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Ive got a bunch of logos i want to display on a 'press' page, the logos all have different color schemes, which clash so i want to make all the logos black and white, no greyscale, just 2 colours, black and white.

Ive tried in Photoshop to set the color pallet to greyscale and then up the contrast, but i still get allot of greys in the logos, any idea hows best to achieve this.

Id like to do something similar to this example were the logo is completely flattened, see there is no tonal effect on the letters as there is on the color version.

Just to be clear all the logos, are raster, rather than vector so they cant just be put into illustrator and changed.

Google colour logo Google Black

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Desaturate the image (to turn into grayscale) then use the levels tool to push it into the black. –  DA01 Jun 19 '13 at 15:09
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up vote 5 down vote accepted

Use a Hue/Saturation adjustment layer and turn the saturation down to zero. You can then turn the lightness down as needed to make it black.

Edit: Sorry I assumed you had a transparent background. Instead, use the threshhold adjustment layer. It will turn your image pure black/white

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Thanks but i couldnt get this to work just seemed to end up with a dark grey, greyscaled image - imgur.com/L0urRiP - any ideas ? –  sam Jun 19 '13 at 13:57
    
@sam Updated answer –  John Jun 19 '13 at 14:29
    
How can you then get rid of the white background? When applying my color overlay, it is applying to the white background as well. –  user1676691 Jun 20 '13 at 14:40
    
There are several techniques, but here is a good/quick way especially because you're using black and white. Select all ctrl+a of your b/w logo image and copy ctrl+c. Create a layer mask and alt+click on your layer mask icon in the layers panel. This will put you in the layer mask special editing mode (not sure it's official name) - now paste in place sft+ctrl+v. Invert it (flipping the colors) with ctrl+i and exit the layer mask edit mode. Let me know how you go... –  John Jun 20 '13 at 16:24
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You can also use Blending Modes > Color Overlay on all the layers so you can make the logos any color you wish.

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