Help please: how to change colour in this way ...

Surely this must be possible, but I am not a very advanced user of PS
and can't work out how. Can anyone please advise:
I have a bitmap file of an object which is green in colour, pale at
one end and getting darker at the other, to simulate shadow. I want to
change it to orange, an orange which must match exactly the colour of
another bitmap file. How do I do this and keep the gradation of light
to dark across the image? The gradation doesn't have to be exactly the
same as the original.
Clearly the pipette and paint bucket won't do here!
Thank you in advance.
Martin

Martin S.

Re: Help please: how to change colour in this way ...

Convert to LAB. Use a curves layer to change the A and B channels, and a
layer mask and layer blending to convert only the area of the item you
want to change. It's not easy to describe but it's not as difficult as
all that. See Dan Marguiles' book 'Photoshop LAB Color.' It has a whole
section about this very topic.
Another cruder technique would be to convert to LAB, select the A
channel, hold down shift and select the B channel, and then paint your
new color onto A+B in the area of the object. (You can probably use the
L channel to help you make a mask, if you need to.)
LAB: Once you try it, you never go back. :-)


Usenet@mile23.c0m (Paul Mitchum)

Re: Help please: how to change colour in this way ...

the match color option is another method that might work
you could just select the object and make a new gradient in the orange color
sampled from image1


KatWoman

Re: Help please: how to change colour in this way ...

I did - but it wasn't effective. I'll look through the advive and see
how I get on. Thanks.
M.


Martin S.

Re: Help please: how to change colour in this way ...

In article <md46h2lkg0v9ifsco17s1eiov7rl6dtb69@4ax.com>,
Yes.
Step 1: Sample the color.
Step 2: Use the Edit->Fill command.
Step 3: In the Fill dialog, set the Mode: to Color and fill with the
foreground color.
--
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all at http://www.xeromag.com/franklin.html
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Tacit

Re: Help please: how to change colour in this way ...

4ax.com:
Have you tried the color replacement tool?
--
------------------------------------------------------------------------
Learning is not attained by chance, it must be sought for with ardor and
attended to with diligence.
------------------------------------------------------------------------


Kingdom

Re: Help please: how to change colour in this way ...

...
Here's one way.
1) convert your image to RGB
2) switch to the orange image whose color you want to match, and alt-click
the appropriate color
3) add an orange color layer above your background image, with the mode set
to "color"
4) if necessary, paint black on the layer mask to retain any areas of
original color.
5) convert back to indexed mode.
If you have an older version of Photoshop, you can get the same effect by
creating a new layer and filling it with orange. Then you have the option
of painting orange on selected areas only, or using the eraser tool to
recover the original color of any layers.
If the image has areas of complex color, such as colored objects overlapping
the gradient, the layer mask method will be a lot of work. I don't think
this is of interest to you for this specific case. If it is, there are ways
to use the Blend If sliders to change only the green areas of the original
image.
--
Mike Russell
www.curvemeister.com/forum/


Mike Russell

Re: Help please: how to change colour in this way ...

I should have said that the best I can manage so far is to open
hue/saturation, move the hue slider to the far left, then the
saturation slider towards the far right, which can give me an orange
of sorts; I can then adjust this with the RGB colour control (Ctrl+B).
This doesn't seem very elegant though and means quite a lot of time
spent matching the new colour to the original. Is there a way to use
the pipette to sample the colour and transfer it to the new bitmap
without losing the shading detail?
Thanks again.


Martin S.

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