![]() GIF is also best used for simple animations. PNG (Portable Network Graphics) PNG images come in two flavors.In this mode, due to the large palette size, PNG images can slow down your blog or website. In this mode the file size can almost be cut by 70%. Most PNG’s you will use will probably be True Color, so downsizing it to 256 (or less) can make a big difference. However, the image quality will suffer if the original image contained 1000 or more colors. A good color dithering algorithm is required (see below for the best tools). Here is a good link from Google that explains in detail what image format to use on your site, depending on its main purpose.Įven if your website or blog posts have one or a few images, optimizing can make the pages load faster. ![]() And if you use a lot of images per post, then it becomes even more imperative that you optimize those images, because page load time can be much slower. This need makes sense when you read this link on how long page load times can make your visitors back-out before the images all finish loading. So now comes the need for free software that optimize your images and makes your pages load faster. The following is what we have installed on our computers to optimize the images on our website (we have a lot!) Image Processing Tools Xnconvert tutorial for free# Some of the below tools just compress files, resize, or convert, and some do all three functions. Let’s review them and see which ones you like. ![]() The GIMP image editor is more like a free version of Photoshop. It can do all three functions needed in image optimization ( convert, resize, compress). However, quality suffers quite a bit when resizing. It can convert one file to another, and has good JPEG compression settings. It also can significantly decrease a GIF animation file size. The 256 PNG conversion does not have good color dithering options, so the quality on 256 color images suffer. Well it is not free, you can get it cheap on monthly payments. And GIF animated files can be easily edited and compressed smaller than GIMP can do. Note: You can get the Photoshop Elements version at a low cost. XnConvert has many features like batch processing many images at once. You can perform edits like convert, resize, crop, change color depth, etc. I found that resizing and lowering PNGs to 256 or less colors produced poorer quality results than some of the other tools here. But processing JPEG images are very good. This is the popular command-line utility for compressing PNG files in batches. You can download GUI programs to make it easy to use. I use PNGgoo for Windows or ImageAlpha for the Mac. What pngquant does is compress PNG files in 256 colors. You can convert and compress a True Color PNG with hardly any image degradation. If you need an image as a PNG, then this utility blows everything away. However, the image files are a bit larger that what some others can do. Also, there is no image resizing or editing, and you will have to use one of the other tools to covert to PNG first. JPEGmini compresses JPG images with no loss in quality. It does the same that pngquant does for PNG’s. But there is no compression percentage to adjust, so the files can be larger than what the other utility’s here can do. If you want the very best quality for your JPEG images with good compression, that JPEGmini is for you. Downside is you have to use another tool to convert to JPG first. The trial version allows 20 jpg’s per day, but you can purchase it for a fee. This is one of our favorites for Windows. You can convert, resize, and compress images with very good quality results. There is batch file processing for multiple images at once. There is a bug in PNG batches, so I do one at a time, but JPG batches work fine. You can see the before and after results on an image before compressing or resizing. ![]() IrfanView – Īnother excellent image processor. IrfanView is like XnConvert with a lot of editing options and batch processing if you have a lot of images. Resizing and JPG compression is very good. Be careful when batch processing down to 256 PNG images (depending on the image there may be poor image quality). For Windows. 7 image processing tools with pros and cons to them all.
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