Одним из способов уменьшения времени отклика страниц сайта является оптимизация. CSSTricks reader Norm writes in to ask me about a problem he is having with color on a new site he is designing I have a graphical question about my test. Imageoptim Windows' title='Imageoptim Windows' />Free Image Optimizer Compress and resize photos. Using this free online service, you can resize, compress and optimize your image files. Using the service is as easy as clicking of button Optimized images are better They are more suitable for web pages, email attachments, or even storage on your disk. Give it a try nowYesterdays love notes are todays sexts. While both show affection, one comes with higher risks. Xrated texts have risen in popularity among smartphone. When youre looking to boost your websites performance, some would recommend you jump straight into a detailed analysis of each page the HTTP requests youre making, any redirects involved, the position of scripts and style sheets, and more. But while theres no doubt that examining these issues can help, its important to consider the basics first. In particular, are you sure that any graphics youre using are fully optimised for the webYouve probably already made sure to choose the appropriate format for each image as well as keeping its size in pixels to a minimum. Maybe youve reduced the JPEG quality setting as much as you can. Although if youre not quite confident in your knowledge of the fundamentals then the Designers Guide to Image Compression may help. The unfortunate reality is that, no matter how carefully you design your images, the graphics tool youre using will not save the finished files in the most efficient way. And so passing those images through a compression tool can reduce their size considerably. Exactly how much you can save is tricky to say for sure as it depends very much on your source graphics. Some JPGs may only drop by 5. Its not unusual for regular web graphics to be compressed by 1. JPEGs can cut file sizes even more. Testing. Which programs are the best, thenSave bandwidth and accelerate your sites performance with these powerful free tools Mike Williams puts them through their paces. A free book on modern image optimization techniques. Formats, decoders, techniques for efficient compression and more are covered. ImageOptim-v-1-7-support-SVG-img-1024x602.jpg' alt='Imageoptim Windows' title='Imageoptim Windows' />Good question. To help provide an answer weve pitched 1. The bulk of these are Windows based lossless compression tools as theyre the most interesting reducing file size without reducing image quality is a very appealing idea. But weve also included lossy compression options, Mac programs and web services, so there really is something here for everyone. We then asked every package to compress the same sets of GIF, PNG and JPG images, each of which were actual web graphics wed found on a range of real sites, and made a note of the savings. We checked the programs for other issues, too. Were they easy to use How fast was the compression process And how reliable Could a program sometimes increase an image size, for instance And the results were very interesting and often a real surprise. Keep reading to find out what we discovered. The programs. An ancient command line tool with the minimum of help, Advance. COMP isnt exactly going to appeal to the average PC user. If youre not put off by batch files, though, its easy to use. A simple line like for a in C PNG FileFolder. However, the end results are disappointing with our test PNG web graphics dropping by an average of 1. That is of course considerably better than doing nothing at all, though. And if you want to combine several tools together to get the maximum PNG compression then Advance. COMP may be able to play a part. Caesium is a simple open source tool that helps you to compress PNG, JPG and BMP formats. JPEGmini reduces image size by up to 80 without compromising quality. PNG compression app for Windows. Uses PNGOUT, OptiPNG, and DeflOpt to create the smallest PNGs, without sacrificing any image quality. Software Javier Gutirrez Chamorro Guti FileOptimizer, SumatraPDFOpt, TBClamAV, ClamAVOpt, RealSpeed, RLE64, WinVer, TXT2PDF, Lamark, XPlorer, SMETAR, MEMTRACE. Its an easy program to use. Click the Add program, choose your images, select an Output folder, click Compress and youll have your results within seconds. BMP compression isnt of interest to us, and the programs JPG technology isnt anything special, either. Imageoptim Windows' title='Imageoptim Windows' />Theres no lossless option it just reencodes the file at your chosen quality setting. Caesium does provide support lossless PNG compression, although this has a major limitation. It can only output 2. And the programs results clearly illustrated the problem, with most of our test PNG web graphics actually increasing in size. Fortunately, you can tell Caesium not to write a file in that case. Imageoptim Windows' title='Imageoptim Windows' />But even then the overall size of our images fell by a very feeble 1. Clearly most people will be better off elsewhere. FILEminimizer Pictures takes a more drastic approach to image compression than most of the competition. 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. Although, fortunately, you can adjust most of this in the programs settings. In use, the program follows the usual format. Once youve pointed it to your source files, chosen an output folder, perhaps configured an option or two, one click is enough to begin optimisation. And its fairly quick, so youre not kept in suspense for very long. How well does it do That varied depending on format at least for our tests. PNG compression rates were nothing special at 2. GIF compression was a more average 1. JPG web graphics dropped in size by 3. Whether this sort of reduction is enough to justify compromising image quality is another matter. FILEminimizer Pictures program is versatile, configurable and easy to use, though, and if thats more your priority then it may be worth trying the program for yourself. Theres no doubting File. Optimizers ambition. 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. Surprisingly, though, theres no increase in complexity. Chartering And Vessel Operations Software more. In fact, the program has one of the most straightforward interfaces here drag and drop your images onto File. Optimizer, right click, choose Optimize and thats it. This simplicity has a down side as your source files are replaced by the program. The originals are sent to the Recycle Bin so remain recoverable, for a while at least. But this could be a problem. Of course its compression that really matters and here is where File. Optimizer delivers some great results. For instance, the program shrank our PNG test graphics by 4. JPEG and GIF compression rates were more standard at 1. File. Optimizer especially if you can also use it to compress other downloads on your site. Image. Optim is a Mac tool that optimises GIF, JPEG and PNG images by acting as a front end for a host of other applications PNGOUT, Adv. PNG, Pngcrush, extended Opti. PNG, Jpeg. Optim, jpegrescan, jpegtran, and Gifsicle. The program is all about lossless compression removing comments, colour profiles and so on rather than re encoding or reducing the number of colours. As a result it wont cut file sizes by quite as much as some of the competition, but at least you dont have to worry about any loss in image quality. Image. Optims front end works well, too. Drag on a single file, a group, a folder or whatever, and it immediately starts compressing each image and displaying the results. The program isnt the fastest tool around, but unless youre giving it thousands of HD JPEGs thats probably not going to be a problem. The end results were solid, but not spectacular. Our GIF web graphics were reduced in size by 1. PNGs by 1. 7. 8 per cent, JPGs by 1. You can do better elsewhere with individual tools, then. But if you just want a single, simple Mac based tool, which can handle GIFs, JPEGs and PNG files, then Image. Optim looks like a very sensible choice. JPEGmini is an interesting app with a two pronged approach to shrinking JPEGs. First, it uses a smart algorithm to figure out how much an image can be compressed without visible effects so the program isnt lossless, but its not just re encoding at some fixed quality setting, too. And then the program uses its own JPEG encoder to try and deliver the most compact files possible. Theres plenty going on in the background, but none of this is visible to the user. Just drag and drop your pictures onto the program a maximum of 2. The results here can vary greatly. Our JPG web graphics saw little reduction, 8. For simple web graphics JPEGmini doesnt do anything too amazing. The compression possibilities ramp up considerably as your images get larger.