Re: [APML] A Curves Exercise [was: Histograms, curving and layers]

[mike halderman <astro@mrh.org>]

Matt,

      I curved each channel separately with PWpro, put them back together
and then finshed curving with Gimp.  

    http://www.mrh.org/matt-m2.jpg

I was not trying to make it look your processed version, but it came
out very similar anyway.  I did the background by eye only, so it may
be a bit off.  That was fun.

-mike

Matt BenDaniel <matt@starmatt.com> writes:

> Alan,
>
> The most important skill to master in image processing is curves. By far, you'll get more bang out of curves than any other tool. Both Photoshop and PictureWindow have good curves tools.
>
> I made an exercise for you (and anyone else who might be interested). 
>
> I place an uncurved image of Central Auriga on my web site. Save the uncurved image onto your disk. Using solely a curves layer, try to make the color balance and contrast of the uncurved picture look like my curved one. All you need concern yourself with at this point is adjusting the R, G, and B curves in a single adjustment layer. That's it. I already took care of stacking, AV-ing and star shaping the uncurved image, so you don't need to worry about any of that with this image.
>
> Now, I don't claim that this exercise is easy. But if you do it right, you should be able to make the uncurved image look just like the curved one on my web page.  The link to the uncurved image is at the bottom of the page:
>
> http://starmatt.com/gallery/astro/central_auriga.html
>
> I hope this exercise is helpful to you and others. Please let me know if you have questions, problems or have results to share.
>

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