david strachan Posted January 2, 2015 Share #1 Posted January 2, 2015 Advertisement (gone after registration) I like testing lenses to their corners looking for aberrations. Particularly coma, and Chromatic aberrations, purple fringing etc. I want to make a starfield on my computer screen, to use as a photographic test image. I'm thinking I need about 30% screen as one to four pixel white, disbursed through a black background. Do you think this would work to look at lens corner aberrations? I just want points of light, not a USAF test chart. How would I do that on my PC computer in PS?? Thanks for any help you can offer. cheers Dave S Link to post Share on other sites More sharing options...
Advertisement Posted January 2, 2015 Posted January 2, 2015 Hi david strachan, Take a look here Create a Computer Star Field....... I'm sure you'll find what you were looking for!
JimKasson Posted January 4, 2015 Share #2 Posted January 4, 2015 I'm thinking I need about 30% screen as one to four pixel white, disbursed through a black background. Dave, I'm not quite getting what you want. Could you be more specific? Maybe you could create a little example image in Ps, blow it up 4000% with nearest neighbor, and post it. Jim Link to post Share on other sites More sharing options...
pico Posted January 4, 2015 Share #3 Posted January 4, 2015 You will not resolve a single pixel. What size pixel group would you prefer? Here is a pattern to look at 100% (1:1 pixel). View it in software that will give you 1:1 pixel. We can use it as a point of departure. Download this file. It is a perfect black and white grid. Small to download, too. Link to post Share on other sites More sharing options...
david strachan Posted January 5, 2015 Author Share #4 Posted January 5, 2015 Thanks Pico That's what I want. All best cheers Dave S Link to post Share on other sites More sharing options...
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