How do you highlight just one color in a picture with Photoshop?

Question

For example, if you had an all-color picture of a man in a blue shirt, and you wanted to leave his shirt that blue but make the rest of the color black and white...

Answer 1

the easy way is to use magic wand to select the shirt, invert the selection then desaturate the picture
you could also use the lasso tool to select the shirt, invert the selection then desaturate the picture
if the shirt is the only blue colour in the entire picture, you could play with the levels by turning up the blue channel and setting the red and green channels to zero
play around until you get the desired effect

Answer 2

Adobe Photoshop-> Select-> Color Range-> Sampled Colors

Answer 3

It may not be the easiest way, but I would use the pen tool, and "pen out" or trace around the shirt. This gives you control on what you want to select and doesn't bring in extra pixels to deal with later.
Click on the Paths palette, make a work path, and select the work path. (make it active)
Then, while the shirt outline is still active, you would click on the layers palette and "jump" the selection of the shirt (control+J on PC; command+J on a Mac) to a new layer on top of the photgraph. Then you chould change the bottom layer to black and white but keep the shirt as the original on top.
I'm not a big fan of the magic wand-I do everything with my pen tool; however, you can use it if you choose to go that route.
Good Luck!

Answer 4

take the lasso tool and circle the area you want to remain in color. i find that the magnetic lasso usually works best in this case. then click "select" followed by "inverse." this will select the area around the part you originally selected. then when you remove the color, the part you originally selected will remain in color.

you could also try using the magic wand. when you use this tool, you click on the one color you want to keep. this selects all areas in the image with that color. then you do the whole inverse selection thing and you get the same effect. the only problem with this is sometimes the object is not one solid color and therefore, it will not select the whole item.

Answer 5

you can use the magic wand, but remember his shirt is more than just one color, it is several different blues.. So doing what you say can be very difficult