us, and the program's JPG technology isn't anything special, either. Caesium is a simple open source tool that helps you to compress PNG, JPG and BMP formats.
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