The objective of image compression is to reduce irrelevance and redundancy of the image data in order to be able to store or transmit data in an efficient form.
Properties:
The best image quality at a given bit-rate (or compression rate) is the main goal of image compression, however, there are other important properties of image compression schemes:
- Scalability: Generally refers to a quality reduction achieved by manipulation of the bit stream or file (without decompression and re-compression).
- Quality progressive or layer progressive: The bitstream successively refines the reconstructed image.
- Resolution progressive: First encode a lower image resolution; then encode the difference to higher resolutions.
With page speed a ranking SEO factor and consumers expecting exceedingly fast web experiences, it's crucial to get aggressive and take control of your image sizes to deliver a faster loading website to your users.
Image compression is either lossy or lossless: Lossy works by discarding information from the original file, and lossless retains all the original data (though, the file size tends to be bigger). There's a variety of image compression algorithms that take different approaches to reducing file size, and the tools listed below utilize a number of those to minimize the size of your images.
1. TinyPNG
TinyPNG enables advanced lossy compression for PNG images. It preserves full alpha transparency and reduces the file size by selectively decreasing the number of colors and bytes in the image. The effect is nearly invisible, but it makes a large difference in file size. It takes 24-bit PNG files and converts them to much smaller 8-bit indexed color images, with all unnecessary metadata stripped as well.
2. DynamicDrive-Image Optimizer
Image Optimizer lets you easily optimize your gifs, animated gifs, jpgs, and pngs, so they load as fast as possible on your site. Furthermore, you can easily convert from one image type to another. Upload Size limit: 2.86 MB
3. Image Optimizer
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 now!
4. Web Resizer
This free online image Web Resizer helps you optimize photos for web or email. Easy to use. Amazing results!
5. Ranking Easy
Easily optimize your web images so they load as fast as possible on your site. Compressing your images will result in faster loading webpages, enhancing thus the usability of your website
6. Jpeg Mini
Reduce the file size of your photos by up to 5x, while keeping their original quality and JPEG format! JPEGMini can help reduce the file size of your photos up to five times smaller, while keeping their original quality. It's available for Mac OS X and Windows as a desktop app, available as a free (limited) or a paid version.
7. Smush.it
Smush.it is an online service from the Yahoo! Developer Network that optimizes your images. It uses lossless compression techniques, so the file size is reduced without changing the look or visual quality of the image.The uploader supports JPEG, GIF and PNG files with maximum sizes of 1MB. The optimized results are available for download from a temporary URL, which is valid for up to 30 minutes afterwards technology.
8. RIOT
RIOT (Radical Image Optimization Tool) is a free program to optimize images for the web efficiently. It includes an easy-to-use interface to compare the original with the optimized image in real time, so you can instantly see the resulting file size.The program is lightweight, fast and boasts powerful features for more advanced users. It supports various formats and features automatic optimization that selects the most suitable format and parameters.
9. PNG Gauntlet
PNG Gauntlet lets you optimize PNG files and is available for Windows. It combines PNGOUT,OptiPNG and DeflOpt to create the smallest file sizes possible, with no reduction in image quality.The program converts JPG, GIF, TIFF and BMP files to PNG, and gives individual progress bars for each file, highlighting the file that is currently compressing, and a status bar to keep track of the total bytes saved.
10.CompressNow
CompressNow is a free online service that lets you upload images from your computer, choose a compression percentage and download the optimized image. It supports GIF, JPG and PNG formats.The service also allows the drag and drop of multiple images from you computer, with a max upload of 10 images and a max individual file size of 3MB.
11. Shrink Pictures
Shrink Pictures allows you to resize pictures and choose the level of compression applied, and it supports JPG, GIF and PNG. You can select the maximum image dimension, apply special effects, and download the optimized images.Shrink Pictures ensures privacy by using an automated script to remove any processed images from the server.
12 Image Optim
ImageOptim optimizes images — so they take up less disk space and load faster — by finding best compression parameters and by removing unnecessary comments and colorprofiles. It handles PNG, JPEG and GIF animations.
13.JPEG Reducer
Shrinking your jpegs and photos will make them load faster. Large images take a long time to download from a web server and the longer someone waits, the more likely they are to move onto another website or images.
It's Done..!!
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