Partial Colour Saturation
Posted: Thu Apr 23, 2009 2:21 am
Firstly, let me say how glad I am to find a forum of folks using and manipulating VS. I've found it to be a perfect middle ground program for my rather modest PC. Through here, I've already successfully learned how to create a "censor" blur - thank you!
There are two other effects that I've been trying to figure out how to accomplish with no results thus far. Both of them involve a partially colored video.
Most of my footage is of public transit vehicles: buses, trams, trains, trolleys, etc. Nearly all are shot "handheld" and most are zoomed at some point within the video, so the backdrop is almost never static.
What I would like to try would be an occasional "special effect" in which only a portion of the image is colored.
In the first, I'd like a result where only part of the color spectrum is in color with the rest being in black in white. Thus, the sky may be blue or the grass may be green, but anything that is not a shade of the selected colour will mute out to monochrome black and white. Unfortunately, only the Brightness-Contrast filter allows manipulation of the color channels - the saturation filter is only set for the master channel. Could I possibly split the clip into three overlaid tracks and manipulate the brightness of the channels so that only the one channel shows, then desaturate two of them with the other remaining in color, and then reassemble the tracks in VS?
The second would be far more complex, and is probably beyond the realm of VS. Would it be realistically possible to take the moving bus/tram etc., and manipulate the image where only the bus is in color and has a black and white backdrop image? I'm doubting it, expecting the only way to load each individual frame in a paint program and draw a mask around the part I wish to remain in color, invert it, and then desaturate the surrounding area. At 30 frames per second, that would be major undertaking. Just thought I'd ask!
Many thanks!
There are two other effects that I've been trying to figure out how to accomplish with no results thus far. Both of them involve a partially colored video.
Most of my footage is of public transit vehicles: buses, trams, trains, trolleys, etc. Nearly all are shot "handheld" and most are zoomed at some point within the video, so the backdrop is almost never static.
What I would like to try would be an occasional "special effect" in which only a portion of the image is colored.
In the first, I'd like a result where only part of the color spectrum is in color with the rest being in black in white. Thus, the sky may be blue or the grass may be green, but anything that is not a shade of the selected colour will mute out to monochrome black and white. Unfortunately, only the Brightness-Contrast filter allows manipulation of the color channels - the saturation filter is only set for the master channel. Could I possibly split the clip into three overlaid tracks and manipulate the brightness of the channels so that only the one channel shows, then desaturate two of them with the other remaining in color, and then reassemble the tracks in VS?
The second would be far more complex, and is probably beyond the realm of VS. Would it be realistically possible to take the moving bus/tram etc., and manipulate the image where only the bus is in color and has a black and white backdrop image? I'm doubting it, expecting the only way to load each individual frame in a paint program and draw a mask around the part I wish to remain in color, invert it, and then desaturate the surrounding area. At 30 frames per second, that would be major undertaking. Just thought I'd ask!
Many thanks!
