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Monday, June 07, 2010

Filed under: *VIDEO*CamerasCS5EditingPost ProductionSoftwareVisual Effects

A Color Correction Conundrum

Bruce A Johnson | 06/07

Hey you smart guys - help a guy out?  Please?

imageimage

Hey folks, remember I mentioned that one of my first big projects with the CS5/nVidia Mercury/CUDA combo is a choral concert?  Well, it is time to cut that puppy.  I recorded the concert with 3 Canon HDV cameras, which look great, and my brand-spankin’-new GoPro Hero HD camera.  Problem is, I didn’t have time to white balance the GoPro (in fact, I’m not even sure how you would go about it.  Gotta re-read the manual.)  In any event, I clamped the GoPro to a light stand and pointed it at the piano keyboard.  Blind, of course, since the GoPro has no monitor, but I had a good feeling about the framing.  What I didn’t count on was how far out the white balance would get.  You can look at the thumbnails on this page, or go find full-sized .TIFs of the GoPro shot and a reference from the back of the church at these Flick addresses:

The wide shot from the back of the church

and

the piano shot.

Honestly, I’d be happy just to get the piano shot *close* to the wide shot, but at this point I will take what I can get.  BTW, I would suggest you give tips using the basic PremPro color-correction tools, like 3-Way Color Corrector and such.  I’ve gone through a dozen interations, sometimes stacking different CC filters, but so far no luck.

I’m just a simple country videographer - all this color-correction stuff isn’t in my native skill set.  See what you can do and educate us all!  Fame awaits (in ot her words, I’ll post the names of the folks that come closest.)

Thanks in advance!

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That’s a tough one!

http://homepage.mac.com/duke13/.Pictures/Piano_Fixed_ElDuque.jpg

Posted by .(JavaScript must be enabled to view this email address)  on  06/08  at  12:28 AM


Wow, that’s amazing! 

Care to share the secret recipe?  Please??

BAJ

Posted by .(JavaScript must be enabled to view this email address)  on  06/08  at  08:09 AM


I know how I would tackle it in After Effects CS5 (just tried it; worked very well): Place the piano footage in a composition. Add a Layer > New > Solid. For the color of the solid, eyedropper a white reference in the shot (such a blank area of the sheet music). Then set the Blending Mode for this solid layer to Divide (new in CS5). Adjust the Opacity of this solid to adjust the depth of color cast removal. Alternatively, re-open the Layer > Solid Settings and tweak the color (such as by eyedroppering the keys - although I found that result made the image too cold).

good luck -
Chris

Posted by Chris Meyer  on  06/08  at  09:31 AM


Not sure if I got it as good as that, but you can see what I did here -

http://www.100acrefilms.com/guest/corrected_image1.jpg

I only had about 10 minutes to work on it, so it’s not perfect…but it’s a start.

You can download the project file to see the settings I used here…

http://www.100acrefilms.com/guest/CC_files.zip

I’ll leave it up for a few days for you.

Good luck!

Posted by .(JavaScript must be enabled to view this email address)  on  06/08  at  09:34 AM


I used Photoshop for mine.  I did a lot of tweaking, mostly with the individual color levels.  I removed a almost all of the yellow in the highs, and tweaked the blue and magenta to achieve a better balance.  It’s tough with all of the artifacts especially in the piano.  There is also a lot of blocking in the sheet music that I didn’t really touch but Eric did a better job with that.  Chris’ suggestion is very good, but it’s not very fair since he’s like the Adobe Jesus.

Posted by .(JavaScript must be enabled to view this email address)  on  06/08  at  03:25 PM


Chris, the AE approach sounds like a good one, but I forgot to mention - the shot is just a bit short of 1.5 hours long!  Rendering might be an issue, huh?  Once I get this project done, though, I will try it, just to see how the rendering time would be in 64-bit AE.

Posted by .(JavaScript must be enabled to view this email address)  on  06/08  at  06:52 PM


Hey - I just made this one attempt - I made a light blue color matte and put it on the track above the shot and set the blend mode to overlay - to me it looked like the window could be the same color as the stained glass one in the wide shot so the light blue spill might work(?) - Flickr crunches it kind of grainy - so - like I say this was - literally less than 2 minutes of work - but maybe it could help get you to where you want to get. Best wishes.

http://www.flickr.com/photos/50973833@N04/4684455591/

Posted by Jim Hines  on  06/09  at  05:47 AM


Oh I meant to add - alternatively - you might try the ramp effect on a piece of black video - with maybe a reddish on top and a light blue on the bottom - or - ?

[Color mattes and black video can be found in the new item button.]

Posted by Jim Hines  on  06/09  at  06:08 AM


Thought I’d take a crack at this for fun:

http://i666.photobucket.com/albums/vv28/perroneford/Piano_PTF.png

Posted by .(JavaScript must be enabled to view this email address)  on  06/19  at  09:48 PM


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