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How do I read an image file in .fits format and convert it to.png or .tiff?

Asked by Vanessa Phung on 11 Dec 2018
Latest activity Commented on by Vanessa Phung on 7 Jan 2019
I have images in .fits extension. I'd like to open it in matlab and convert it to other format such as .png or .tiff.
Any suggestion on how should I start?

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2 Answers

Answer by Mark Sherstan on 11 Dec 2018
 Accepted Answer

Use fitsread() and imwrite() if you need further help please post the file you are working with.

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Thank you for your comment, Mark and Chad.
Initially, I only get all ' solid color' for the image after imwrite.
However, I adjusted the contrast and save the image in .png using the codes as show here.
data = fitsread(filename,'primary');
% --rotate and flip image file--
data2 = imrotate(data,180);
data2= fliplr(data2);
% --for contrast to see image--
factor=0.1;
clow =min(data2(:));
chigh=max(data2(:))*factor;
clims = [clow chigh] ;
A=data2;
A=A-clims(1);
A= A/clims(2)/factor;
imwrite(A,'testinn.png', 'BitDepth', 16);
figure(1); imshow('testinn.png');
% --figure file save
h = figure(2);
set(h,'Visible',vkey);
img1= imagesc(data2, clims);colorbar;title(sprintf('fn:# %d',fnum));colormap(jet);
%---save this figure in directory---%
print(h,'MySavedPlot','-dpng');
testinn.png
If you have any suggestions on getting the good contrast directly, I'd be happy to learn about it.
Using imagesc, I manage to get this. (max. is actually 23000, that's why I get poor contrast
initially)
MySavedPlot.png

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Answer by Chad Greene
on 11 Dec 2018

You should be able to read it with fitsread and then save it to png or tiff with imwrite.

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