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Array resize with arbitrary arithmetic [message #52945]

Mon, 12 March 2007 13:23

rpertaub@gmail.com
Messages: 43
Registered: January 2007

Member

I have this 640x240 array. I need to change it to a 320x240 array.
However, in first array, consecutive 2 pixels hold information for 1
pixel in second array and I need to do a certain bit of arithmetic to
obtain that. This should not be too difficult, except I keep getting
errors and I am not sure why:
This is what I do:

pro compress_image

image=read_bmp('9 March 2007\775u.bmp') ; 640x240 array

comp_image=make_array(76800,/long) ;1x76800 array that I can
reform to 320x240array later

temp=0

for j=0,239 DO BEGIN
for i=0,319 DO BEGIN

comp_image[0,temp]= image[2*i,j]*256 + image[2*i+1,j] ;
arithmetic necessary
temp=temp+1
endfor

endfor

end

Any insight would really be appreciated!
Thanks
Radha

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