Photoshop: Making an image black only

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  • Updated 1 year ago
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I'm preparing a t shirt design that will be printed on a t-shirt in black ink only. I want to make sure the design I submit is only in black, no greyscale, etc. (and on a transparent background). All is well so far except that I'm trying to convert colored partner logos with transparent backgrounds to black only. All forums Q's I've found are about black AND white, or greyscale, or turning black into colors. How do I simply turn an already transparent-background layer/image to make all color be pure black
I'm working in Photoshop CS4 Extended
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Alexis

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  • frustrated

Posted 1 year ago

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David, Official Rep

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Howdy Alexis,

You could convert your image to grayscale and then click Image > Adjustments > Posterize and set the Levels to 2.  This means you'll have two "levels" of grayscale -- white and black.  That should take care of you.

Thanks,
David
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Alexis

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Hi David,
I followed your steps just now: I converted it to grayscale (via Image > Mode > Grayscale). When I opened the Posterize field, it had the Adjustments set at 4. Moving it to 2 didn't change the grayscale... any clue for what next?
Thanks,
Alexis
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David, Official Rep

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Hi Alexis,

When you moved the slider to 2, you have more than just black and white pixels?  Try click Export > Save for Web and setting it to a GIF.  It should show you that you ONLY have two colors -- black and white.  Is that not what you're seeing?

Thanks,
David
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Alexis

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Hi David,
I followed your steps just now: I converted it to grayscale (via Image > Mode > Grayscale). When I opened the Posterize field, it had the Adjustments set at 4. Moving it to 2 didn't change the grayscale... any clue for what next?
Thanks,
Alexis
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Jeffrey Tranberry, Sr. Product Manager, Digital Imaging

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You could do Image > Mode > Indexed Color... and set the palette to Forced and Black and White, leave "Transparency" checked
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Alexis

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Could you explain how to access the palette options? I've set it to Indexed Color but can't figure out how to get further.
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Jeffrey Tranberry, Sr. Product Manager, Digital Imaging

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