You've gotta have something wonky going on, because just doing the math:
With 1000 colors per image (way way high, I assume it's going to be like 100 realistically)
And 130,000 images
(1000 * 4 + 4 + 4) * 130,000 = 521040000 bytes or 521 megabytes.
Even if I got something wrong with my interpretation of what you're saying, my overestimate of color count should make your final file size around that size or smaller.
Did you scrape images like this?
http://www.drsloth.com/view/22560
Edited by Nonexistent, 29 May 2016 - 08:24 PM.