In the Rosette example I had to go a little higher on the curve. You want to place an anchor about a quarter of a way up the curve so that the dim areas of the star selection remain unchanged. The effects are subtle and if you over do it your stars can end up looking unnatural with very sharp borders.īring up the curves dialogue box. There are a couple of things you can do in photoshop to enhance star appearance. It is therefore very easy to guage the impact. Slide right over to the left and you have taken away all the effect of the minimum filter. You normally need to choose somewhere between 50 and 70%. On the rosette image I have gone down to 50%. Now you can reduce the minimum effect to a sub pixel value. When dealing with these you should select them manually so as not to obliterate the smaller stars.Ĭlick OK on the minimum box and then go to the edit menu and select fade minimum. It is only necessary to select more than 1 pixel radius when dealing with very large bloated stars. Don’t be alarmed if you see that most of your stars have disappeared. Make sure the star layer is selected then select filter from the file menu, select “other” then minimum. It isn’t essential to create a star layer to do this, you can do a quick job just by using the colour range selection tool however since we have created a star layer we might as well use it. If the border around the stars is too large it can effect the overall image slightly. This is a particular problem in the example I have chosen here of the Rosette Nebula since there are so many stars in the “target area”. You need to keep it to a minimum that will prevent artefacts developing. You may need to experiment with the size of your expansion. You will need to start by creating a star layer as described in the Star Layer primer. Here are some techniques to help improve the problem. We know that stars are point sources of light so big blobby stars all over our image is bound to detract from it.īloated stars can be the result of a number of factors including optical defects, poor seeing and the characteristics of the ccd. I need to re upload the images but for now you can find the primers with images on my web site Go to the resources sectionĪ common problem for our images is bloated or fuzzy stars.
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