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I'm trying to convert a bunch of company logos to one single color (not just black and white). It's for a website I'm working on, for the "We support those products" type of thing.

Here's what I'm starting with:

enter image description here

What I did so far:

  1. Desaturate via Image -> Adjustments -> Desaturate
  2. Convert to grayscale via Image -> Mode -> Grayscale
  3. Convert to Monotone via Image -> Mode -> Duotone, then select Monotone and my color
  4. Make the background transparent with the magic wand tool

Here's where I'm at now:

enter image description here

The thing that I'm not happy about is that there are still multiple shades of blue there. I want it to be just one single color on transparent background. Just one shade of blue (or whatever color I pick).

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there's no need to desaturate before switching to grayscale mode, that's what will happen anyway. –  Vincent Dec 10 '13 at 13:16
6  
I'd first ask those brands/companies if they can supply monochrome versions of their logos, preferably in a vector format to avoid quality loss. Also, professionally created brands/CIs may use specially designed monochrome versions that vary not only in colour. –  TehMacDawg Dec 10 '13 at 13:42

2 Answers 2

up vote 5 down vote accepted

Add a 'Threshold' adjustment layer on top. You'll find it in he layers palette:

location of threshold in th elayers palette

This will cause you to lose all anti-aliasing, though, for the layer reduces all variance and allows only white and your chosen monotone colour.

edit:

If you want to keep the anti-aliasing and don't mind fine-tuning settings for each image, you'd be better off with a curves layer instead. I had some succes with your example using a curve like this one:

curves layer settings

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Thanks for the follow up. As I said, the threshold does the trick in the current situation. But maybe I'll need to employ the fine tuning in the future, or it helps someone who finds this. –  Alexander Rechsteiner Dec 10 '13 at 14:01

The fastes method (which may even be scriptable for batch conversion) I can think of to make a simple logo monochrome is using the bucket fill tool:

  1. Select background by color.
  2. Make background transparent.
  3. Invert selection:

    enter image description here

  4. Fill with desired color:

    enter image description here

Better results may be obtained by tracing the image to vector and then apply one single object color.

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