![]() ![]() SAOImage DS9 is freely available for a number of platforms including Windows, Mac, and Linux. I took these images using, telescope 33, on December I have made sample FITS files available for download for this tutorial – these are the same files I worked with to create this tutorial. The rest of this article describes the process. The nice thing is that the process of creating an RGB image is So clearly, SAOImage DS9 is superior to both JS9 and FITS Have good data to begin with, which is the case here). However, MaxIM DL is expensive so you should expect good results (assuming you This image reveals the most detail of all of the images I created the following image using SAOImage DS9:Ĭlearly this image is far better than the other two with moreĪnd finally, for the sake of comparison, I processed theįITS files using MaxIM DL and came up with this image: The image, however, is less noisy and grainyĮven though the same underlying FITS files were used to create this image as The details of the nebula are more easily resolved, yet the I used the directions in Using FITS Liberator To Create An RGB Image to create the following image: Is difficult to make out the nebula in this image – the image is noisy and I followed my own directions in Using ’s JS9 FITS Editor To Create RGB Images to create a final image of NGC 3195:Īlthough the image is cropped and zoomed in quite a bit, it NGC 3195 is a small target sized at just 40 x 35 arcseconds, so the image manipulation software must have good resolution for the target to show up in the final image. Let’s look at the results of basic processing of a planetary nebula. With options like the online FITS viewer JS9 and JS9-4L andįITS Liberator, why would you use SAOImage DS9?Įach of the applications implements their algorithms differently which produces different results. This article walks you through creating an RGB image using SAOImage DS9 is used for variousĪnalysis of Chandra X-Ray as well as other FITS data. Quite probably there is a more elegant solution, but this works.SAOImage DS9 is a FITS file viewing and manipulationĪpplication from the Chandra X-ray Science Center (CXC) and the High EnergyĪstrophysics Science Archive Center (HEASARC). Use you favourite editor to attach these lists to each other. ![]() This will then give you a list of the RA, Dec of the same sources. If you want to match this up with the 2MASS sources then you have to "list regions" again, but this time select "fk5" as the coordinate system. This will give you a list of x,y coordinates. From this, select "x,y" for the format and "image" for the coordinate system. Another dialogue box will open asking you to select the format and coordinate system. Then, in the main image window open the "Regions" dialogue and select "List regions". From the "File" dialogue, select "Copy to regions". When you load the catalog you should see a window open entitled "2MASS Point sources" which lists all the sources in your image. Is what you are asking - how do I get the x,y coordinates of these 2MASS sources in my image? Or do you wish to know what the x,y coordinates of the actual sources in your image? If the latter then you will need some other software like Sextractor or DAOphot to do source-searching and parameterisation in your image. When you load the 2MASS catalogue, SAOimage is able to use the RA and Dec in the catalogue to calculate the x,y positions of the catalog sources in your image (and marks them as green circles). OK, it seems to me that what you have is a fits image (from where?) that has some world coordinate system information attached.
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