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Re: to convert pixel numbers into wavelength [message #70190]

Mon, 22 March 2010 08:58

penteado
Messages: 866
Registered: February 2018

Senior Member
Administrator

On Mar 22, 10:57 am, sid <gunvicsi...@gmail.com> wrote:
> My data is in fits format which is taken using 1k by 1k ccd. So the
> data has 1024 rows and 1024 columns each having different count
> values. I need to convert this pixel number by wavelength, to do that,
> im having a relation like,
> lamda(n)=lamda(0)+n(dispersion)

Just use what you wrote:

lambda=lambda_0+dindgen(1024)*dispersion
iplot,lambda,flux

Where lambda_0, dispersion and flux are the variables you got from the
file. In case you are wondering, dindgen(1024) is a function that
returns an array with 1024 elements, with values from 0 to 1023.

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