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 Post subject: Easy Peasy Colour Correction Method
PostPosted: January 5th, 2011, 2:19 pm 
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From Away

Joined: January 31st, 2010, 3:10 am
Posts: 51
OK, I get retardedly picky over colour correction, and have basically been eyeballing it, producing mixed results. This metod is simple as f**k and it works. There is a link to a video at photoworkshop.com but I know how ADD some of you get and it's a slow paced vid-so here's a quick writeup/ref.

Open your 16bit tiff(of course we're all editing in 16bit tiff, right? lol) ok, or maybe just open your image.

In cs2 , right click on what is most likely your eyedropper tool and change it to colour sampler tool make sure you have the 'info' tab displayed and open on the other monitor(or in the corner-however you do your editing) as you'll need it to do this.

up towards the top there is a button for sample size-if you're shooting with a hi-res camera set it from default(point sample) to 5-by-5. If you're for some reason touching up a small or low res scan or image and you don't have the original, or if you just shoot with a low rez(small MP) camera-use 3-by-3.

OK! Now you're ready to begin.

Armed with your c.s. tool pick what should be the whitest point in the image and click.(there are a couple exceptions-specular highlights-and any point where the value=a full 255 are out of bounds) now find what should be the blackest point in the image and click.

Now check in your info tab- you'll have a #1 R, G, B value and a #2 R, G, B value.

Now click Image->Adjustments->Levels

Move the levels window so that you can still see the info tab.

For the first set of values, look at the channel with the highest number. for example:

R: 247
G: 239
B: 230

What we want to do is change the highlight slider in each of the lower two channels to match the highest. So in this case, pull down green and slide to the left untill you get a value of 247, then pull down green and slide left untill you have a value of 247.
Now you'll see:
R: 247/247
G: 239/247
B: 230/247

OK! Almost there.

Now we need to do the shadow(black) side of the histogram. So take a peek at the second selection values. You'll probobly see something like:

R:8
G:12
B:21

Now in this case we want to do the opposite. We want to pick the lowest number and match the other two channels to that number.
SO, in this case it's R with a value of 8. Select the green channel and slide the shadow slider to the right to match the values. Do the same with the Blue channel. This will cause the first set of values to change slightly, and thats ok.

From here you have a couple of options. If you've shot a bunch of images back to back of roughly the same scene and the same lighting conditions, you can save this levels adjustment and apply it to the rest, or just click ok to apply the change.


*disclaimer-I'm sure that i've made grammar-spelling errors-but i didn't cut/paste even one word of this, so I'll reserve the right to come back and make changes.

Try this out, it doesn't take long, and the difference is insane.


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 Post subject: Re: Easy Peasy Colour Correction Method
PostPosted: January 5th, 2011, 2:20 pm 
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From Away

Joined: January 31st, 2010, 3:10 am
Posts: 51
wow, when i wrote that up CS2 was the current version of photoshop. No matter, still accurate today. :)


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 Post subject: Re: Easy Peasy Colour Correction Method
PostPosted: January 5th, 2011, 10:00 pm 
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True Islander

Joined: September 22nd, 2005, 1:43 pm
Posts: 6517
I've never edited in 16 bit tiff. iff that. haha!


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 Post subject: Re: Easy Peasy Colour Correction Method
PostPosted: January 6th, 2011, 12:21 pm 
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Member

Joined: December 30th, 2008, 9:41 pm
Posts: 1398
Location: Queens County
16bit or nothing for this guy!


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