If the text is in four black - in the Cyan, Meganta, Yellow, and Black channel also known as registeration black. On Web press it is hard to run small registerated black text. To fix this you can take the color out of the other three channels.
one way to prevent four black text is creating your document in CMYK and using 100% Black.
PLEASE DON’T CREATE YOUR LAYOUT IN RGB.
Fixing 4-color black text in an ad in Photoshop with ads with no background
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Step One
Select the black text with the rectangular marquee tool

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Step Two
Make sure the background color is white

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Step 3
Copy the Selected Black Text in the CMYK Channel

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Step 4
Go to the Cyan Magenta Yellow Channels and delete the Selected text, and replace it with the no color background.

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Step 5
Paste the Selected Black Text in the Black Channel. The only channel that should have the black text is the Black Channel.

Tutorial Download
Feel free to download this tutorial for your own personal use. Page1Printers tutorials make a great cubicle wallpaper!
color-correction-for-black-text.pdf (5.97 mb)