What is the feature in photo editing where only one color is picked up and

LAURAT

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Depending on the program, it might be something like "monochromatic"
 
the rest is in black and white? For example:
If i took a picture in black and white of a rose on a table and only wanted the red of the petals to come out in color but the rest to stay black and white.
i know this might be a lot to ask but do you by any chance know what it is called in aperture? because i just got a new mac and i dont know how to find any of the features =/
 
Hey I can help you here. First of all, don't ever let anyone tell you aperture isn't amazing. Sure it's not photoshop, but at least half of what most people need done with photo editing can be done on it. Yay another aperture user. *high five*

Secondly if you're not yet familiar with how to do pretty much everything in aperture, head here http://www.apple.com/aperture/tutorials/
This link alone will bring you up to speed with gosh darn near EVERYTHING it can do.

Ok this is how you can go about doing it. I'm sure there are more ways, but this is how I would do it quickly and painlessly: Dodge and burn option or desaturation channels.

Desaturation:
On your 3 tabs click the third (adjustments). Near the bottom of that window is a set of color adjustments. Say you want to keep all of your reds and kill all the other colors. You would leave the red alone, click on all of the other colors and drag their saturation tab to the far left. That's your run of the mill desaturation, which is also great for killing a color in a picture that really doesn't need to be there, like band of yellow color on a platinum wedding band.

Dodge and burn:
This is really just another way to desaturate, but you do it with the Dodge and Burn window. So this is what you do.
Image > Edit With > Dodge and Burn

This opens up a window (you can only undo your last move 1 time, keep that in mind while you're working), on the upper left side of the window you want to click on the Dodge (lighten) tool - which by the way lightens an area, play around with this window, it's one of the best parts of aperture. So yah click the Dodge(lighten) tool to bring down the drop down menu, then click desaturate. This will do selective desaturation. The strength slider lets you adjust how much per stroke over an area will desaturate. When I know I want to suck out color from a large area, I just max strength, make the brush large and have at it.

These two techniques will do what you need, without the use of another program.

For your flower example, the fastest way to do it would be to use the color sliders on the adjustment tab and desaturate all the colors but the red and pinks, maybe even the purples. Pink = light red, Red = main color of petal, Purple = shadowy areas. So killing every other color channel will make the petals stick out and the rest dark.

Have fun, and remember check out the tutorials on apple's site. After an hour or two of reading/watching you'll be an aperture master. Have fun, shoot me an email if you have any other questions about aperture, I know my way around the program pretty well :D

I took this a few days ago http://PracticallyPrudent.deviantart.com/art/The-lady-s-gift-113249786
All done in aperture. It is a white gold band and pink gems (my lady's vday gift this year).
 
Hey I can help you here. First of all, don't ever let anyone tell you aperture isn't amazing. Sure it's not photoshop, but at least half of what most people need done with photo editing can be done on it. Yay another aperture user. *high five*

Secondly if you're not yet familiar with how to do pretty much everything in aperture, head here http://www.apple.com/aperture/tutorials/
This link alone will bring you up to speed with gosh darn near EVERYTHING it can do.

Ok this is how you can go about doing it. I'm sure there are more ways, but this is how I would do it quickly and painlessly: Dodge and burn option or desaturation channels.

Desaturation:
On your 3 tabs click the third (adjustments). Near the bottom of that window is a set of color adjustments. Say you want to keep all of your reds and kill all the other colors. You would leave the red alone, click on all of the other colors and drag their saturation tab to the far left. That's your run of the mill desaturation, which is also great for killing a color in a picture that really doesn't need to be there, like band of yellow color on a platinum wedding band.

Dodge and burn:
This is really just another way to desaturate, but you do it with the Dodge and Burn window. So this is what you do.
Image > Edit With > Dodge and Burn

This opens up a window (you can only undo your last move 1 time, keep that in mind while you're working), on the upper left side of the window you want to click on the Dodge (lighten) tool - which by the way lightens an area, play around with this window, it's one of the best parts of aperture. So yah click the Dodge(lighten) tool to bring down the drop down menu, then click desaturate. This will do selective desaturation. The strength slider lets you adjust how much per stroke over an area will desaturate. When I know I want to suck out color from a large area, I just max strength, make the brush large and have at it.

These two techniques will do what you need, without the use of another program.

For your flower example, the fastest way to do it would be to use the color sliders on the adjustment tab and desaturate all the colors but the red and pinks, maybe even the purples. Pink = light red, Red = main color of petal, Purple = shadowy areas. So killing every other color channel will make the petals stick out and the rest dark.

Have fun, and remember check out the tutorials on apple's site. After an hour or two of reading/watching you'll be an aperture master. Have fun, shoot me an email if you have any other questions about aperture, I know my way around the program pretty well :D

I took this a few days ago http://PracticallyPrudent.deviantart.com/art/The-lady-s-gift-113249786
All done in aperture. It is a white gold band and pink gems (my lady's vday gift this year).
 
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