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easy way to do color substitution?

I'm trying to edit the colors used in a small image file and have no idea how to get started (Photoshop 7.0).  Although the file looks fairly simple (white background + four prominent colors used in text and in graphics), I tried swapping colors with a much simpler program (Snagit), and it turns out there are subtle little shades of the four prominent colors. So I'm hoping for a way to select an existing color, select a color to replace it with, and have everything close to the existing shade get replaced with close parallels in the replacement shade (so things a little lighter in the original, get replaced with a slightly lighter shade of the new color).

I found the "Select" | "Color Range" tool that definitely supports the selection of one of my color ranges with a "fuzziness" slider, but no idea where to go after (or before?) that.  Sorry, but next to no skills in Photoshop.

Thanks for any specific sequences I might follow-
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ottenm
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ottenm
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1 Solution
 
crooksy88Commented:
In Photoshop try using Image > Adjustments > Replace colour.

Use the selection eyedropper to select the colour to change, use the fuzziness slider to select the range, then use the Hue, Sat and Lightness to define the replacement colour.
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ottenmAuthor Commented:
Thanks so much for helping crooksy88, this is very close to what I need.  The challenge I have now is picking the replacement color/color range.  Is there a way to use RGB values to help identify the replacement color?  The "Replace a Color" dialog only has Hue, Saturation, and Lightness sliders which definitely help, but I'm finding it difficult to use them to dial up a target color I have identified with RGB values.

Along the right hand side of the gui there are some panels (Navigator, Color, History, Layers), and the Color tab shows RGB values, and they even update when I select a color with the eyedropper, but the sliders are locked.  Am I missing some way to select the original color with the eyedropper, and then identify the transformed color using this Color panel?

Many apologies if there are obvious answers to my question(s).
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crooksy88Commented:
In the replacement area of the Replace colour panel, if you click on the colour swatch a more definable colour picker should pop up.
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ottenmAuthor Commented:
More apologies, but I am definitely missing something.

Attached is a snapshot of what comes up when I follow: Image > Adjustments > Replace colour, along with the "Color" panel over on the right.  I have selected the orange X in "Experts Exchange", maxed out the fuzziness so the entire 'X' is selected, and then adjusted the Hue to set the transformed color to be green.  

All this updated the RGB values in the Color panel, but those sliders won't move using the mouse.  I've tried clicking where it says "Sample" on the left, but nothing opens..
snap.jpg
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crooksy88Commented:
Ah! Clicking on the sample swatch must be a new function in CS3.

Unfortunately it looks like you can only define this colour using the HSB sliders.
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ottenmAuthor Commented:
Bummer!
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