Usually when I email an image to someone, I want them to have an image that will fit on their screen.
So all you have to do is resize to image to 800 x 600. That will also reduce the size of the file.
If you really just want to change the image from a TIF to a JPG and retain the same physical size and quality, you will only reduce the file size to about 1/4th the TIF file.
If you lower the quality, you can reduce the file size by a very large percent.
When doing a Save As and change the file type from TIF to JPG you will see a window pop-out called JPEG/GIF Save Options.
At the very top of that pop-out window is a Save Quality slider (0 to 100).
If you set it to 50, the Save As JPG file will be greatly reduced in file size.
Most people can not tell the difference in quality until you start using settings well below 50.
I am trying to convert some TIFF files to JPG format to decrease the file size. The original TIFF files are about 3,600 Kb and the dimensions are 19,024 X 14,396. I was hoping to make the file size smalled so I could work with them easier and send them in an email.
I found a thread here about using Irfanview to convert files http://forums.cnet.com/7723-6637_102-119216/converting-tiff-files-to-jpeg/ I downloaded Irfanview did the normal process, opened > saved as jpg format and the first file I saved went from 3,410 Kb to 21,042 Kb. Could I be doing something wrong or is there something going on with these files that I don't understand?