1.Hey friends I Want to Compress the image in order upload them in my website. I have scanned them now what i need to do is to reduce their size. For that i need open source software to compress them. so, will anybody help me for finding it. 2. Next problem is i have made graph using geogebra. So, i need to upload them too. But i don't have idea that which size will be best (pixel,width, breadth) and format like (.png, .eps, .jpg) I will be thankful if anybody suggest me. Note: Software that is supported by Ubuntu or Windows 7 (anyone).