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 Post subject: More Curves (matching tones)
PostPosted: Wed Jul 11, 2012 2:48 pm  (#1) 
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This time it's using Sample Points and curves to approximate the colors from another source (in this example, Vermeer's Girl with a Pearl Earring).

Getting Around in GIMP - More Color Curves

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 Post subject: Re: More Curves (matching tones)
PostPosted: Wed Jul 11, 2012 2:57 pm  (#2) 
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Haven't viewed the video yet, but your website tutorial looks pretty good Pat. :)

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 Post subject: Re: More Curves (matching tones)
PostPosted: Wed Jul 11, 2012 3:14 pm  (#3) 
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Thanks, Lyle.

You can probably just skip the video if you read the tut. I'm not normally a fan of video tutorials unless what's being explained is a real PITA to demonstrate through any other means...

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 Post subject: Re: More Curves (matching tones)
PostPosted: Wed Jul 11, 2012 5:17 pm  (#4) 
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Thanks, I'm bookmarking this.
And doubling the thanks because I already found some usage from your predefined color curves (:


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 Post subject: Re: More Curves (matching tones)
PostPosted: Wed Jul 11, 2012 6:14 pm  (#5) 
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Yet another of your fine tuts...

I do agree with your remark about getting the values on single pixels, though. One could forgo the synthetic view of sample points, and use the color picker with some sampling radius to set foreground and background colors from both pictures, read the values in the color selector and work from that.

Now for the nasty question... this assumes that both images have about the same overall lightness/exposure, but is there a good technique to adjust the lightness of one image to match the other one?

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 Post subject: Re: More Curves (matching tones)
PostPosted: Wed Jul 11, 2012 9:23 pm  (#6) 
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ofnuts wrote:
I do agree with your remark about getting the values on single pixels, though. One could forgo the synthetic view of sample points, and use the color picker with some sampling radius to set foreground and background colors from both pictures, read the values in the color selector and work from that.

Yeah, I ran around a few times trying to find a good workflow for this, and this was also one way I thought might work. The problem is that I cannot change the sampling area while the curves dialog stays active (forcing me to save the curve as a favorite, resample, then reopen the curve again). It might be worth it for the ability to set a sample radius, though...

ofnuts wrote:
Now for the nasty question... this assumes that both images have about the same overall lightness/exposure, but is there a good technique to adjust the lightness of one image to match the other one?

This is a nasty question, and I don't have a good answer. Other than manual attempts to level the overall lightness to match, I'm not sure. In the past I've visually sampled points/areas that I want to be similar values, but nothing other than eyeballing what looks good to me...

I'd be really interested if anyone has any good suggestions as well! :)

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 Post subject: Re: More Curves (matching tones)
PostPosted: Wed Jul 11, 2012 10:08 pm  (#7) 
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Video tutorials are great, however a text version should always be at hand.
A big thanks to yours, Pat and everyone else that does both!
Some people like the movie others prefer the book.

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 Post subject: Re: More Curves (matching tones)
PostPosted: Wed Jul 11, 2012 11:50 pm  (#8) 
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You wouldn't happen to be able to either post your curves files or zip them all up? I working on a photography suite and curves are needed. You could send me a pm. PS I love the Orange Teal hell one you relinked on your blog.

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 Post subject: Re: More Curves (matching tones)
PostPosted: Thu Jul 12, 2012 4:05 am  (#9) 
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Odinbc wrote:
Video tutorials are great, however a text version should always be at hand.


I second this, because I rarely understand spoken tutorials, except for those in my native language, obviously.


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 Post subject: Re: More Curves (matching tones)
PostPosted: Thu Jul 12, 2012 9:57 am  (#10) 
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anarkhya wrote:
Odinbc wrote:
Video tutorials are great, however a text version should always be at hand.


I second this, because I rarely understand spoken tutorials, except for those in my native language, obviously.

This is one of the main reasons I don't like vid tutorials. The worst offender in my opinion is creating a video tutorial just to show something that would take less than a minute to explain/do in text/images...

ZWard117 wrote:
You wouldn't happen to be able to either post your curves files or zip them all up? I working on a photography suite and curves are needed. You could send me a pm. PS I love the Orange Teal hell one you relinked on your blog.


I didn't actually save any of the curves I played with for the tutorial, but I will go ahead and re-create them and update the post in a bit with them.

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 Post subject: Re: More Curves (matching tones)
PostPosted: Thu Jul 12, 2012 10:17 am  (#11) 
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Thanks very much!

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 Post subject: Re: More Curves (matching tones)
PostPosted: Thu Jul 12, 2012 11:29 am  (#12) 
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I've gone ahead and packaged up some quick sample curves.

There's the Vermeer (Girl with the Pearl Earring),
the Fa Presto (St. Michael),
the Orange/Teal Hell,
and one I was playing with this morning from Norman Rockwell.

I'd suggest using them as a starting off point rather than directly - try fiddling with the curves once loaded (if you keep the relative ratios of the curves rgb to each other, it will maintain a similar feel, you're just adjusting the intensity).

I've also got a load that I emulated from PS (MCP and Florabella) if you might be interested...

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 Post subject: Re: More Curves (matching tones)
PostPosted: Thu Jul 12, 2012 3:24 pm  (#13) 
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patdavid wrote:
anarkhya wrote:
Odinbc wrote:
Video tutorials are great, however a text version should always be at hand.


I second this, because I rarely understand spoken tutorials, except for those in my native language, obviously.

This is one of the main reasons I don't like vid tutorials. The worst offender in my opinion is creating a video tutorial just to show something that would take less than a minute to explain/do in text/images...

And video tuts, by design, can't tell much more than what shows up on screen. So they just show how things happen and not why(*). Just enough to repeat the moves like trained monkeys, but not to come up with your own, unlike PatDavid's tuts, that are essentially great mind openers...

(*) plus, they often cheat... they start with the picture ideally suited for the job... But things may be more difficult, and beginners are left struggling with small real-life details, such as a murky picture from a low-grade camera on which selections spill over, uneven backgrounds, pictures taken on the web (PNG that obviously had a first life as JPEG or GIF)...

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 Post subject: Re: More Curves (matching tones)
PostPosted: Thu Jul 12, 2012 3:29 pm  (#14) 
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yes that always seems to happen with me...following a tutorial to cut out a pic with hair or render a background out, and mine always has a busy background and I try to follow along and it's mostly a fail.


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 Post subject: Re: More Curves (matching tones)
PostPosted: Fri Jul 13, 2012 11:50 am  (#15) 
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Thanks for a great tutorial and some killer links :)


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 Post subject: Re: More Curves (matching tones)
PostPosted: Wed Jul 18, 2012 1:36 pm  (#16) 
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Nice tutorials Pat. I also appreciated the Contour Painting.

I'm not a big video tutorial fan either. I don't work that fast. I always have to pause, rewind, wonder what they left out. I did think Jolie did a good job with hers. I tried to watch one of GimpKnowHow's videos.


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 Post subject: Re: More Curves (matching tones)
PostPosted: Wed Jul 18, 2012 4:27 pm  (#17) 
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Thanks! I'm glad they're helpful in some way...

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 Post subject: Re: More Curves (matching tones)
PostPosted: Mon Aug 20, 2012 8:20 am  (#18) 
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a very instructive and helpful tutorial, thank you! i've been very careful with using the curves dialog before, i think i got over that now :).

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