Mike Cuffe

Hi James, thanks for your reply. As I'm sure you know the zip files downloaded from the Mast Portal are very large so not practical to attach here. So here's the contents of the Manifest HTML docs which came with the fits files I downloaded for Stephan's Quintet, I hope this gives you enough data to download the data yourself. mast:JWST/product/jw02732-o001_t001_nircam_clear-f090w_i2d.fits JWST/jw02732-o001_t001_nircam_clear-f090w/jw02732-o001_t001_nircam_clear-f090w_i2d.fits PUBLIC OK anonymous mast:JWST/product/jw02732-o001_t001_nircam_clear-f200w_i2d.fits JWST/jw02732-o001_t001_nircam_clear-f200w/jw02732-o001_t001_nircam_clear-f200w_i2d.fits PUBLIC OK anonymous mast:JWST/product/jw02732-o001_t001_nircam_clear-f444w_i2d.fits JWST/jw02732-o001_t001_nircam_clear-f444w/jw02732-o001_t001_nircam_clear-f444w_i2d.fits PUBLIC OK anonymous mast:JWST/product/jw02732-o001_t001_nircam_clear-f356w_i2d.fits JWST/jw02732-o001_t001_nircam_clear-f356w/jw02732-o001_t001_nircam_clear-f356w_i2d.fits PUBLIC OK anonymous mast:JWST/product/jw02732-o001_t001_nircam_clear-f150w_i2d.fits JWST/jw02732-o001_t001_nircam_clear-f150w/jw02732-o001_t001_nircam_clear-f150w_i2d.fits PUBLIC OK anonymous mast:JWST/product/jw02732-o001_t001_nircam_clear-f277w_i2d.fits JWST/jw02732-o001_t001_nircam_clear-f277w/jw02732-o001_t001_nircam_clear-f277w_i2d.fits PUBLIC OK anonymous This set illustrates the problem I've found on all JWST data I've so far downloaded, filters f090w, f150w and f200w are approximately 14000 x 12000 whereas filters f277w, f356w and f444w are approximately 7000 x 6000. I started off trying 'Align layers by stars' in the way you describe, I'd have to try it again, but I think I found that it would scale and align the bigger images to the smaller but it seems to struggle the other way round i.e. to align the smaller images to the bigger ones. So far my most successful method is to scale up the smaller files x2 to roughly the same size as the bigger ones, do a 'by eye' alignment (blend 50%) then let 'Align layers by stars' do the final alignment, it works (mostly) but it would be so much easier if all the data was the same size. If you think I should be able to download all filters in the same resolution then I'd love to know how to do it. Thanks for your help with this. Mike

I'm processing the publicly available raw images from the James Webb Space Telescope. The raw mono images are taken using different wavelength filters and by assigning different colours to each filter a full colour image produced. The problem I have is that some filters produce images that are half the size of others, so in order to overlay them they have to be stretched then aligned using 'Align Layers by Stars' but I am struggling to get the registration perfect. Is there a better way to stretch and align these images?