Create a Computer Star Field......

[david strachan]

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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

Edited January 2, 2015 by david strachan

[JimKasson]

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

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[pico]

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.

Edited January 4, 2015 by pico

[david strachan]

Thanks Pico

That's what I want.

All best

cheers Dave S