圖片減肥工具 – Radical Image Optimization Tool（簡稱 RIOT），可以將各式各樣圖片檔的「大小」最佳化後輸出為JPG、GIF、PNG格式，還有指定大小的壓縮功能（Compress to size），對於加快網頁讀取的速度，或者，應付有大小限制的圖片上傳是很有幫助的。（阿榮）（下載）
阿榮評語：
[2013.08.31] 感謝讀者「tony200910041」通知改版訊息。
Radical Image Optimization Tool (RIOT for short) is a free image optimizer that will let you to visually adjust compression parameters while keeping minimum filesize.
It uses with a side by side (dual view) or single view interface to compare the original with the optimized image in real time and instantly see the resulting file size.
It is lightweight, fast and simple to use, yet powerful for advanced users. You will be able to control compression, number of colors, metadata settings and much more, and select image format (JPG, GIF or PNG) for your output file.
[改版訊息] [教學] [官方載點 – 安裝版]
下載連結→ [按此下載免安裝版]
免安裝版 [0.5.2] [0.5.1] [0.5.0] [0.4.6]
Source: azofreeware.com