changing colour

If i have an image that is 100% white or black i don't seem to get much joy out of the channel mixer or hue\saturation.

what is the best way to change this colour?

be sure to set the mode of the picture to e.g. RBG and don't forget to check the colorize box with hue/saturation

it is RGB and colorize has no effect.

Try it yourself.
draw a box and fill it with white.
Now try and change that white to a shade of red without using the paintbrush or fill bucket again.
None of the usual colour adjusting options work unless you use gradient map, but it is not a very elegant way of doing things.

ah bollocks,
you were right.
colorize does work, i just wasn't playing around with the lightness feature.

Nothing changes until you play with that slider

cheers

okay then,
help me with this similar problem.

Lets say i have one square that is a shade of blue and one square a shade of red.
what is the best technique to make the blue square exactly the shade of red.

Ahhhh, another easy one.....

Sample the red with your eyedropper. This will place the red as your foreground color.

Select the blue square with your Marquee tool. Zoom in if necessary to get complete accuracy.

Option-Delete or (windows—ALT-Backspace) to fill the selected area with the red color you sampled.

Experiment and read the online help files for other methods....there are many.

but what about more complicated shapes.
The example i gave you was just so you understand the process i was after.
obviously an easy shape like a square is easy to mask and make the same colour.
But what when the shapes are more complicated.
it is a hassle to make a path around these shapes and i was hoping there would be an easier way.
Using hue and saturation is a lot easier but i just wish there was a way to use the eye dropper tool within this dialog box and select the colour you want it to be.

i am placing an image here to show the difference.
I hope it works as i have never tried this before.






Anyway, as you can see, using Hue and saturation gives much cleaner results then creating a selection round the object, but it is still not exactly the same as the target colour.

No picture was shown and i look at where the picture is and its from your harddrive. I would suggest to upload it to a server. Then you can link it from there.

If you are wanting to change a color to make one shape the same color just use the eye droper. Thats it. No masking is involved. Or copy your layer.

Damn,
never posted an image on a forum before
didn't think you had to have it online.
I can't upload at work so i will have to do without it.


Anyway, i don't seem to be explaining myself very well.
I have just seen this on one of the past threads and it is nearly what i am looking for

http://www.teamphotoshop.com/forum/vbforum/showthread.php?s=&threadid=3786&highlight=replace+color


Now i have used this technique before but imagine you wanted that inflatable to be the same as your corporate colour.
You can play around with the hue and sat, but it would take a while to get the sample even close to the exact colour.
It would be so much easier if i could just take the eye dropper tool and click on our companies logo and get the exact colour that i need.
Or at least get the option where i can type in RGB values to get the colour i need.



Does this make any more sense now?

Try to think of color as seperate to tone If a colour is 100% black then it can't change with hue/saturation, which only changes the colour component. The Lightness slider will of course affect the tone.

Now to take your second question is there a way to infuse all another object (which may for example be semi-transparent with varying tones and shades) with a color sampled from somewhere else? The answer as usual with Photoshop is yes.

First take the sample from a single colour on your first object.

Now make a very rough selection of the object you want to change including all the pixels which are included or semi-transparent.

Now Edit/fill. Change the mode of the fill to "Colour" and the opacity to 100%. The pixels withon your selection will be altered to the new color without affecting their tone.