|
|||||||||
|
Thread Tools | Search this Thread |
August 19th, 2005, 05:34 PM | #1 |
Regular Crew
Join Date: Aug 2005
Location: Los Angeles
Posts: 67
|
Black Stretch/Press in Final Cut HD
I recently shot some footage with my camera settings set to "Stretch" the blacks. This means it lightens the black areas of the picture to capture more detail. After seeing the footage I now regret the decision to shoot this way because it's giving me a very "video" look instead the film look I was after. The footage is noisy to begin with because I shot in low light and had to bump up the gain on an XL2. Stretching the blacks, rather than pressing them, is making the noise more visible.
So, my question is, how do we press (or compress) the blacks in Final Cut HD? And is it a good idea to do this in post or should I have done it when shooting? TIA |
August 19th, 2005, 06:18 PM | #2 |
Major Player
Join Date: Feb 2005
Location: Portland, OR
Posts: 273
|
Javier,
You'll want to use the 3-way Color Corrector filter and the waveform monitor in Final Cut. Apply the filter, adjust the blacks with the left slider until you are happy and check the levels on the waveform (blacks should be at 0% if you want them to be true black). The 3-way Color Corrector should not add noise (it's theoretically YCbCr native), and if you are crushing blacks, it may reduce some noise (remapping all these pixels to black). Make sure you use the "paste attributes" command for similar clips so you don't have to adjust every one. Some DPs shoot with blacks high knowing someone will crush them in post later. The idea, like you said, is to make sure the detail is there. It's an OK practice, but if you can manage to shoot correct blacks while shooting that's always more efficient, and costs you less if you have to pay an editor/colorist. |
August 19th, 2005, 10:51 PM | #3 |
Inner Circle
Join Date: Jun 2003
Location: Toronto, Canada
Posts: 4,750
|
1- Anyone try Nattress' DVNR from his filter set 1?
http://www.nattress.com/set1.htm There's a functional demo. 2- The 3-way CC does not add noise, but can make it more visible. When you "stretch" colors (i.e. make blacks blacker, or make whites brighter; stretch is my term... nothing to do with XL2 settings) it will make noise more visible. Try dropping the gamma. 3- If you have Nattress' film effects, black diffusion may also work well? |
August 21st, 2005, 01:40 PM | #4 | |
Regular Crew
Join Date: Aug 2005
Location: Los Angeles
Posts: 67
|
Thank you Zach, we're going to try this after we've made a rough cut.
Quote:
The whites were shot with a low knee setting which helps to keep them from blowing out. I don't need to adjust them but I can see how brightening them would add noise. |
|
August 21st, 2005, 04:16 PM | #5 |
RED Problem Solver
Join Date: Sep 2003
Location: Ottawa, Canada
Posts: 1,365
|
Try the G S-Gamma filters in Film Effects. They do wonderfully nice crushing of blacks. Also, play with the curves control, and adding diffusion can disuise noise quite nicely.
Graeme
__________________
www.nattress.com - filters for FCP |
August 21st, 2005, 07:39 PM | #6 | |
Inner Circle
Join Date: Jun 2003
Location: Toronto, Canada
Posts: 4,750
|
Quote:
2- Another option: Create a new sequence. Drag your edited sequence in there (nesting). Do it again onto another track. On the upper track, set the compositing mode to overlay or hard light. This gives results like S-shaped gamma curves. Apply gaussian blur to the upper track. This does diffusion. This affects the realism of your footage, but artistically you may find it looks good. Just giving you differerent options here... there's many different ways to do this. Graeme Nattress has watermarked and fully-functional demos for his excellent filters, which you can play around with. Film effects is very useful for making your images look better. |
|
August 21st, 2005, 10:24 PM | #7 |
Regular Crew
Join Date: Aug 2005
Location: Los Angeles
Posts: 67
|
Thank you for your advice
I do not have any money to buy a plug-in. As for adding diffusion, I shot with a Black Pro Mist 1/2 filter on the lens. I don't want to soften the image anymore than I already have.
I'm going to do what Zach Mull suggested and I'll post later about the results. |
August 21st, 2005, 11:05 PM | #8 |
Major Player
Join Date: Feb 2005
Location: Portland, OR
Posts: 273
|
Glenn,
What is the difference between clipping and crushing blacks? I've never heard this distinction before. |
September 1st, 2005, 06:24 PM | #9 |
Regular Crew
Join Date: Aug 2005
Location: Los Angeles
Posts: 67
|
Thank you.
We used Zach's method and everything looks great. The only thing we did differently was to adjust the blacks by using numbers rather than the slider. For example, each shot was adjusted to -8, -15, -22, etc... The process was very quick once we figured out what we were doing, and the resulting image quality is 100% better. Noise decreased immensely. It had the side effect of enhancing some of the colors as well.
After this experience, I'm convinced the proper method is to shoot with the blacks stretched and then crush them in post. If I had crushed them in camera, we would not have had as much control during editing. |
September 1st, 2005, 06:39 PM | #10 | |
Inner Circle
Join Date: Jun 2003
Location: Toronto, Canada
Posts: 4,750
|
Quote:
What FCP's 3-way CC does: Clips blacks. What Nattress' filters can do: They can emulate film's gamma response (not sure if that's the correct term), which does an s-shaped gamma curve. In the shadow areas, it kind of compresses them without clipping (like how there's smooth knees for audio compressors to prevent clipping). |
|
| ||||||
|
|