# -*- coding: utf-8 -*-
"""
Created on Tue Jun  3 15:09:43 2014

@author: babar
"""


# PACS example:

nImages = 150000  
nPix = 2048

# Size in RAM

pixBits = 64
size = nImages * nPix * pixBits
print "Size in RAM in GB is "
print size / 1e9 / 8  # 1e9 for Giga, 8 for bytes

# Answer is 2.46 GB

# Size in FITS image file

pixBits = 16
compression = 1./2.
size = nImages * nPix * pixBits * compression
print "Size in FITS file in GB is "
print size / 1e9 / 8