![]() Given that JPEGmini can run through thousands of images at a time, this extra step in your workflow is not excessive. But the takeaway here is that for best performance you use JPEGmini on files that have already been compressed by Photoshop. Using the larger one of the first pair above, I compressed that down to 230 kb in one jump, which is an improvement on what Photoshop can do alone. Just for interest, you can run JPEGmini on jpegs that haven’t been through Photoshop’s Save for Web export function. But what’s also clear is that you can then re-compress an image using JPEGmini for further file size reductions with no apparent loss of visible quality. RIGHT IMAGE = Photoshop 72dpi Save for Web PLUS JPEGmini re-compression = 199 kb (plus increased lightness to help distinguish one image from the other).Ĭlearly, the biggest saving comes from using Photoshop’s native Save for Web function. LEFT IMAGE = Photoshop Save for Web 75% = 275 kb (without added lightness). I have increased this image’s visible lightness to help you see that you are viewing two files. On the right is that same file compressed by Photoshop using its native Save for Web function. Use the blue circle slider to see if you can view any differences between them.įor the first pair, on the left is a jpeg that has been downsampled to 72dpi in Photoshop, then exported with Save As to produce a file that is 647 kb in size. Example image files compressedīelow are two pairs of files shown side-by-side. I back that up: I was completely unable to see any visible difference between the files that I compressed with Photoshop and these same ones after I had re-compressed them with JPEGmini. The JPEGmini algorithm imitates the perceptual qualities of the human visual system, ensuring that each photo is compressed to the maximum extent possible by removing redundancies, without creating any visual artifacts in the process. JPEGmini is capable of reducing the file size of standard JPEG photos by up to 80% (5X), while the resulting photos are visually identical to the original photos. JPEGmini is a patented photo recompression technology, which significantly reduces the size of photographs without affecting their perceptual quality. The publishers of JPEGmini say the following about that: ![]() Reducing image file size without affecting their perceptual qualityĪnd because size isn’t everything with images, we need to look closely at image quality. Percentage of file size saved after re-compression: Total disk space saved after re-compression with JPEGmini: Total size of files after re-compression with JPEGmini: Total size of files before re-compression with JPEGmini: Bulk re-compression statistics with JPEGmini Measured I now use JPEGmini on top of these files, post-processing them once more for an even more dramatic reduction in file size. This has always made a dramatic shrinkage in file size. Sometimes I check the visual result but typically these settings work well enough. I’ve settled on a 75% quality setting which I dip beneath for extra-large files that require a bit more compression. I usually save jpeg files as Progressive jpegs to the sRGB colour space. I’ve run this on image files that I have already pre-processed in Photoshop using the Save for Web feature. As files are re-compressed the app slides a miniaturised version of each into its interface and various counters are incremented: the number of photos processed, the total file size processed and the percentage of file size reduction attained during the current run and an accumulated file size reduction attained since the app was first used. You can drag files to be compressed onto its interface or you can select them from a standard file-select dialog. You can choose to have JPEGmini re-compress files and then overwrite the original versions or to save them to a different destination of your choice. ![]() The interface is minimal, as are configurable options. I’ve been using the standalone application on Windows and enjoying some very interesting results. You can opt into the use of a web uploader and a mobile SDK. There are separate server modules for developers which can be addressed through a command line or integrated into an existing image-processing workflow. It comes in two formats: a standalone app for Windows or iOS, or as a suite that includes the desktop app and Photoshop, Lightroom and Capture One plug-ins. I still use it and I’ve also recently found an even better way of compressing web images.
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