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Mike Chaney's Tech Corner > Mike's Software > Qimage Ultimate > Video Sel Color
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Author Topic: Video Sel Color  (Read 10476 times)
Jeff
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« on: February 02, 2011, 11:24:28 AM »
I am still messing about trying to get a handle on Sel Color.

eg. if I look up a color chart and say would like to change a dark blue sky to "baby blue" #89cffo  rgb 137 207 240 what would I enter in the sel color tab.''

I have tried the blue line at 1.37 2.07 and 2.40 this changes the blue but not to "baby Blue"

Obviously it is not that simple. Smiley

jeff
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Fred A
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« Reply #1 on: February 02, 2011, 11:34:16 AM »
Jeff,
Can I have the image?

Fred
wathree.ssz@verizon.net
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Terry-M
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« Reply #2 on: February 02, 2011, 01:35:45 PM »
Hi Jeff,
To get a lighter blue you need to increase the RGB values but some "trial & error" is initially required  Shocked
See attached.
Original blue was 70,97,148
with Sel Col as shown it went to 132,152,180
Terry
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admin
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« Reply #3 on: February 02, 2011, 02:07:34 PM »
Jeff,

Keep in mind that you are supplying weighting factors for the RGB channels and that your weights apply to the color primaries.  What this means is that you are taking the original RGB values and multiplying them by the weights you enter to get the result.  On top of that, the weights you enter only apply to that primary: so if you enter weights for the "B" row, those weights will be applied to PURE blue hues where the blue channel is the highest and the red and green channels are lower (and equal).  As you move away from pure blue, your change has less influence.

Simply put, Sel Clr isn't like a map where you can point to a spot on the RGB map and say "go here".  It's more like operating a canoe where you are adjusting which side and how hard you paddle.  You make a change and see where you are headed after the change.  Smiley

Mike
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Terry-M
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« Reply #4 on: February 02, 2011, 02:37:37 PM »
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It's more like operating a canoe where you are adjusting which side and how hard you paddle.  You make a change and see where you are headed after the change.
That's much better than me saying trial & error  Roll Eyes
Terry
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Jeff
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« Reply #5 on: February 03, 2011, 08:52:12 AM »
Thanks to all.

I will digest the suggestions and comments and have another session with sel C later (out most of today)

Fred, you have seen the image I am experimenting with, I will look it up and let you have a copy to fiddle with (again later)

It has a darkish blue sky which always - just this one image - prints darker still both on my R1900 and on a Lab Print,  so,  after the video I was/am seeing what I can do about it, more or less an educational thing to get the hang of sel C.

Jeff
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Fred A
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« Reply #6 on: February 03, 2011, 09:57:02 AM »
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Fred, you have seen the image I am experimenting with, I will look it up and let you have a copy to fiddle with (again later)

Jeff,
If that's the picture with the river and the kayaks, I have it.
I love that picture. That gets saved.

It's Image0035.orf
That's the one I have and it doesn't print dark here.
Let me know if I have the right one. I will email the two filters that I have associated with that image.
Then simply place the two filters in the same folder with the 0035.orf..  and print.

Fred
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Fred A
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« Reply #7 on: February 05, 2011, 07:36:42 PM »
Quote from: Terry-M on February 02, 2011, 01:35:45 PM
Hi Jeff,
To get a lighter blue you need to increase the RGB values but some "trial & error" is initially required  Shocked
See attached.
Original blue was 70,97,148
with Sel Col as shown it went to 132,152,180
Terry

To all!

Bear in mind that any revising of colors using Sel Clr will change the TONE or hue.  If you have used Tone targeted sharpening on the image, and use SEL CLR after the TTS, the selected Tones to be sharpened are likely or possibly no longer valid.
Please do Tone Targeted Sharpening after you finish adjusting any color in Sel Clr, and after you finish paddling the canoe.  Cool , as Mike says!

Fred
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