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alacant

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Hi everyone. Hardly any images here so far this year. Here's my first effort. Still can't get any blue in the stars. Maybe there aren't any blue stars and anyway I think I've overdone the noise blur layer. Not awfully inspiring I must admit, but as they say over here, algo es algo. So c'mon guys, show us what you've been imaging.

canon 700d on bresser nt150l, 1 hour

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11 minutes ago, PeterCPC said:

I can see blue in the stars.

Ah, thanks Peter. I wonder if it's my screen? Somehow, it always looks better on other folk's tablets or 'phones. The grass is always greener bluer? Must have a look...

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25 minutes ago, alacant said:

Hi everyone. Hardly any images here so far this year. Here's my first effort. Still can't get any blue in the stars. Maybe there aren't any blue stars and anyway I think I've overdone the noise blur layer. Not awfully inspiring I must admit, but as they say over here, algo es algo. So c'mon guys, show us what you've been imaging.

canon 700d on bresser nt150l, 1 hour

 

Looks good.  Nice sharp focus and a lovely FOV.

I can see blue on my MacBook Pro (retina screen), although it isn't popping out, it is there.

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I can see the presumed blue stars as white... Maybe red pushed a bit too long masks blue ? On my recent 1st try at this target I refrained from saturating colors too much, and I got stars less red and more blue-white (on my own mostly-color-calibrated viewing devices)

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3 hours ago, rotatux said:

I can see the presumed blue stars as white

Yeah, thanks. That's how I see them. Just looked on an iPad, and they're blue. Impossible. This seems so device sensitive it's hardly worth balancing colour. Give up!

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52 minutes ago, alacant said:

Yeah, thanks. That's how I see them. Just looked on an iPad, and they're blue. Impossible. This seems so device sensitive it's hardly worth balancing colour. Give up!

Either way there is a lovely contrast of colours there, and it is a well framed and focused image, so in all a definite keeper.

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This is what processing is for. I'd have a look at the B-V values for the stars in your image and work on the colour balance accordingly. If the background is neutral (R and G and B at parity) and the star colours accord with the astrophysics (B-V) I don't see how you can go too far wrong. Although I don't use it, PI has a routine for doing colour balance this way.

Olly

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2 hours ago, ollypenrice said:

(R and G and B at parity

Had a go with this one although I'd conclude that the monitor used to view the image seems to be far more of a limiting factor than I had previously realised, particularly it seems with blue. Of the screens I've tried, iPads are clear winners.

Cheers and clear skies from Alicante.

EDIT: Just tried a Microsoft surface pro. Yes please!

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On 05/01/2018 at 10:59, alacant said:

algo es algo

I have discovered Spanish memes...

 

Have you tried colour balancing your monitor?

Also I had terrible, terrible problems until I made sure every program I use uses the same colour and gamma profile.

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4 hours ago, alacant said:

Hi. Is that the grey-scale thing you adjust?

Yes but part of the story: this one only handles monochrome gamma and black/white points of the display. You have to use something that will let you calibrate colors also.

Searching "color gamma calibration images" gives things such as http://www.covingtoninnovations.com/DSLR/cal/MonitorCal.gif
or http://www.normankoren.com/GammaRGB.jpg
or http://www.ballisticpublishing.com/call_for_entries/colour_calibrate_gama2_2.jpg

That's typically what I use to grossly calibrate my displays (that is, unless the display is definitely reluctant to displaying correct colors, such as mine at work).

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